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https://issues.apache.org/jira/browse/HADOOP-4396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640206#action_12640206
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Raghu Angadi commented on HADOOP-4396:
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That is very strange. Could you post the patch you used? What is the typical
write size otherwise? With the modified write(), actual write systemcall to
the file ends up being of the size "io.file.buffer.size".
The performance difference you are seeing the 3 minutes over 29 minutes, right?
Even 29 minutes on 0.18 was due to such stranglers?
> sort on 400 nodes is now slower than in 18
> ------------------------------------------
>
> Key: HADOOP-4396
> URL: https://issues.apache.org/jira/browse/HADOOP-4396
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Jothi Padmanabhan
> Assignee: Jothi Padmanabhan
> Priority: Blocker
> Fix For: 0.19.0
>
>
> Sort on 400 nodes on hadoop release 18 takes about 29 minutes, but with the
> 19 branch takes about 32 minutes. This behavior is consistent.
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