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https://issues.apache.org/jira/browse/HDFS-7661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15156395#comment-15156395
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GAO Rui commented on HDFS-7661:
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[~zhz],[~walter.k.su], [~drankye] and [~liuml07], I thought maybe we could
close current block group when flush is called. And write the new data to a new
block group. This could avoid lots of trouble, but I am not sure how hive/hbase
and other apps using flush. If these apps always using flush/sync lots of times
against on file, we might create too much new and small block groups. Could you
share your opinions?
> Erasure coding: support hflush and hsync
> ----------------------------------------
>
> Key: HDFS-7661
> URL: https://issues.apache.org/jira/browse/HDFS-7661
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Tsz Wo Nicholas Sze
> Assignee: GAO Rui
> Attachments: EC-file-flush-and-sync-steps-plan-2015-12-01.png,
> HDFS-7661-unitTest-wip-trunk.patch, HDFS-7661-wip.01.patch,
> HDFS-EC-file-flush-sync-design-version1.1.pdf,
> HDFS-EC-file-flush-sync-design-version2.0.pdf
>
>
> We also need to support hflush/hsync and visible length.
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