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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7943) Append cannot handle the last block with length greater than the preferred block size
Date Thu, 19 Mar 2015 11:37:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368929#comment-14368929
] 

Hudson commented on HDFS-7943:
------------------------------

FAILURE: Integrated in Hadoop-Yarn-trunk #871 (See [https://builds.apache.org/job/Hadoop-Yarn-trunk/871/])
HDFS-7943. Append cannot handle the last block with length greater than the preferred block
size. Contributed by Jing Zhao. (jing9: rev bee5a6a64a1c037308fa4d52249be39c82791590)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestHDFSConcat.java
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirConcatOp.java


> Append cannot handle the last block with length greater than the preferred block size
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-7943
>                 URL: https://issues.apache.org/jira/browse/HDFS-7943
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.0
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>            Priority: Blocker
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7943.000.patch, HDFS-7943.001.patch
>
>
> In HDFS-3689, we remove the restriction from concat that all the source files should
have the same preferred block size with the target file. This can cause a file to contain
blocks with size larger than its preferred block size.
> If such block happens to be the last block of a file, and later we append data to the
file without the {{CreateFlag.NEW_BLOCK}} flag (i.e., appending data to the last block), looks
like the current client code will keep writing to the last block and never allocate a new
block.



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