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From "Amar Kamat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4189) HADOOP-3245 is incomplete
Date Thu, 25 Sep 2008 04:27:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12634372#action_12634372
] 

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

bq. For restartability, we really should separate the start event from the finish event.
I dont think it really matters. Any task-attempt that has started but not closed is probably
useless w.r.t recovery. Hence task-attempt which has a _START_ and _END_ is really what we
want and hence  we can keep it as it is. 

bq. Why does it double? Hopefully we are using UTF-8 encoding so it should be 1 byte/char.
I checked on my local box and its ASCII. Assuming 3mb as the default, we now risk 5.2k tasks
which should be ok.

> 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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