hadoop PutTracker 源码
haddop PutTracker 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/commit/PutTracker.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.commit;
import java.io.IOException;
import java.util.List;
import com.amazonaws.services.s3.model.PartETag;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.fs.statistics.IOStatistics;
/**
* Multipart put tracker.
* Base class does nothing except declare that any
* MPU must complete in the {@code close()} operation.
*
*/
@InterfaceAudience.Private
public class PutTracker {
/** The destination. */
private final String destKey;
/**
* Instantiate.
* @param destKey destination key
*/
public PutTracker(String destKey) {
this.destKey = destKey;
}
/**
* Startup event.
* @return true if the multipart should start immediately.
* @throws IOException any IO problem.
*/
public boolean initialize() throws IOException {
return false;
}
/**
* Flag to indicate that output is not immediately visible after the stream
* is closed. Default: false.
* @return true if the output's visibility will be delayed.
*/
public boolean outputImmediatelyVisible() {
return true;
}
/**
* Callback when the upload is is about to complete.
* @param uploadId Upload ID
* @param parts list of parts
* @param bytesWritten bytes written
* @param iostatistics nullable IO statistics
* @return true if the commit is to be initiated immediately.
* False implies the output stream does not need to worry about
* what happens.
* @throws IOException I/O problem or validation failure.
*/
public boolean aboutToComplete(String uploadId,
List<PartETag> parts,
long bytesWritten,
final IOStatistics iostatistics)
throws IOException {
return true;
}
/**
* get the destination key. The default implementation returns the
* key passed in: there is no adjustment of the destination.
* @return the destination to use in PUT requests.
*/
public String getDestKey() {
return destKey;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder(
"DefaultPutTracker{");
sb.append("destKey='").append(destKey).append('\'');
sb.append('}');
return sb.toString();
}
}
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