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https://issues.apache.org/jira/browse/HADOOP-1381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496973
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Doug Cutting commented on HADOOP-1381:
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This sounds like a time/space tradeoff. We currently have a 1% space overhead.
You've proposed a 1% time overhead (with 1MB syncs and 100MB block size,
splits would overlap the end of the block by 1%, forcing 1% non-local reads).
Perhaps there's a sweet spot somewhere between? 100k?
> 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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