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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15204) Try to estimate the cell count for adding into WALEdit
Date Fri, 05 Feb 2016 11:38:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15134031#comment-15134031
] 

Hudson commented on HBASE-15204:
--------------------------------

FAILURE: Integrated in HBase-Trunk_matrix #683 (See [https://builds.apache.org/job/HBase-Trunk_matrix/683/])
HBASE-15204 Try to estimate the cell count for adding into WALEdit (Ram) (ramkrishna: rev
6f6a8ed71fe98b83e8a8db974fc15b0d8597b174)
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALEdit.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java


> 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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