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https://issues.apache.org/jira/browse/HADOOP-4189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633898#action_12633898
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Owen O'Malley commented on HADOOP-4189:
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Ok, I think
* we should actually set the default in hadoop-default to the real value
instead of 0, -1, or "".
* we should mark it expert
* if it isn't already, I think this should be only configured by the cluster,
not the job.
As to the defaults, I guess the question is how many minutes of run are we
willing to lose. Let's say 10 minutes, and let's say 1000 job events / minute
at 100 bytes each. That would give a ballpark figure of 1mb, which seems
reasonable.
> HADOOP-3245 is incomplete
> -------------------------
>
> Key: HADOOP-4189
> URL: https://issues.apache.org/jira/browse/HADOOP-4189
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.0
> Reporter: Amar Kamat
> Assignee: Amar Kamat
> Priority: Blocker
> Fix For: 0.19.0
>
> Attachments: HADOOP-4189-v1.patch, HADOOP-4189-v2.patch,
> HADOOP-4189-v3.1.patch, HADOOP-4189-v3.patch, HADOOP-4189.patch
>
>
> There are 2 issues with HADOOP-3245
> - The default block size for the history files in hadoop-default.conf is set
> to 0. This file will be empty throughout. It should be made null.
> - Same goes for the buffer size.
> - InterTrackerProtocol version needs to be bumped.
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