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https://issues.apache.org/jira/browse/HADOOP-2608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559815#action_12559815
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Runping Qi commented on HADOOP-2608:
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Forgot one point: when scanning sequence files with JuteRecord with buffer
instead of ustring type, the cpu
was fluctuating between 50% and 100%.
So it was no longer completely cpu bounded.
> Reading sequence file consumes 100% cpu with maximum throughput being about
> 5MB/sec per process
> -----------------------------------------------------------------------------------------------
>
> Key: HADOOP-2608
> URL: https://issues.apache.org/jira/browse/HADOOP-2608
> Project: Hadoop
> Issue Type: Improvement
> Components: io
> Reporter: Runping Qi
>
> I did some tests on the throughput of scanning block-compressed sequence
> files.
> The sustained throughput was bounded at 5MB/sec per process, with the cpu of
> each process maxed at 100%.
> It seems to me that the cpu consumption is too high and the throughput is too
> low for just scanning files.
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