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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19506) Support variable sized chunks from ChunkCreator
Date Wed, 03 Jan 2018 14:21:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16309706#comment-16309706
] 

Ted Yu commented on HBASE-19506:
--------------------------------

bq. one index chunk with about 52800 cell-representations is allocated

Where does the number 52800 come from ?

> Support variable sized chunks from ChunkCreator
> -----------------------------------------------
>
>                 Key: HBASE-19506
>                 URL: https://issues.apache.org/jira/browse/HBASE-19506
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>
> When CellChunkMap is created it allocates a special index chunk (or chunks) where array
of cell-representations is stored. When the number of cell-representations is small, it is
preferable to allocate a chunk smaller than a default value which is 2MB.
> On the other hand, those "non-standard size" chunks can not be used in pool. On-demand
allocations in off-heap are costly. So this JIRA is about to investigate the trade of between
memory usage and the final performance. 



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