hadoop Constants 源码
haddop Constants 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Constants.java
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.fs.s3a;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.Options;
import org.apache.hadoop.security.ssl.DelegatingSSLSocketFactory;
import java.util.concurrent.TimeUnit;
/**
* Constants used with the {@link S3AFileSystem}.
*
* Some of the strings are marked as {@code Unstable}. This means
* that they may be Unsupported in future; at which point they will be marked
* as deprecated and simply ignored.
*
* All S3Guard related constants are marked as Deprecated and either ignored (ddb config)
* or rejected (setting the metastore to anything other than the null store)
*/
@InterfaceAudience.Public
@InterfaceStability.Evolving
public final class Constants {
private Constants() {
}
/**
* default hadoop temp dir on local system: {@value}.
*/
public static final String HADOOP_TMP_DIR = "hadoop.tmp.dir";
/** The minimum multipart size which S3 supports. */
public static final int MULTIPART_MIN_SIZE = 5 * 1024 * 1024;
// s3 access key
public static final String ACCESS_KEY = "fs.s3a.access.key";
// s3 secret key
public static final String SECRET_KEY = "fs.s3a.secret.key";
// aws credentials providers
public static final String AWS_CREDENTIALS_PROVIDER =
"fs.s3a.aws.credentials.provider";
/**
* Extra set of security credentials which will be prepended to that
* set in {@code "hadoop.security.credential.provider.path"}.
* This extra option allows for per-bucket overrides.
*/
public static final String S3A_SECURITY_CREDENTIAL_PROVIDER_PATH =
"fs.s3a.security.credential.provider.path";
/**
* session token for when using TemporaryAWSCredentialsProvider: : {@value}.
*/
public static final String SESSION_TOKEN = "fs.s3a.session.token";
/**
* ARN of AWS Role to request: {@value}.
*/
public static final String ASSUMED_ROLE_ARN =
"fs.s3a.assumed.role.arn";
/**
* Session name for the assumed role, must be valid characters according
* to the AWS APIs: {@value}.
* If not set, one is generated from the current Hadoop/Kerberos username.
*/
public static final String ASSUMED_ROLE_SESSION_NAME =
"fs.s3a.assumed.role.session.name";
/**
* Duration of assumed roles before a refresh is attempted.
*/
public static final String ASSUMED_ROLE_SESSION_DURATION =
"fs.s3a.assumed.role.session.duration";
/**
* Security Token Service Endpoint: {@value}.
* If unset, uses the default endpoint.
*/
public static final String ASSUMED_ROLE_STS_ENDPOINT =
"fs.s3a.assumed.role.sts.endpoint";
/**
* Default endpoint for session tokens: {@value}.
* This is the central STS endpoint which, for v3 signing, can
* issue STS tokens for any region.
*/
public static final String DEFAULT_ASSUMED_ROLE_STS_ENDPOINT = "";
/**
* Region for the STS endpoint; needed if the endpoint
* is set to anything other then the central one.: {@value}.
*/
public static final String ASSUMED_ROLE_STS_ENDPOINT_REGION =
"fs.s3a.assumed.role.sts.endpoint.region";
/**
* Default value for the STS endpoint region; needed for
* v4 signing: {@value}.
*/
public static final String ASSUMED_ROLE_STS_ENDPOINT_REGION_DEFAULT = "";
/**
* Default duration of an assumed role: {@value}.
*/
public static final String ASSUMED_ROLE_SESSION_DURATION_DEFAULT = "1h";
/**
* List of providers to authenticate for the assumed role: {@value}.
*/
public static final String ASSUMED_ROLE_CREDENTIALS_PROVIDER =
"fs.s3a.assumed.role.credentials.provider";
/**
* JSON policy containing the policy to apply to the role: {@value}.
* This is not used for delegation tokens, which generate the policy
* automatically, and restrict it to the S3 and KMS services
* needed.
*/
public static final String ASSUMED_ROLE_POLICY =
"fs.s3a.assumed.role.policy";
@SuppressWarnings("deprecation")
public static final String ASSUMED_ROLE_CREDENTIALS_DEFAULT =
SimpleAWSCredentialsProvider.NAME;
// the maximum number of tasks cached if all threads are already uploading
public static final String MAX_TOTAL_TASKS = "fs.s3a.max.total.tasks";
public static final int DEFAULT_MAX_TOTAL_TASKS = 32;
// number of simultaneous connections to s3
public static final String MAXIMUM_CONNECTIONS = "fs.s3a.connection.maximum";
public static final int DEFAULT_MAXIMUM_CONNECTIONS = 96;
// connect to s3 over ssl?
public static final String SECURE_CONNECTIONS =
"fs.s3a.connection.ssl.enabled";
public static final boolean DEFAULT_SECURE_CONNECTIONS = true;
/**
* Configuration option for S3 Requester Pays feature: {@value}.
*/
public static final String ALLOW_REQUESTER_PAYS = "fs.s3a.requester.pays.enabled";
/**
* Default configuration for {@value ALLOW_REQUESTER_PAYS}: {@value}.
*/
public static final boolean DEFAULT_ALLOW_REQUESTER_PAYS = false;
// use OpenSSL or JSEE for secure connections
public static final String SSL_CHANNEL_MODE = "fs.s3a.ssl.channel.mode";
public static final DelegatingSSLSocketFactory.SSLChannelMode
DEFAULT_SSL_CHANNEL_MODE =
DelegatingSSLSocketFactory.SSLChannelMode.Default_JSSE;
/**
* Endpoint. For v4 signing and/or better performance,
* this should be the specific endpoint of the region
* in which the bucket is hosted.
*/
public static final String ENDPOINT = "fs.s3a.endpoint";
/**
* Default value of s3 endpoint: {@value}.
* It tells the AWS client to work it out by asking the central
* endpoint where the bucket lives; caching that
* value in the client for the life of the process.
* <p>
* Note: previously this constant was defined as
* {@link #CENTRAL_ENDPOINT}, however the actual
* S3A client code used "" as the default when
* {@link #ENDPOINT} was unset.
* As core-default.xml also set the endpoint to "",
* the empty string has long been the <i>real</i>
* default value.
*/
public static final String DEFAULT_ENDPOINT = "";
/**
* The central endpoint :{@value}.
*/
public static final String CENTRAL_ENDPOINT = "s3.amazonaws.com";
//Enable path style access? Overrides default virtual hosting
public static final String PATH_STYLE_ACCESS = "fs.s3a.path.style.access";
//connect to s3 through a proxy server?
public static final String PROXY_HOST = "fs.s3a.proxy.host";
public static final String PROXY_PORT = "fs.s3a.proxy.port";
public static final String PROXY_USERNAME = "fs.s3a.proxy.username";
public static final String PROXY_PASSWORD = "fs.s3a.proxy.password";
public static final String PROXY_DOMAIN = "fs.s3a.proxy.domain";
public static final String PROXY_WORKSTATION = "fs.s3a.proxy.workstation";
/**
* Number of times the AWS client library should retry errors before
* escalating to the S3A code: {@value}.
*/
public static final String MAX_ERROR_RETRIES = "fs.s3a.attempts.maximum";
/**
* Default number of times the AWS client library should retry errors before
* escalating to the S3A code: {@value}.
*/
public static final int DEFAULT_MAX_ERROR_RETRIES = 10;
/**
* Experimental/Unstable feature: should the AWS client library retry
* throttle responses before escalating to the S3A code: {@value}.
*
* When set to false, the S3A connector sees all S3 throttle events,
* And so can update it counters and the metrics, and use its own retry
* policy.
* However, this may have adverse effects on some operations where the S3A
* code cannot retry as efficiently as the AWS client library.
*
* This only applies to S3 operations, not to DynamoDB or other services.
*/
@InterfaceStability.Unstable
public static final String EXPERIMENTAL_AWS_INTERNAL_THROTTLING =
"fs.s3a.experimental.aws.s3.throttling";
/**
* Default value of {@link #EXPERIMENTAL_AWS_INTERNAL_THROTTLING},
* value: {@value}.
*/
@InterfaceStability.Unstable
public static final boolean EXPERIMENTAL_AWS_INTERNAL_THROTTLING_DEFAULT =
true;
// seconds until we give up trying to establish a connection to s3
public static final String ESTABLISH_TIMEOUT =
"fs.s3a.connection.establish.timeout";
public static final int DEFAULT_ESTABLISH_TIMEOUT = 50000;
// seconds until we give up on a connection to s3
public static final String SOCKET_TIMEOUT = "fs.s3a.connection.timeout";
public static final int DEFAULT_SOCKET_TIMEOUT = 200000;
// milliseconds until a request is timed-out
public static final String REQUEST_TIMEOUT =
"fs.s3a.connection.request.timeout";
public static final int DEFAULT_REQUEST_TIMEOUT = 0;
// socket send buffer to be used in Amazon client
public static final String SOCKET_SEND_BUFFER = "fs.s3a.socket.send.buffer";
public static final int DEFAULT_SOCKET_SEND_BUFFER = 8 * 1024;
// socket send buffer to be used in Amazon client
public static final String SOCKET_RECV_BUFFER = "fs.s3a.socket.recv.buffer";
public static final int DEFAULT_SOCKET_RECV_BUFFER = 8 * 1024;
// number of records to get while paging through a directory listing
public static final String MAX_PAGING_KEYS = "fs.s3a.paging.maximum";
public static final int DEFAULT_MAX_PAGING_KEYS = 5000;
// the maximum number of threads to allow in the pool used by TransferManager
public static final String MAX_THREADS = "fs.s3a.threads.max";
public static final int DEFAULT_MAX_THREADS = 10;
// the time an idle thread waits before terminating
public static final String KEEPALIVE_TIME = "fs.s3a.threads.keepalivetime";
public static final int DEFAULT_KEEPALIVE_TIME = 60;
// size of each of or multipart pieces in bytes
public static final String MULTIPART_SIZE = "fs.s3a.multipart.size";
public static final long DEFAULT_MULTIPART_SIZE = 67108864; // 64M
// minimum size in bytes before we start a multipart uploads or copy
public static final String MIN_MULTIPART_THRESHOLD =
"fs.s3a.multipart.threshold";
public static final long DEFAULT_MIN_MULTIPART_THRESHOLD = 134217728; // 128M
//enable multiobject-delete calls?
public static final String ENABLE_MULTI_DELETE =
"fs.s3a.multiobjectdelete.enable";
/**
* Number of objects to delete in a single multi-object delete {@value}.
* Max: 1000.
*
* A bigger value it means fewer POST requests when deleting a directory
* tree with many objects.
* However, as you are limited to only a a few thousand requests per
* second against a single partition of an S3 bucket,
* a large page size can easily overload the bucket and so trigger
* throttling.
*
* Furthermore, as the reaction to this request is being throttled
* is simply to retry it -it can take a while for the situation to go away.
* While a large value may give better numbers on tests and benchmarks
* where only a single operations being executed, once multiple
* applications start working with the same bucket these large
* deletes can be highly disruptive.
*/
public static final String BULK_DELETE_PAGE_SIZE =
"fs.s3a.bulk.delete.page.size";
/**
* Default Number of objects to delete in a single multi-object
* delete: {@value}.
*/
public static final int BULK_DELETE_PAGE_SIZE_DEFAULT = 250;
// comma separated list of directories
public static final String BUFFER_DIR = "fs.s3a.buffer.dir";
// switch to the fast block-by-block upload mechanism
// this is the only supported upload mechanism
@Deprecated
public static final String FAST_UPLOAD = "fs.s3a.fast.upload";
@Deprecated
public static final boolean DEFAULT_FAST_UPLOAD = false;
//initial size of memory buffer for a fast upload
@Deprecated
public static final String FAST_BUFFER_SIZE = "fs.s3a.fast.buffer.size";
public static final int DEFAULT_FAST_BUFFER_SIZE = 1048576; //1MB
/**
* What buffer to use.
* Default is {@link #FAST_UPLOAD_BUFFER_DISK}
* Value: {@value}
*/
public static final String FAST_UPLOAD_BUFFER =
"fs.s3a.fast.upload.buffer";
/**
* Buffer blocks to disk: {@value}.
* Capacity is limited to available disk space.
*/
public static final String FAST_UPLOAD_BUFFER_DISK = "disk";
/**
* Use an in-memory array. Fast but will run of heap rapidly: {@value}.
*/
public static final String FAST_UPLOAD_BUFFER_ARRAY = "array";
/**
* Use a byte buffer. May be more memory efficient than the
* {@link #FAST_UPLOAD_BUFFER_ARRAY}: {@value}.
*/
public static final String FAST_UPLOAD_BYTEBUFFER = "bytebuffer";
/**
* Default buffer option: {@value}.
*/
public static final String DEFAULT_FAST_UPLOAD_BUFFER =
FAST_UPLOAD_BUFFER_DISK;
/**
* Maximum Number of blocks a single output stream can have
* active (uploading, or queued to the central FileSystem
* instance's pool of queued operations.
* This stops a single stream overloading the shared thread pool.
* {@value}
* <p>
* Default is {@link #DEFAULT_FAST_UPLOAD_ACTIVE_BLOCKS}
*/
public static final String FAST_UPLOAD_ACTIVE_BLOCKS =
"fs.s3a.fast.upload.active.blocks";
/**
* Limit of queued block upload operations before writes
* block. Value: {@value}
*/
public static final int DEFAULT_FAST_UPLOAD_ACTIVE_BLOCKS = 4;
/**
* Rather than raise an exception when an attempt is
* made to call the Syncable APIs, warn and downgrade.
* Value: {@value}.
*/
public static final String DOWNGRADE_SYNCABLE_EXCEPTIONS =
"fs.s3a.downgrade.syncable.exceptions";
/**
* Default value for syncable invocation.
* Value: {@value}.
*/
public static final boolean DOWNGRADE_SYNCABLE_EXCEPTIONS_DEFAULT =
true;
/**
* The capacity of executor queues for operations other than block
* upload, where {@link #FAST_UPLOAD_ACTIVE_BLOCKS} is used instead.
* This should be less than {@link #MAX_THREADS} for fair
* submission.
* Value: {@value}.
*/
public static final String EXECUTOR_CAPACITY = "fs.s3a.executor.capacity";
/**
* The capacity of executor queues for operations other than block
* upload, where {@link #FAST_UPLOAD_ACTIVE_BLOCKS} is used instead.
* Value: {@value}
*/
public static final int DEFAULT_EXECUTOR_CAPACITY = 16;
// Private | PublicRead | PublicReadWrite | AuthenticatedRead |
// LogDeliveryWrite | BucketOwnerRead | BucketOwnerFullControl
public static final String CANNED_ACL = "fs.s3a.acl.default";
public static final String DEFAULT_CANNED_ACL = "";
/**
* Content encoding: gzip, deflate, compress, br, etc.
* Value {@value}.
*/
public static final String CONTENT_ENCODING = "fs.s3a.object.content.encoding";
/**
* S3 storage class: standard, reduced_redundancy, intelligent_tiering etc.
* Value {@value }.
*/
public static final String STORAGE_CLASS = "fs.s3a.create.storage.class";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_STANDARD = "standard";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_REDUCED_REDUNDANCY = "reduced_redundancy";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_GLACIER = "glacier";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_STANDARD_INFREQUENT_ACCESS = "standard_ia";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_ONEZONE_INFREQUENT_ACCESS = "onezone_ia";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_INTELLIGENT_TIERING = "intelligent_tiering";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_DEEP_ARCHIVE = "deep_archive";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_OUTPOSTS = "outposts";
/**
* S3 Storage option: {@value}.
*/
public static final String STORAGE_CLASS_GLACIER_INSTANT_RETRIEVAL = "glacier_ir";
// should we try to purge old multipart uploads when starting up
public static final String PURGE_EXISTING_MULTIPART =
"fs.s3a.multipart.purge";
public static final boolean DEFAULT_PURGE_EXISTING_MULTIPART = false;
// purge any multipart uploads older than this number of seconds
public static final String PURGE_EXISTING_MULTIPART_AGE =
"fs.s3a.multipart.purge.age";
public static final long DEFAULT_PURGE_EXISTING_MULTIPART_AGE = 86400;
/**
* s3 server-side encryption, see
* {@link S3AEncryptionMethods} for valid options.
*
* {@value}
*/
@Deprecated
public static final String SERVER_SIDE_ENCRYPTION_ALGORITHM =
"fs.s3a.server-side-encryption-algorithm";
/**
* The standard encryption algorithm AWS supports.
* Different implementations may support others (or none).
* Use the S3AEncryptionMethods instead when configuring
* which Server Side Encryption to use.
* Value: "{@value}".
*/
@Deprecated
public static final String SERVER_SIDE_ENCRYPTION_AES256 =
"AES256";
/**
* Used to specify which AWS KMS key to use if
* {@link #SERVER_SIDE_ENCRYPTION_ALGORITHM} is
* {@code SSE-KMS} (will default to aws/s3
* master key if left blank).
* With with {@code SSE_C}, the base-64 encoded AES 256 key.
* May be set within a JCEKS file.
* Value: "{@value}".
*/
@Deprecated
public static final String SERVER_SIDE_ENCRYPTION_KEY =
"fs.s3a.server-side-encryption.key";
/**
* Set S3-server side encryption(SSE) or S3-Client side encryption(CSE)
* algorithm. Check {@link S3AEncryptionMethods} for valid options.
* <br>
* value: {@value}
*/
public static final String S3_ENCRYPTION_ALGORITHM =
"fs.s3a.encryption.algorithm";
/**
* Set S3-SSE or S3-CSE encryption Key if required.
* <br>
* <i>Note:</i>
* <ul>
* <li>In case of S3-CSE this value needs to be set for CSE to work.</li>
* <li>In case of S3-SSE follow {@link #SERVER_SIDE_ENCRYPTION_KEY}</li>
* </ul>
* value:{@value}
*/
public static final String S3_ENCRYPTION_KEY =
"fs.s3a.encryption.key";
/**
* List of custom Signers. The signer class will be loaded, and the signer
* name will be associated with this signer class in the S3 SDK.
* Examples
* CustomSigner {@literal ->} 'CustomSigner:org.apache...CustomSignerClass'
* CustomSigners {@literal ->} 'CSigner1:CSigner1Class,CSigner2:CSigner2Class'
* Initializer {@literal ->} 'CSigner1:CSigner1Class:CSigner1InitializerClass'
* With Existing {@literal ->} 'AWS4Signer,CSigner1,CSigner2:CSigner2Class'
*/
public static final String CUSTOM_SIGNERS = "fs.s3a.custom.signers";
/**
* Multiple parameters can be used to specify a non-default signing
* algorithm.<br>
* fs.s3a.signing-algorithm - This property has existed for the longest time.
* If specified, without other properties being specified,
* this signing algorithm will be used for all services. <br>
* Another property overrides this value for S3. <br>
* fs.s3a.s3.signing-algorithm - Allows overriding the S3 Signing algorithm.
* Specifying this property without specifying
* fs.s3a.signing-algorithm will only update the signing algorithm for S3
* requests.
* {@code fs.s3a.sts.signing-algorithm}: algorithm to use for STS interaction.
*/
public static final String SIGNING_ALGORITHM = "fs.s3a.signing-algorithm";
public static final String SIGNING_ALGORITHM_S3 =
"fs.s3a." + Constants.AWS_SERVICE_IDENTIFIER_S3.toLowerCase()
+ ".signing-algorithm";
@Deprecated
public static final String SIGNING_ALGORITHM_DDB =
"fs.s3a." + Constants.AWS_SERVICE_IDENTIFIER_DDB.toLowerCase()
+ "signing-algorithm";
public static final String SIGNING_ALGORITHM_STS =
"fs.s3a." + Constants.AWS_SERVICE_IDENTIFIER_STS.toLowerCase()
+ "signing-algorithm";
public static final String S3N_FOLDER_SUFFIX = "_$folder$";
public static final String FS_S3A_BLOCK_SIZE = "fs.s3a.block.size";
public static final String FS_S3A = "s3a";
/** Prefix for all S3A properties: {@value}. */
public static final String FS_S3A_PREFIX = "fs.s3a.";
/** Prefix for S3A bucket-specific properties: {@value}. */
public static final String FS_S3A_BUCKET_PREFIX = "fs.s3a.bucket.";
/**
* Default port for this is 443: HTTPS.
*/
public static final int S3A_DEFAULT_PORT = 443;
public static final String USER_AGENT_PREFIX = "fs.s3a.user.agent.prefix";
/**
* Paths considered "authoritative".
* When S3guard was supported, this skipped checks to s3 on directory listings.
* It is also use to optionally disable marker retentation purely on these
* paths -a feature which is still retained/available.
* */
public static final String AUTHORITATIVE_PATH = "fs.s3a.authoritative.path";
public static final String[] DEFAULT_AUTHORITATIVE_PATH = {};
/**
* Whether or not to allow MetadataStore to be source of truth.
* @deprecated no longer supported
*/
@Deprecated
public static final String METADATASTORE_AUTHORITATIVE =
"fs.s3a.metadatastore.authoritative";
@Deprecated
public static final boolean DEFAULT_METADATASTORE_AUTHORITATIVE = false;
/**
* Bucket validation parameter which can be set by client. This will be
* used in {@code S3AFileSystem.initialize(URI, Configuration)}.
* Value: {@value}
*/
public static final String S3A_BUCKET_PROBE = "fs.s3a.bucket.probe";
/**
* Default value of bucket validation parameter. An existence of bucket
* will be validated using {@code S3AFileSystem.verifyBucketExistsV2()}.
* Value: {@value}
*/
public static final int S3A_BUCKET_PROBE_DEFAULT = 0;
/**
* How long a directory listing in the MS is considered as authoritative.
* @deprecated no longer supported
*/
@Deprecated
public static final String METADATASTORE_METADATA_TTL =
"fs.s3a.metadatastore.metadata.ttl";
/**
* Default TTL in milliseconds: 15 minutes.
*/
@Deprecated
public static final long DEFAULT_METADATASTORE_METADATA_TTL =
TimeUnit.MINUTES.toMillis(15);
/** read ahead buffer size to prevent connection re-establishments. */
public static final String READAHEAD_RANGE = "fs.s3a.readahead.range";
public static final long DEFAULT_READAHEAD_RANGE = 64 * 1024;
/**
* The threshold at which drain operations switch
* to being asynchronous with the schedule/wait overhead
* compared to synchronous.
* Value: {@value}
*/
public static final String ASYNC_DRAIN_THRESHOLD = "fs.s3a.input.async.drain.threshold";
/**
* This is a number based purely on experimentation in
* {@code ITestS3AInputStreamPerformance}.
* Value: {@value}
*/
public static final int DEFAULT_ASYNC_DRAIN_THRESHOLD = 16_000;
/**
* Which input strategy to use for buffering, seeking and similar when
* reading data.
* Value: {@value}
*/
public static final String INPUT_FADVISE =
"fs.s3a.experimental.input.fadvise";
/**
* The default value for this FS.
* Which for S3A, is adaptive.
* Value: {@value}
* @deprecated use the {@link Options.OpenFileOptions} value
* in code which only needs to be compiled against newer hadoop
* releases.
*/
public static final String INPUT_FADV_DEFAULT =
Options.OpenFileOptions.FS_OPTION_OPENFILE_READ_POLICY_DEFAULT;
/**
* General input. Some seeks, some reads.
* The policy name "default" is standard across different stores,
* and should be preferred.
* Value: {@value}
*/
public static final String INPUT_FADV_NORMAL = "normal";
/**
* Optimized for sequential access.
* Value: {@value}
* @deprecated use the {@link Options.OpenFileOptions} value
* in code which only needs to be compiled against newer hadoop
* releases.
*/
public static final String INPUT_FADV_SEQUENTIAL =
Options.OpenFileOptions.FS_OPTION_OPENFILE_READ_POLICY_SEQUENTIAL;
/**
* Optimized purely for random seek+read/positionedRead operations;
* The performance of sequential IO may be reduced in exchange for
* more efficient {@code seek()} operations.
* Value: {@value}
* @deprecated use the {@link Options.OpenFileOptions} value
* in code which only needs to be compiled against newer hadoop
* releases.
*/
public static final String INPUT_FADV_RANDOM =
Options.OpenFileOptions.FS_OPTION_OPENFILE_READ_POLICY_RANDOM;
/**
* Gauge name for the input policy : {@value}.
* This references an enum currently exclusive to the S3A stream.
*/
public static final String STREAM_READ_GAUGE_INPUT_POLICY =
"stream_read_gauge_input_policy";
@InterfaceAudience.Private
@InterfaceStability.Unstable
public static final String S3_CLIENT_FACTORY_IMPL =
"fs.s3a.s3.client.factory.impl";
@InterfaceAudience.Private
@InterfaceStability.Unstable
@SuppressWarnings("deprecation")
public static final Class<? extends S3ClientFactory>
DEFAULT_S3_CLIENT_FACTORY_IMPL =
DefaultS3ClientFactory.class;
/**
* Maximum number of partitions in a multipart upload: {@value}.
*/
@InterfaceAudience.Private
public static final int MAX_MULTIPART_COUNT = 10000;
/*
* Obsolete S3Guard-related options, retained purely because this file
* is @Public/@Evolving.
*/
@Deprecated
public static final String S3_METADATA_STORE_IMPL =
"fs.s3a.metadatastore.impl";
@Deprecated
public static final String FAIL_ON_METADATA_WRITE_ERROR =
"fs.s3a.metadatastore.fail.on.write.error";
@Deprecated
public static final boolean FAIL_ON_METADATA_WRITE_ERROR_DEFAULT = true;
@InterfaceStability.Unstable
@Deprecated
public static final String S3GUARD_CLI_PRUNE_AGE =
"fs.s3a.s3guard.cli.prune.age";
@Deprecated
public static final String S3GUARD_DDB_REGION_KEY =
"fs.s3a.s3guard.ddb.region";
@Deprecated
public static final String S3GUARD_DDB_TABLE_NAME_KEY =
"fs.s3a.s3guard.ddb.table";
@Deprecated
public static final String S3GUARD_DDB_TABLE_TAG =
"fs.s3a.s3guard.ddb.table.tag.";
@Deprecated
public static final String S3GUARD_DDB_TABLE_CREATE_KEY =
"fs.s3a.s3guard.ddb.table.create";
@Deprecated
public static final String S3GUARD_DDB_TABLE_CAPACITY_READ_KEY =
"fs.s3a.s3guard.ddb.table.capacity.read";
@Deprecated
public static final long S3GUARD_DDB_TABLE_CAPACITY_READ_DEFAULT = 0;
@Deprecated
public static final String S3GUARD_DDB_TABLE_CAPACITY_WRITE_KEY =
"fs.s3a.s3guard.ddb.table.capacity.write";
@Deprecated
public static final long S3GUARD_DDB_TABLE_CAPACITY_WRITE_DEFAULT = 0;
@Deprecated
public static final String S3GUARD_DDB_TABLE_SSE_ENABLED =
"fs.s3a.s3guard.ddb.table.sse.enabled";
@Deprecated
public static final String S3GUARD_DDB_TABLE_SSE_CMK =
"fs.s3a.s3guard.ddb.table.sse.cmk";
@Deprecated
public static final int S3GUARD_DDB_BATCH_WRITE_REQUEST_LIMIT = 25;
@Deprecated
public static final String S3GUARD_DDB_MAX_RETRIES =
"fs.s3a.s3guard.ddb.max.retries";
@Deprecated
public static final int S3GUARD_DDB_MAX_RETRIES_DEFAULT =
DEFAULT_MAX_ERROR_RETRIES;
@Deprecated
public static final String S3GUARD_DDB_THROTTLE_RETRY_INTERVAL =
"fs.s3a.s3guard.ddb.throttle.retry.interval";
@Deprecated
public static final String S3GUARD_DDB_THROTTLE_RETRY_INTERVAL_DEFAULT =
"100ms";
@Deprecated
@InterfaceStability.Unstable
public static final String S3GUARD_DDB_BACKGROUND_SLEEP_MSEC_KEY =
"fs.s3a.s3guard.ddb.background.sleep";
@Deprecated
public static final int S3GUARD_DDB_BACKGROUND_SLEEP_MSEC_DEFAULT = 25;
/**
* The default "Null" metadata store: {@value}.
*/
@Deprecated
public static final String S3GUARD_METASTORE_NULL
= "org.apache.hadoop.fs.s3a.s3guard.NullMetadataStore";
@Deprecated
@InterfaceStability.Unstable
public static final String S3GUARD_METASTORE_LOCAL
= "org.apache.hadoop.fs.s3a.s3guard.LocalMetadataStore";
@InterfaceStability.Unstable
@Deprecated
public static final String S3GUARD_METASTORE_LOCAL_MAX_RECORDS =
"fs.s3a.s3guard.local.max_records";
@Deprecated
public static final int DEFAULT_S3GUARD_METASTORE_LOCAL_MAX_RECORDS = 256;
@InterfaceStability.Unstable
@Deprecated
public static final String S3GUARD_METASTORE_LOCAL_ENTRY_TTL =
"fs.s3a.s3guard.local.ttl";
@Deprecated
public static final int DEFAULT_S3GUARD_METASTORE_LOCAL_ENTRY_TTL
= 60 * 1000;
@Deprecated
public static final String S3GUARD_METASTORE_DYNAMO
= "org.apache.hadoop.fs.s3a.s3guard.DynamoDBMetadataStore";
@Deprecated
public static final String S3GUARD_DISABLED_WARN_LEVEL
= "fs.s3a.s3guard.disabled.warn.level";
@Deprecated
public static final String DEFAULT_S3GUARD_DISABLED_WARN_LEVEL =
"SILENT";
/**
* Inconsistency (visibility delay) injection settings.
* No longer used.
*/
@Deprecated
public static final String FAIL_INJECT_INCONSISTENCY_KEY =
"fs.s3a.failinject.inconsistency.key.substring";
@Deprecated
public static final String FAIL_INJECT_INCONSISTENCY_MSEC =
"fs.s3a.failinject.inconsistency.msec";
@Deprecated
public static final String FAIL_INJECT_INCONSISTENCY_PROBABILITY =
"fs.s3a.failinject.inconsistency.probability";
/**
* S3 API level parameters.
*/
@InterfaceStability.Unstable
public static final String LIST_VERSION = "fs.s3a.list.version";
@InterfaceStability.Unstable
public static final int DEFAULT_LIST_VERSION = 2;
@InterfaceStability.Unstable
public static final String FAIL_INJECT_THROTTLE_PROBABILITY =
"fs.s3a.failinject.throttle.probability";
@InterfaceStability.Unstable
public static final String FAIL_INJECT_CLIENT_FACTORY =
"org.apache.hadoop.fs.s3a.InconsistentS3ClientFactory";
/**
* Number of times to retry any repeatable S3 client request on failure,
* excluding throttling requests: {@value}.
*/
public static final String RETRY_LIMIT = "fs.s3a.retry.limit";
/**
* Default retry limit: {@value}.
*/
public static final int RETRY_LIMIT_DEFAULT = 7;
/**
* Interval between retry attempts.: {@value}.
*/
public static final String RETRY_INTERVAL = "fs.s3a.retry.interval";
/**
* Default retry interval: {@value}.
*/
public static final String RETRY_INTERVAL_DEFAULT = "500ms";
/**
* Number of times to retry any throttled request: {@value}.
*/
public static final String RETRY_THROTTLE_LIMIT =
"fs.s3a.retry.throttle.limit";
/**
* Default throttled retry limit: {@value}.
*/
public static final int RETRY_THROTTLE_LIMIT_DEFAULT = 20;
/**
* Interval between retry attempts on throttled requests: {@value}.
*/
public static final String RETRY_THROTTLE_INTERVAL =
"fs.s3a.retry.throttle.interval";
/**
* Default throttled retry interval: {@value}.
*/
public static final String RETRY_THROTTLE_INTERVAL_DEFAULT = "500ms";
/**
* Should etags be exposed as checksums?
*/
public static final String ETAG_CHECKSUM_ENABLED =
"fs.s3a.etag.checksum.enabled";
/**
* Default value: false.
*/
public static final boolean ETAG_CHECKSUM_ENABLED_DEFAULT = false;
/**
* Where to get the value to use in change detection. E.g. eTag, or
* versionId?
*/
public static final String CHANGE_DETECT_SOURCE
= "fs.s3a.change.detection.source";
/**
* eTag as the change detection mechanism.
*/
public static final String CHANGE_DETECT_SOURCE_ETAG = "etag";
/**
* Object versionId as the change detection mechanism.
*/
public static final String CHANGE_DETECT_SOURCE_VERSION_ID = "versionid";
/**
* Default change detection mechanism: eTag.
*/
public static final String CHANGE_DETECT_SOURCE_DEFAULT =
CHANGE_DETECT_SOURCE_ETAG;
/**
* Mode to run change detection in. Server side comparison? Client side
* comparison? Client side compare and warn rather than exception? Don't
* bother at all?
*/
public static final String CHANGE_DETECT_MODE =
"fs.s3a.change.detection.mode";
/**
* Change is detected on the client side by comparing the returned id with the
* expected id. A difference results in {@link RemoteFileChangedException}.
*/
public static final String CHANGE_DETECT_MODE_CLIENT = "client";
/**
* Change is detected by passing the expected value in the GetObject request.
* If the expected value is unavailable, {@link RemoteFileChangedException} is
* thrown.
*/
public static final String CHANGE_DETECT_MODE_SERVER = "server";
/**
* Change is detected on the client side by comparing the returned id with the
* expected id. A difference results in a WARN level message being logged.
*/
public static final String CHANGE_DETECT_MODE_WARN = "warn";
/**
* Change detection is turned off. Readers may see inconsistent results due
* to concurrent writes without any exception or warning messages. May be
* useful with third-party S3 API implementations that don't support one of
* the change detection modes.
*/
public static final String CHANGE_DETECT_MODE_NONE = "none";
/**
* Default change detection mode: server.
*/
public static final String CHANGE_DETECT_MODE_DEFAULT =
CHANGE_DETECT_MODE_SERVER;
/**
* If true, raises a {@link RemoteFileChangedException} exception when S3
* doesn't provide the attribute defined by fs.s3a.change.detection.source.
* For example, if source is versionId, but object versioning is not enabled
* on the bucket, or alternatively if source is eTag and a third-party S3
* implementation that doesn't return eTag is used.
* <p>
* When false, only a warning message will be logged for this condition.
*/
public static final String CHANGE_DETECT_REQUIRE_VERSION =
"fs.s3a.change.detection.version.required";
/**
* Default change detection require version: true.
*/
public static final boolean CHANGE_DETECT_REQUIRE_VERSION_DEFAULT = true;
/**
* Number of times to retry any repeatable S3 client request on failure,
* excluding throttling requests: {@value}.
*/
@Deprecated
public static final String S3GUARD_CONSISTENCY_RETRY_LIMIT =
"fs.s3a.s3guard.consistency.retry.limit";
/**
* Default retry limit: {@value}.
*/
@Deprecated
public static final int S3GUARD_CONSISTENCY_RETRY_LIMIT_DEFAULT = 7;
/**
* Initial retry interval: {@value}.
*/
@Deprecated
public static final String S3GUARD_CONSISTENCY_RETRY_INTERVAL =
"fs.s3a.s3guard.consistency.retry.interval";
/**
* Default initial retry interval: {@value}.
* The consistency retry probe uses exponential backoff, because
* each probe can cause the S3 load balancers to retain any 404 in
* its cache for longer. See HADOOP-16490.
*/
@Deprecated
public static final String S3GUARD_CONSISTENCY_RETRY_INTERVAL_DEFAULT =
"2s";
public static final String AWS_SERVICE_IDENTIFIER_S3 = "S3";
@Deprecated
public static final String AWS_SERVICE_IDENTIFIER_DDB = "DDB";
public static final String AWS_SERVICE_IDENTIFIER_STS = "STS";
/**
* How long to wait for the thread pool to terminate when cleaning up.
* Value: {@value} seconds.
*/
public static final int THREAD_POOL_SHUTDOWN_DELAY_SECONDS = 30;
/**
* Policy for directory markers.
* This is a new feature of HADOOP-13230 which addresses
* some scale, performance and permissions issues -but
* at the risk of backwards compatibility.
*/
public static final String DIRECTORY_MARKER_POLICY =
"fs.s3a.directory.marker.retention";
/**
* Delete directory markers. This is the backwards compatible option.
* Value: {@value}.
*/
public static final String DIRECTORY_MARKER_POLICY_DELETE =
"delete";
/**
* Retain directory markers.
* Value: {@value}.
*/
public static final String DIRECTORY_MARKER_POLICY_KEEP =
"keep";
/**
* Retain directory markers in authoritative directory trees only.
* Value: {@value}.
*/
public static final String DIRECTORY_MARKER_POLICY_AUTHORITATIVE =
"authoritative";
/**
* Default retention policy: {@value}.
*/
public static final String DEFAULT_DIRECTORY_MARKER_POLICY =
DIRECTORY_MARKER_POLICY_DELETE;
/**
* {@code PathCapabilities} probe to verify that an S3A Filesystem
* has the changes needed to safely work with buckets where
* directoy markers have not been deleted.
* Value: {@value}.
*/
public static final String STORE_CAPABILITY_DIRECTORY_MARKER_AWARE
= "fs.s3a.capability.directory.marker.aware";
/**
* {@code PathCapabilities} probe to indicate that the filesystem
* keeps directory markers.
* Value: {@value}.
*/
public static final String STORE_CAPABILITY_DIRECTORY_MARKER_POLICY_KEEP
= "fs.s3a.capability.directory.marker.policy.keep";
/**
* {@code PathCapabilities} probe to indicate that the filesystem
* deletes directory markers.
* Value: {@value}.
*/
public static final String STORE_CAPABILITY_DIRECTORY_MARKER_POLICY_DELETE
= "fs.s3a.capability.directory.marker.policy.delete";
/**
* {@code PathCapabilities} probe to indicate that the filesystem
* keeps directory markers in authoritative paths only.
* Value: {@value}.
*/
public static final String
STORE_CAPABILITY_DIRECTORY_MARKER_POLICY_AUTHORITATIVE =
"fs.s3a.capability.directory.marker.policy.authoritative";
/**
* {@code PathCapabilities} probe to indicate that a path
* keeps directory markers.
* Value: {@value}.
*/
public static final String STORE_CAPABILITY_DIRECTORY_MARKER_ACTION_KEEP
= "fs.s3a.capability.directory.marker.action.keep";
/**
* {@code PathCapabilities} probe to indicate that a path
* deletes directory markers.
* Value: {@value}.
*/
public static final String STORE_CAPABILITY_DIRECTORY_MARKER_ACTION_DELETE
= "fs.s3a.capability.directory.marker.action.delete";
/**
* To comply with the XAttr rules, all headers of the object retrieved
* through the getXAttr APIs have the prefix: {@value}.
*/
public static final String XA_HEADER_PREFIX = "header.";
/**
* AWS S3 region for the bucket. When set bypasses the construction of
* region through endpoint url.
*/
public static final String AWS_REGION = "fs.s3a.endpoint.region";
/**
* The special S3 region which can be used to talk to any bucket.
* Value {@value}.
*/
public static final String AWS_S3_CENTRAL_REGION = "us-east-1";
/**
* Require that all S3 access is made through Access Points.
*/
public static final String AWS_S3_ACCESSPOINT_REQUIRED = "fs.s3a.accesspoint.required";
/**
* Flag for create performance.
* This is *not* a configuration option; it is for use in the
* {code createFile()} builder.
* Value {@value}.
*/
public static final String FS_S3A_CREATE_PERFORMANCE = "fs.s3a.create.performance";
/**
* Prefix for adding a header to the object when created.
* The actual value must have a "." suffix and then the actual header.
* This is *not* a configuration option; it is only for use in the
* {code createFile()} builder.
* Value {@value}.
*/
public static final String FS_S3A_CREATE_HEADER = "fs.s3a.create.header";
/**
* What is the smallest reasonable seek in bytes such
* that we group ranges together during vectored read operation.
* Value : {@value}.
*/
public static final String AWS_S3_VECTOR_READS_MIN_SEEK_SIZE =
"fs.s3a.vectored.read.min.seek.size";
/**
* What is the largest merged read size in bytes such
* that we group ranges together during vectored read.
* Setting this value to 0 will disable merging of ranges.
* Value : {@value}.
*/
public static final String AWS_S3_VECTOR_READS_MAX_MERGED_READ_SIZE =
"fs.s3a.vectored.read.max.merged.size";
/**
* Default minimum seek in bytes during vectored reads : {@value}.
*/
public static final int DEFAULT_AWS_S3_VECTOR_READS_MIN_SEEK_SIZE = 4896; // 4K
/**
* Default maximum read size in bytes during vectored reads : {@value}.
*/
public static final int DEFAULT_AWS_S3_VECTOR_READS_MAX_MERGED_READ_SIZE = 1253376; //1M
/**
* Maximum number of range reads a single input stream can have
* active (downloading, or queued) to the central FileSystem
* instance's pool of queued operations.
* This stops a single stream overloading the shared thread pool.
* {@value}
* <p>
* Default is {@link #DEFAULT_AWS_S3_VECTOR_ACTIVE_RANGE_READS}
*/
public static final String AWS_S3_VECTOR_ACTIVE_RANGE_READS =
"fs.s3a.vectored.active.ranged.reads";
/**
* Limit of queued range data download operations during vectored
* read. Value: {@value}
*/
public static final int DEFAULT_AWS_S3_VECTOR_ACTIVE_RANGE_READS = 4;
/**
* Prefix of auth classes in AWS SDK V1.
*/
public static final String AWS_AUTH_CLASS_PREFIX = "com.amazonaws.auth";
/**
* Controls whether the prefetching input stream is enabled.
*/
public static final String PREFETCH_ENABLED_KEY = "fs.s3a.prefetch.enabled";
/**
* Default option as to whether the prefetching input stream is enabled.
*/
public static final boolean PREFETCH_ENABLED_DEFAULT = false;
// If the default values are used, each file opened for reading will consume
// 64 MB of heap space (8 blocks x 8 MB each).
/**
* The size of a single prefetched block in number of bytes.
*/
public static final String PREFETCH_BLOCK_SIZE_KEY = "fs.s3a.prefetch.block.size";
public static final int PREFETCH_BLOCK_DEFAULT_SIZE = 8 * 1024 * 1024;
/**
* Maximum number of blocks prefetched at any given time.
*/
public static final String PREFETCH_BLOCK_COUNT_KEY = "fs.s3a.prefetch.block.count";
public static final int PREFETCH_BLOCK_DEFAULT_COUNT = 8;
}
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