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https://issues.apache.org/jira/browse/HADOOP-1381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496432
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Owen O'Malley commented on HADOOP-1381:
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If your input splits are roughly 128MB or so, putting in a sync block every 2k
is too often. By moving it up to 1MB, you can get good granularity and reduce
the overhead by a factor of 500. That seems pretty significant .
> The distance between sync blocks in SequenceFiles should be configurable
> rather than hard coded to 2000 bytes
> -------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1381
> URL: https://issues.apache.org/jira/browse/HADOOP-1381
> Project: Hadoop
> Issue Type: Improvement
> Components: io
> Reporter: Owen O'Malley
> Fix For: 0.14.0
>
>
> Currently SequenceFiles put in sync blocks every 2000 bytes. It would be much
> better if it was configurable with a much higher default (1mb or so?).
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