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HADOOP-8110. Fix trash checkpoint collisions (Jason Lowe via daryn) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1356897 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Daryn Sharp 2012-07-03 19:59:56 +00:00
parent f5186dabb8
commit 3c2101ae4a
2 changed files with 21 additions and 7 deletions
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2
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -167,6 +167,8 @@ Trunk (unreleased changes)
HADOOP-8548. test-patch.sh shows an incorrect link in Jekins builds
(Kihwal Lee via bobby)
HADOOP-8110. Fix trash checkpoint collisions (Jason Lowe via daryn)
OPTIMIZATIONS
HADOOP-7761. Improve the performance of raw comparisons. (todd)

22
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/TrashPolicyDefault.java
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@ -35,6 +35,7 @@ import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.Options.Rename;
import org.apache.hadoop.fs.permission.FsAction;
import org.apache.hadoop.fs.permission.FsPermission;
@ -148,21 +149,32 @@ public class TrashPolicyDefault extends TrashPolicy {
new IOException("Failed to move to trash: "+path).initCause(cause);
}
@SuppressWarnings("deprecation")
@Override
public void createCheckpoint() throws IOException {
if (!fs.exists(current)) // no trash, no checkpoint
return;
Path checkpoint;
Path checkpointBase;
synchronized (CHECKPOINT) {
checkpoint = new Path(trash, CHECKPOINT.format(new Date()));
checkpointBase = new Path(trash, CHECKPOINT.format(new Date()));
}
Path checkpoint = checkpointBase;
if (fs.rename(current, checkpoint)) {
LOG.info("Created trash checkpoint: "+checkpoint.toUri().getPath());
} else {
int attempt = 0;
while (true) {
try {
fs.rename(current, checkpoint, Rename.NONE);
break;
} catch (FileAlreadyExistsException e) {
if (++attempt > 1000) {
throw new IOException("Failed to checkpoint trash: "+checkpoint);
}
checkpoint = checkpointBase.suffix("-" + attempt);
}
}
LOG.info("Created trash checkpoint: "+checkpoint.toUri().getPath());
}
@Override