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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8404) Pending block replication can get stuck using older genstamp
Date Wed, 20 May 2015 11:54:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14552189#comment-14552189
] 

Hudson commented on HDFS-8404:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #202 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/202/])
HDFS-8404. Pending block replication can get stuck using older genstamp. Contributed by Nathan
Roberts. (kihwal: rev 8860e352c394372e4eb3ebdf82ea899567f34e4e)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestPendingReplication.java


> Pending block replication can get stuck using older genstamp
> ------------------------------------------------------------
>
>                 Key: HDFS-8404
>                 URL: https://issues.apache.org/jira/browse/HDFS-8404
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.6.0, 2.7.0
>            Reporter: Nathan Roberts
>            Assignee: Nathan Roberts
>             Fix For: 2.7.1
>
>         Attachments: HDFS-8404-v0.patch, HDFS-8404-v1.patch
>
>
> If an under-replicated block gets into the pending-replication list, but later the  genstamp
of that block ends up being newer than the one originally submitted for replication, the block
will fail replication until the NN is restarted. 
> It will be safer if processPendingReplications()  gets up-to-date blockinfo before resubmitting
replication work.



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