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https://issues.apache.org/jira/browse/HDFS-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sanjay Radia updated HDFS-1108:
-------------------------------
Attachment: hdfs-1108-hadoop-1.patch
Port of patch for Hadoop-1.
Note TestPersistBlocks() has 2 bugs in trunk.
The original patch (hdfs-1108.txt) called stream.flush() instead of
stream.hflush(). Flush() was correct since hflush() already forces the block
allocation to be sync'ed to the log.
The patch for ha-branch (hdfs-1108- habranch.txt) changed this as it introduced
additional tests. Hence the test is not really testing the problem that this
jira fixes.
In my port to hadoop-1, I ran TestPersistBlock without the fix to FSNamesystem
and tried both sync(ie hflush) and flush(). The tests passed with sync() but
not with flush().
Note both testRestartDfs testRestartWithPartialBlockHflushed should
call flush() and not sync() after writing DATA_BEFORE_RESTART.
I will file a jira to fix this in trunk.
> Log newly allocated blocks
> --------------------------
>
> Key: HDFS-1108
> URL: https://issues.apache.org/jira/browse/HDFS-1108
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, name-node
> Reporter: dhruba borthakur
> Assignee: Todd Lipcon
> Fix For: HA branch (HDFS-1623)
>
> Attachments: HDFS-1108.patch, hdfs-1108-habranch.txt,
> hdfs-1108-habranch.txt, hdfs-1108-habranch.txt, hdfs-1108-habranch.txt,
> hdfs-1108-habranch.txt, hdfs-1108-hadoop-1.patch, hdfs-1108.txt
>
>
> The current HDFS design says that newly allocated blocks for a file are not
> persisted in the NN transaction log when the block is allocated. Instead, a
> hflush() or a close() on the file persists the blocks into the transaction
> log. It would be nice if we can immediately persist newly allocated blocks
> (as soon as they are allocated) for specific files.
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