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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15204) Try to estimate the cell count for adding into WALEdit
Date Tue, 02 Feb 2016 17:21:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128603#comment-15128603
] 

stack commented on HBASE-15204:
-------------------------------

Good one [~ram_krish]

Is that right in batchMutate? You pass in total amount but we may break up the batch as we
retry yet you are passing same cellcount each time.... 

> Try to estimate the cell count for adding into WALEdit
> ------------------------------------------------------
>
>                 Key: HBASE-15204
>                 URL: https://issues.apache.org/jira/browse/HBASE-15204
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0
>
>         Attachments: HBASE-15204.patch, WAlEdit_add_allocation.jpg, WAlEdit_add_allocation_after_patch.jpg
>
>
> The write path profiling shows that when we try to add Cells to WALEdits we try to do
a lot of Array copy inorder to grow the Arraylist backing the WALEdits. In a simple one min
profiling of the write path with 50 YCSB threads shows around 261MB of allocation done for
the Array copy to happen. We can try to avoid that. 



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