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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4189) HADOOP-3245 is incomplete
Date Fri, 19 Sep 2008 09:12:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12632591#action_12632591
] 

Amar Kamat commented on HADOOP-4189:
------------------------------------

Arun,
I was not sure as to what the optimal values are. If we use default values from FileSystem
then the amount of data recovered is very low. For long running jobs with less maps, these
values should be low so that every update gets logged while for long running jobs with large
maps, it is ok to use system defaults as the frequency of updates are high. So instead of
using some heuristics and making it hardcoded, I thought its better to keep it (admin)configurable
and then come up with some better heuristics or technique to set the defaults. Any thought
on what the default values should be considering various types of jobs that can be run?

> 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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