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https://issues.apache.org/jira/browse/HDFS-5590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13841244#comment-13841244
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Hudson commented on HDFS-5590:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #1630 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1630/])
HDFS-5590. Block ID and generation stamp may be reused when persistBlocks is
set to false. Contributed by Jing Zhao. (jing9:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1548368)
* /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/DFSConfigKeys.java
*
/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/TestPersistBlocks.java
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestBackupNode.java
> Block ID and generation stamp may be reused when persistBlocks is set to false
> ------------------------------------------------------------------------------
>
> Key: HDFS-5590
> URL: https://issues.apache.org/jira/browse/HDFS-5590
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.2.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Fix For: 2.3.0
>
> Attachments: HDFS-5590.000.patch, HDFS-5590.001.patch
>
>
> In a cluster with non-HA setup and dfs.persist.blocks set to false, we may
> have data loss in the following case:
> # client creates file1 and requests a block from NN and get blk_id1_gs1
> # client writes blk_id1_gs1 to DN
> # NN is restarted and because persistBlocks is false, blk_id1_gs1 may not be
> persisted in disk
> # another client creates file2 and NN will allocate a new block using the
> same block id blk_id1_gs1 since block ID and generation stamp are both
> increased sequentially.
> Now we may have two versions (file1 and file2) of the blk_id1_gs1 (same id,
> same gs) in the system. It will case data loss.
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