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https://issues.apache.org/jira/browse/HDFS-1363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904789#action_12904789
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Konstantin Shvachko commented on HDFS-1363:
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The block conversion should be done in {{FSNamesystem.startFileInternal()}},
when the file itself is converted to an under-construction file.
The last block of the file should be returned to {{FSNamesystem.appendFile()}},
which will make computation of the last block in {{appendFile()}} redundant.
> startFileInternal should return the last block of the file opened for append
> as an under-construction block
> -----------------------------------------------------------------------------------------------------------
>
> Key: HDFS-1363
> URL: https://issues.apache.org/jira/browse/HDFS-1363
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.21.0
> Reporter: Konstantin Shvachko
> Fix For: 0.21.1
>
>
> {{FSNamesystem.startFileInternal}} should convert the last block of the file
> opened for append to an under-construction block and return it. This will let
> remove the second synchronized section in {{FSNamesystem.appendFile()}} and
> avoid redundant computations and potential inconsistencies as stated in
> HDFS-1152.
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