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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1381) The distance between sync blocks in SequenceFiles should be configurable rather than hard coded to 2000 bytes
Date Wed, 16 May 2007 23:06:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12496432
] 

Owen O'Malley commented on HADOOP-1381:
---------------------------------------

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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