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https://issues.apache.org/jira/browse/HBASE-20483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16467970#comment-16467970
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stack commented on HBASE-20483:
-------------------------------
Comparing 1.4 to 2.0, 1.4 flushes 70G to 2.0s 55G over the course of the test
run.
{{./hbase/bin/hbase --config ~/conf_hbase
org.apache.hadoop.hbase.PerformanceEvaluation --nomapred --presplit=40
--size=30 --columns=10 --valueSize=100 --writeToWAL=false randomWrite 100}}
Applying to memstore takes 28% of all CPU in 1.4 and almost 80% in 2.0.0. Its
like we are double adding Cells.
> [PERFORMANCE] Flushing is 2x slower in hbase2.
> ----------------------------------------------
>
> Key: HBASE-20483
> URL: https://issues.apache.org/jira/browse/HBASE-20483
> Project: HBase
> Issue Type: Sub-task
> Components: Performance
> Reporter: stack
> Assignee: stack
> Priority: Major
> Attachments: PerpetualFlushingProgram.patch,
> PerpetualFlushingProgram1.2.patch, SnapshotSegmentScanner_2.0.0.patch
>
>
> When flush is slow, memstores backup and go slower. See "1.2.7 vs. 2.0.0
> Flush History"
> https://docs.google.com/spreadsheets/d/1sihTxb4aCplR3Rr_GGXkPlwhMIm-CbB9j_5339AS0Zc/edit#gid=1016758826
> for compare. First noted by [~anoop.hbase]
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