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Posted to common-dev@hadoop.apache.org by "Mathias Herberts (Jira)" <ji...@apache.org> on 2020/01/03 11:03:00 UTC

[jira] [Created] (HADOOP-16786) SequenceFile.Writer#hsync does not sync to disk when checksums are used

Mathias Herberts created HADOOP-16786:
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             Summary: SequenceFile.Writer#hsync does not sync to disk when checksums are used
                 Key: HADOOP-16786
                 URL: https://issues.apache.org/jira/browse/HADOOP-16786
             Project: Hadoop Common
          Issue Type: Bug
            Reporter: Mathias Herberts


Recently I created a SequenceFile Writer and was surprised to see that the file size was not changing despite hsync being called after each append.

After some fiddling around, I noticed that if write checksums are disabled then the hsync is effective.

I checked the documentation and could not find any mention of the fact that hsync could be ineffective when write checksums are on.

The Writer was using the LocalFilesystem.



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