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Christopher Tubbs commented on ACCUMULO-2749: --------------------------------------------- The usual case should be that there are no violations here. I'm not sure it's worth optimizing other cases. > 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 > Reporter: Keith Turner > Assignee: Eric Newton > Fix For: 1.6.0 > > 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} -- This message was sent by Atlassian JIRA (v6.2#6252)