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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11355) Hive on tez: memory manager for sort buffers (input/output) and operators
Date Fri, 07 Aug 2015 19:59:46 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662338#comment-14662338
] 

Sergey Shelukhin commented on HIVE-11355:
-----------------------------------------

What is the magic with TEN_MB, should it be configurable?
remainingMemory = totalAvailableMemory / 2 nit - can be assigned in one statement in the line
above
Why is totalRequiredInputOutputMem required? Is Tez supposed to hold entire input and entire
output in memory?
if (remainingMemory < 0) { - log?

Should any of this be in explain (extended?) output?
Would any other q tests be affected by the addition of "Dummy Store" line to explain?

> Hive on tez: memory manager for sort buffers (input/output) and operators
> -------------------------------------------------------------------------
>
>                 Key: HIVE-11355
>                 URL: https://issues.apache.org/jira/browse/HIVE-11355
>             Project: Hive
>          Issue Type: Improvement
>          Components: Tez
>    Affects Versions: 2.0.0
>            Reporter: Vikram Dixit K
>            Assignee: Vikram Dixit K
>         Attachments: HIVE-11355.1.patch, HIVE-11355.2.patch, HIVE-11355.3.patch
>
>
> We need to better manage the sort buffer allocations to ensure better performance. Also,
we need to provide configurations to certain operators to stay within memory limits.



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