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https://issues.apache.org/jira/browse/HDFS-1108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13403800#comment-13403800
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Tsz Wo (Nicholas), SZE commented on HDFS-1108:
----------------------------------------------
Hi Sanjay,
{code}
+ dir.persistBlocks(src, file);
+ if (persistBlocks) {
+ getEditLog().logSync();
+ }
{code}
Why dir.persistBlocks(src, file) is not inside the then-clause of the
if-statement?
> 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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