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https://issues.apache.org/jira/browse/HADOOP-3863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618545#action_12618545
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Tsz Wo (Nicholas), SZE commented on HADOOP-3863:
------------------------------------------------
> The test failure (org.apache.hadoop.hdfs.TestFileAppend2.testComplexAppend)
> is unrelated.
I am not sure whether it is unrelated since this patch changes a core class and
this is the first time that TestFileAppend2.testComplexAppend fails.
TestFileAppend2.testComplexAppend create a number of threads appending files
concurrently. It seems to me that it might be related. Could we try Hudson
one more time?
> Use a thread-local rather than static ENCODER/DECODER variables in Text for
> synchronization
> -------------------------------------------------------------------------------------------
>
> Key: HADOOP-3863
> URL: https://issues.apache.org/jira/browse/HADOOP-3863
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.18.0
> Reporter: Arun C Murthy
> Assignee: Arun C Murthy
> Priority: Critical
> Fix For: 0.19.0
>
> Attachments: HADOOP-3863_0_20080730.patch,
> HADOOP-3863_1_20080730.patch
>
>
> Text.{ENCODER|DECODER} are static variables which need to be synchronized in
> Text.{read|write}String; given that lots of RPC code calls
> Text.{read|write}String the contention for this lock shows up very
> significantly on large clusters.
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