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https://issues.apache.org/jira/browse/HDFS-4452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13569540#comment-13569540
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Hudson commented on HDFS-4452:
------------------------------
Integrated in Hadoop-Hdfs-trunk #1304 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1304/])
HDFS-4452. getAdditionalBlock() can create multiple blocks if the client
times out and retries. Contributed by Konstantin Shvachko. (Revision 1441681)
Result = SUCCESS
shv : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1441681
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestAddBlockRetry.java
> getAdditionalBlock() can create multiple blocks if the client times out and
> retries.
> ------------------------------------------------------------------------------------
>
> Key: HDFS-4452
> URL: https://issues.apache.org/jira/browse/HDFS-4452
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.0.2-alpha
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Priority: Critical
> Fix For: 2.0.3-alpha
>
> Attachments: getAdditionalBlock-branch2.patch,
> getAdditionalBlock.patch, getAdditionalBlock.patch, getAdditionalBlock.patch,
> TestAddBlockRetry.java
>
>
> HDFS client tries to addBlock() to a file. If NameNode is busy the client can
> timeout and will reissue the same request again. The two requests will race
> with each other in {{FSNamesystem.getAdditionalBlock()}}, which can result in
> creating two new blocks on the NameNode while the client will know of only
> one of them. This eventually results in {{NotReplicatedYetException}} because
> the extra block is never reported by any DataNode, which stalls file creation
> and puts it in invalid state with an empty block in the middle.
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