[jira] [Commented] (TEZ-1288) Create FastTezSerialization as an optional feature

["Gopal V (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-1288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071624#comment-14071624 ] 

Gopal V commented on TEZ-1288:
------------------------------

Please post the 200Gb scale in-memory sizes, for comparison.

> Create FastTezSerialization as an optional feature
> --------------------------------------------------
>
>                 Key: TEZ-1288
>                 URL: https://issues.apache.org/jira/browse/TEZ-1288
>             Project: Apache Tez
>          Issue Type: Improvement
>    Affects Versions: 0.5.0
>            Reporter: Gopal V
>            Assignee: Rajesh Balamohan
>         Attachments: TEZ-1288.1.patch, TEZ-1288.2.patch
>
>
> Tez inherits the writable framework from map-reduce. 
> This is very flexible, but not particularly memory efficient for the small data types.
> When deserializing, each value and key has to be allocated afresh for each small chunk of data (new IntWritable instead of .set()).
> The bytes writable serialization operation always has to write a 4 byte prefix for  all values and keys, because of requirements around streamed .readFields() instead of a customer setter/getter impl.
> Implement a faster serialization mechanism for the inner loop of sort, spill, merge, which doesn't trigger the GC and avoids adding simplistic overheads to the IFile format.



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