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Posted to issues@tez.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2015/04/06 08:31:12 UTC
[jira] [Commented] (TEZ-2198) Fix sorter spill counts
[ https://issues.apache.org/jira/browse/TEZ-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14480984#comment-14480984 ]
Hadoop QA commented on TEZ-2198:
--------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12723304/no_additional_spills_eg_pipelined_shuffle.png
against master revision 5e2a55f.
{color:red}-1 patch{color}. The patch command could not apply the patch.
Console output: https://builds.apache.org/job/PreCommit-TEZ-Build/395//console
This message is automatically generated.
> Fix sorter spill counts
> -----------------------
>
> Key: TEZ-2198
> URL: https://issues.apache.org/jira/browse/TEZ-2198
> Project: Apache Tez
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Attachments: TEZ-2198.1.patch, TEZ-2198.2.patch, no_additional_spills_eg_pipelined_shuffle.png, with_additional_spills.png
>
>
> Prior to pipelined shuffle, tez merged all spilled data into a single file. This ended up creating one index file and one output file. In this context, TaskCounter.ADDITIONAL_SPILL_COUNT was referred as the number of additional spills and there was no counter needed to track the number of merges.
> With pipelined shuffle, there is no final merge and ADDITIONAL_SPILL_COUNT would be misleading, as these spills are direct output files which are consumed by the consumers.
> It would be good to have the following
> - ADDITIONAL_SPILL_COUNT: represents the spills that are needed by the task to generate the final merged output
> - TOTAL_SPILLS: represents the total number of shuffle directories (index + output files) that got created at the end of processing.
> For e.g, Assume sorter generated 5 spills in an attempt
> Without pipelining:
> ==============
> ADDITIONAL_SPILL_COUNT = 5 <-- Additional spills involved in sorting
> TOTAL_SPILLS = 1 <-- Final merged output
> With pipelining:
> ============
> ADDITIONAL_SPILL_COUNT = 0 <-- Additional spills involved in sorting
> TOTAL_SPILLS = 5 <--- all spills are final output
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