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https://issues.apache.org/jira/browse/HDFS-6115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13949174#comment-13949174
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Hudson commented on HDFS-6115:
------------------------------
SUCCESS: Integrated in Hadoop-Yarn-trunk #522 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk/522/])
HDFS-6115. Call flush() for every append on block scan verification log.
Contributed by Vinayakumar B (szetszwo:
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1581936)
* /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/datanode/fsdataset/impl/RollingLogsImpl.java
> flush() should be called for every append on block scan verification log
> ------------------------------------------------------------------------
>
> Key: HDFS-6115
> URL: https://issues.apache.org/jira/browse/HDFS-6115
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.3.0, 2.4.0
> Reporter: Vinayakumar B
> Assignee: Vinayakumar B
> Priority: Minor
> Fix For: 2.4.0
>
> Attachments: HDFS-6115.patch
>
>
> {{RollingLogsImpl#out}} is {{PrintWriter}} and it have the default
> buffersize of 8kB.
> So until the 8kB buffer is filled all scan verification entries will not be
> flushed, hence there will be chance loosing this scan information if the
> datanode gets restarted. And One more scan will happen for these blocks.
> 8kB will have ~80 entries, so 80 blocks needs to be re-scanned again.
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