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Posted to issues@hbase.apache.org by "ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org> on 2016/02/06 08:39:40 UTC
[jira] [Reopened] (HBASE-15204) Try to estimate the cell count for
adding into WALEdit
[ https://issues.apache.org/jira/browse/HBASE-15204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ramkrishna.s.vasudevan reopened HBASE-15204:
--------------------------------------------
Reopening for addressing comments from Stack.
> 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, 1.3.0
>
> Attachments: HBASE-15204.patch, HBASE-15204_1.patch, HBASE-15204_1.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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