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https://issues.apache.org/jira/browse/ACCUMULO-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13984455#comment-13984455
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ASF subversion and git services commented on ACCUMULO-2749:
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Commit 62af17d52e1a45b2dded8f7996318140c569eed2 in accumulo's branch
refs/heads/master from [~ecn]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=62af17d ]
ACCUMULO-2749 make the DefaultKeySizeConstraint a bit more efficient
> 1.6.0RC4 slower than 1.5.1
> --------------------------
>
> Key: ACCUMULO-2749
> URL: https://issues.apache.org/jira/browse/ACCUMULO-2749
> Project: Accumulo
> Issue Type: Bug
> Affects Versions: 1.6.0
> Reporter: Keith Turner
> Fix For: 1.6.1
>
> Attachments: ingest_test.diff
>
>
> I am seeing consistently slower write rates when comparing 1.5.1 and 1.6.0
> RC4. Following env :
> * hadoop 2.2.0
> * Zookeeper 3.4.5
> * Centos 6 (native, not a VM)
> * using examples/3GB/native-standalone config
> * setting tserver.mutation.queue.max 4M
> * I am running test/system/test1/ingest_test.sh
> * single node
> Saw the following rates
> {noformat}
> 1.5.1 aggregate rate : 200,806 records/sec
> 1.6.0 aggregate rate : 181,264 records/sec (90%)
> {noformat}
> Reran test setting table.walog.enabled=false
> {noformat}
> 1.5.1 aggregate rate : 302,307 records/sec
> 1.6.0 aggregate rate : 232,685 records/sec (77%)
> {noformat}
> Since the relative performance gap seemed to widen when disabling walog I
> tried another test where I disabled walogs and set the devnull iterator
> {noformat}
> 1.5.1 aggregate rate : 554,853 records/sec
> 1.6.0 aggregate rate : 373,556 records/sec (67%)
> {noformat}
> The relative performance gap grew even further.
> Used the following command to enable dev null iterator in 1.5.1 and RC4
> {noformat}
> config -t test_ingest -s
> table.iterator.minc.devnull=10,org.apache.accumulo.core.iterators.DevNull
> {noformat}
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