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https://issues.apache.org/jira/browse/HDFS-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452404#comment-13452404
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Colin Patrick McCabe commented on HDFS-3510:
--------------------------------------------
bq. Here's a patch which applies against branch-2
Looks good to me, very similar to the original branch-3 patch. Obviously be
sure to run at least:
TestCheckpoint,TestEditLog,TestNameNodeRecovery,TestEditLogLoading,TestNameNodeMXBean,TestSaveNamespace,TestSecurityTokenEditLog,TestStorageDirectoryFailure,TestStorageRestore,TestFileJournalManager,TestEditLogsDuringFailover,TestEditLogTailer,TestEditLogFileOutputStream
> Improve FSEditLog pre-allocation
> --------------------------------
>
> Key: HDFS-3510
> URL: https://issues.apache.org/jira/browse/HDFS-3510
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Fix For: 3.0.0
>
> Attachments: HDFS-3510.001.patch, HDFS-3510.003.patch,
> HDFS-3510.004.patch, HDFS-3510.004.patch, HDFS-3510.006.patch,
> HDFS-3510.007.patch, HDFS-3510.008.patch, HDFS-3510.009.patch,
> HDFS-3510.010.patch, HDFS-3510.011.patch, HDFS-3510-b1.001.patch,
> HDFS-3510-b1.002.patch, hdfs-3510-branch-2.txt
>
>
> It is good to avoid running out of space in the middle of writing a batch of
> edits, because when it happens, we often get partial edits at the end of the
> log.
> Edit log preallocation can solve this problem (see HADOOP-2330 for a full
> description of edit log preallocation).
> The current pre-allocation code was introduced for performance reasons, not
> for preventing partial edits. As a consequence, we sometimes do a write
> without using pre-allocation. We should change the pre-allocation code so
> that it always preallocates at least enough space before writing out the
> edits.
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