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https://issues.apache.org/jira/browse/HDFS-7788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14332220#comment-14332220
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Hudson commented on HDFS-7788:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #2062 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/2062/])
HDFS-7788. Post-2.6 namenode may not start up with an image containing inodes
created with an old release. Contributed by Rushabh Shah. (kihwal: rev
7ae5255a1613ccfb43646f33eabacf1062c86e93)
*
hadoop-hdfs-project/hadoop-hdfs/src/test/resources/image-with-zero-block-size.tar.gz
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFSImage.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/LongBitFormat.java
> Post-2.6 namenode may not start up with an image containing inodes created
> with an old release.
> -----------------------------------------------------------------------------------------------
>
> Key: HDFS-7788
> URL: https://issues.apache.org/jira/browse/HDFS-7788
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Kihwal Lee
> Assignee: Rushabh S Shah
> Priority: Blocker
> Fix For: 2.7.0
>
> Attachments: HDFS-7788-binary.patch, rushabh.patch
>
>
> Before HDFS-4305, which was fixed in 2.1.0-beta, clients could specify
> arbitrarily small preferred block size for a file including 0. This was
> normally done by faulty clients or failed creates, but it was possible.
> Until 2.5, reading a fsimage containing inodes with 0 byte preferred block
> size was allowed. So if a fsimage contained such an inode, the namenode would
> come up fine. In 2.6, the preferred block size is required be > 0. Because
> of this change, the image that worked with 2.5 may not work with 2.6.
> If a cluster ran a version of hadoop earlier than 2.1.0-beta before, it is
> under this risk even if it worked fine with 2.5.
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