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https://issues.apache.org/jira/browse/HBASE-13291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499014#comment-14499014
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Hudson commented on HBASE-13291:
--------------------------------
FAILURE: Integrated in HBase-1.1 #403 (See
[https://builds.apache.org/job/HBase-1.1/403/])
HBASE-13291 Making methods under ScannerV2#next inlineable and faster (stack:
rev 8166142b2e815fc6ab30c14a5a546cd242bf3b4c)
* hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV2.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV3.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RSRpcServices.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestTags.java
> Lift the scan ceiling
> ---------------------
>
> Key: HBASE-13291
> URL: https://issues.apache.org/jira/browse/HBASE-13291
> Project: HBase
> Issue Type: Improvement
> Components: Scanners
> Affects Versions: 1.0.0
> Reporter: stack
> Assignee: stack
> Attachments: 13291.hacks.txt, 13291.inlining.txt, Screen Shot
> 2015-03-26 at 12.12.13 PM.png, Screen Shot 2015-03-26 at 3.39.33 PM.png,
> TimeRange.patch, hack_to_bypass_bb.txt, nonBBposAndInineMvccVint.txt, q
> (1).png, scan_no_mvcc_optimized.svg, traces.7.svg, traces.filterall.svg,
> traces.nofilter.svg, traces.small2.svg, traces.smaller.svg
>
>
> Scanning medium sized rows with multiple concurrent scanners exhibits
> interesting 'ceiling' properties. A server runs at about 6.7k ops a second
> using 450% of possible 1600% of CPUs when 4 clients each with 10 threads
> doing scan 1000 rows. If I add '--filterAll' argument (do not return
> results), then we run at 1450% of possible 1600% possible but we do 8k ops a
> second.
> Let me attach flame graphs for two cases. Unfortunately, there is some
> frustrating dark art going on. Let me try figure it... Filing issue in
> meantime to keep score in.
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