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From "Rajesh Balamohan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TEZ-2575) Handle KeyValue pairs size which do not fit in a single block
Date Fri, 03 Jul 2015 09:01:05 GMT

     [ https://issues.apache.org/jira/browse/TEZ-2575?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rajesh Balamohan updated TEZ-2575:
----------------------------------
    Attachment: TEZ-2575.4.patch

Added "conf.setBoolean(TezRuntimeConfiguration.TEZ_RUNTIME_ENABLE_FINAL_MERGE_IN_OUTPUT, true)"
in "testExceedsKVWithPipelinedShuffle".  No other change than previous patch.

Will commit once test passes.

> Handle KeyValue pairs size which do not fit in a single block
> -------------------------------------------------------------
>
>                 Key: TEZ-2575
>                 URL: https://issues.apache.org/jira/browse/TEZ-2575
>             Project: Apache Tez
>          Issue Type: Improvement
>            Reporter: Saikat
>            Assignee: Saikat
>         Attachments: TEZ-2575.1.patch, TEZ-2575.2.patch, TEZ-2575.3.patch, TEZ-2575.4.patch,
TEZ-2575.patch
>
>
> In the present implementation, the available buffer is divided into blocks (specified
in the constructor for pipeline sort). and a linked list of these block byte buffers is maintained.

> A span is created out of the buffers. 
> The present logic, doesnot handle scenario where a single key-value pair size doesnot
fit into any of the blocks.
> example if 1mb total memory is divided into 4 blocks, (256 kb each),
> if a single KV pair is greater than the blocksize(~ignoring meta data size), 
> then it fails with buffer exceptions.



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