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Posted to issues@tez.apache.org by "Siddharth Seth (JIRA)" <ji...@apache.org> on 2014/08/21 07:28:27 UTC

[jira] [Commented] (TEZ-1473) TEZ_RUNTIME_SHUFFLE_BUFFER is too large by default

    [ https://issues.apache.org/jira/browse/TEZ-1473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14105062#comment-14105062 ] 

Siddharth Seth commented on TEZ-1473:
-------------------------------------

[~ozawa] - TEZ_RUNTIME_SHUFFLE_BUFFER_SIZE is not the amount of memory used to retain fetched Inputs. It's the size of the buffer used by the InputStream when fetching data over a single connection, and defaults to 8KB (8 * 1024).
The fraction used to hold fetched inputs is controlled by TEZ_RUNTIME_SHUFFLE_FETCH_BUFFER_PERCENT, and is already a fraction.

> TEZ_RUNTIME_SHUFFLE_BUFFER is too large by default
> --------------------------------------------------
>
>                 Key: TEZ-1473
>                 URL: https://issues.apache.org/jira/browse/TEZ-1473
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Tsuyoshi OZAWA
>            Assignee: Tsuyoshi OZAWA
>         Attachments: TEZ-1473.1.patch
>
>
> TEZ_RUNTIME_SHUFFLE_BUFFER is 8GB by default, while TEZ_TASK_RESOURCE_MEMORY_MB_DEFAULT is 1GB. It leads OoM or Container Killer.



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