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https://issues.apache.org/jira/browse/HDFS-989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13145563#comment-13145563
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Todd Lipcon commented on HDFS-989:
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With hsync/hflush at a checksum boundary, we re-write the last checksum into
the checksum file at the same time as we append the new data. There is a race
during which the new data is there but not the checksum info -- but during
recovery operations I believe we deal with this situation by ignoring checksum
errors on the last checksum-chunk if there are no replicas with a valid
last-chunk.
> Flush/sync do not work on Hadoop LocalFileSystem
> ------------------------------------------------
>
> Key: HDFS-989
> URL: https://issues.apache.org/jira/browse/HDFS-989
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 0.20.1
> Reporter: Nathan Marz
>
> They seem to be no-ops. This is really easy to reproduce, just open a file
> using FileSystem/getLocal(new Configuration()), write data to the output
> stream, and then try to flush/sync. I also tried creating the output stream
> with a buffer size of 1, but that had no effect.
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