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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15544) HFileReaderImpl.readBlock allocates memory for HFileBlock on every call
Date Tue, 29 Mar 2016 04:46:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15215416#comment-15215416
] 

Anoop Sam John commented on HBASE-15544:
----------------------------------------

For a normal read, we may not be able to reuse them.  The cells read from this block might
not have been written out to RPC layer yet!  The cells will directly refer to these byte[]
to which we read from HDFS.    Ya in case of compaction, we may reuse them.  We have already
written the cells to compacted file writer. 

> HFileReaderImpl.readBlock allocates memory for HFileBlock on every call
> -----------------------------------------------------------------------
>
>                 Key: HBASE-15544
>                 URL: https://issues.apache.org/jira/browse/HBASE-15544
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Compaction
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>             Fix For: 2.0.0
>
>
> This accounts for 25% of memory allocation during compaction when compression is enabled.



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