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https://issues.apache.org/jira/browse/HADOOP-3131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615716#action_12615716
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Arun C Murthy commented on HADOOP-3131:
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Matei, a minor nit: looking through your patch I realised that 'progress
reporting' based on rawIn.getPosition might actually off due to the buffering
done by IFile.Reader (see IFile.Reader.readData). Should we fix it too? (Of
course, it's only a temporary glitch i.e. till the buffered data is consumed
and won't be too bad...)
> enabling BLOCK compression for map outputs breaks the reduce progress counters
> ------------------------------------------------------------------------------
>
> Key: HADOOP-3131
> URL: https://issues.apache.org/jira/browse/HADOOP-3131
> Project: Hadoop Core
> Issue Type: Bug
> Affects Versions: 0.17.0, 0.17.1, 0.17.2, 0.18.0, 0.19.0
> Reporter: Colin Evans
> Assignee: Matei Zaharia
> Fix For: 0.19.0
>
> Attachments: HADOOP-3131-v2.patch, HADOOP-3131-v3.patch,
> HADOOP-3131-v4.patch, HADOOP-3131-v5.patch, merge-progress-trunk.patch,
> merge-progress.patch, Picture 1.png
>
>
> Enabling map output compression and setting the compression type to BLOCK
> causes the progress counters during the reduce to go crazy and report
> progress counts over 100%.
> This is problematic for speculative execution because it thinks the tasks are
> doing fine.
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