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https://issues.apache.org/jira/browse/HBASE-15204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128408#comment-15128408
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Ted Yu commented on HBASE-15204:
--------------------------------
{code}
- WALEdit walEdit = new WALEdit(isInReplay);
+ WALEdit walEdit = new WALEdit(cellCount);
{code}
We don't need to distinguish replay mode any more ?
> 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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