Keith Turner created ACCUMULO-2749:
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Summary: 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
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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