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HDFS-4035. LightWeightGSet and LightWeightHashSet increment a volatile without synchronization. Contributed by Eli Collins

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1430595 13f79535-47bb-0310-9956-ffa450edef68
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Eli Collins 2013-01-08 22:43:40 +00:00
parent 6d4a091567
commit 4ca58bd57c
2 changed files with 19 additions and 0 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -467,6 +467,9 @@ Release 2.0.3-alpha - Unreleased
HDFS-4034. Remove redundant null checks. (eli)
HDFS-4035. LightWeightGSet and LightWeightHashSet increment a
volatile without synchronization. (eli)
OPTIMIZATIONS
BUG FIXES

16
hadoop-hdfs-project/hadoop-hdfs/dev-support/findbugsExcludeFile.xml
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@ -308,4 +308,20 @@
<Field name="pendingReceivedRequests" />
<Bug pattern="VO_VOLATILE_INCREMENT" />
</Match>
<!-- The "LightWeight" classes are explicitly not thread safe -->
<Match>
<Class name="org.apache.hadoop.hdfs.util.LightWeightGSet" />
<Field name="modification" />
<Bug pattern="VO_VOLATILE_INCREMENT" />
</Match>
<Match>
<Class name="org.apache.hadoop.hdfs.util.LightWeightHashSet" />
<Field name="modification" />
<Bug pattern="VO_VOLATILE_INCREMENT" />
</Match>
<Match>
<Class name="org.apache.hadoop.hdfs.util.LightWeightLinkedSet" />
<Field name="modification" />
<Bug pattern="VO_VOLATILE_INCREMENT" />
</Match>
</FindBugsFilter>