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https://issues.apache.org/jira/browse/HDFS-5557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13830518#comment-13830518
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Hadoop QA commented on HDFS-5557:
---------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12615433/HDFS-5557.patch
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 1 new
or modified test files.
{color:red}-1 javac{color:red}. The patch appears to cause the build to
fail.
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/5551//console
This message is automatically generated.
> Write pipeline recovery for the last packet in the block may cause rejection
> of valid replicas
> ----------------------------------------------------------------------------------------------
>
> Key: HDFS-5557
> URL: https://issues.apache.org/jira/browse/HDFS-5557
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.23.9, 2.3.0
> Reporter: Kihwal Lee
> Priority: Critical
> Attachments: HDFS-5557.patch
>
>
> When a block is reported from a data node while the block is under
> construction (i.e. not committed or completed), BlockManager calls
> BlockInfoUnderConstruction.addReplicaIfNotPresent() to update the reported
> replica state. But BlockManager is calling it with the stored block, not
> reported block. This causes the recorded replicas' gen stamp to be that of
> BlockInfoUnderConstruction itself, not the one from reported replica.
> When a pipeline recovery is done for the last packet of a block, the
> incremental block reports with the new gen stamp may come before the client
> calling updatePipeline(). If this happens, these replicas will be incorrectly
> recorded with the old gen stamp and get removed later. The result is close
> or addAdditionalBlock failure.
> If the last block is completed, but the penultimate block is not because of
> this issue, the file won't be closed. If this file is not cleared, but the
> client goes away, the lease manager will try to recover the lease/block, at
> which point it will crash. I will file a separate jira for this shortly.
> The worst case is to reject all good ones and accepting a bad one. In this
> case, the block will get completed, but the data cannot be read until the
> next full block report containing one of the valid replicas is received.
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