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From "Sreekanth Ramakrishnan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1073) Progress reported for pipes tasks is incorrect.
Date Wed, 07 Oct 2009 08:30:31 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762934#action_12762934
] 

Sreekanth Ramakrishnan commented on MAPREDUCE-1073:
---------------------------------------------------

The implication of the incorrect progress affect scheduling of speculative tasks for the pipes
jobs. As progress reported for all the pipes task would be 100%

> Progress reported for pipes tasks is incorrect.
> -----------------------------------------------
>
>                 Key: MAPREDUCE-1073
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1073
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: pipes
>    Affects Versions: 0.20.1
>            Reporter: Sreekanth Ramakrishnan
>
> Currently in pipes, {{org.apache.hadoop.mapred.pipes.PipesMapRunner.run(RecordReader<K1,
V1>, OutputCollector<K2, V2>, Reporter)}} we do the following:
> {code}
>         while (input.next(key, value)) {
>           downlink.mapItem(key, value);
>           if(skipping) {
>             downlink.flush();
>           }
>         }
> {code}
> This would result in consumption of all the records for current task and taking task
progress to 100% whereas the actual pipes application would be trailing behind. 

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