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https://issues.apache.org/jira/browse/ACCUMULO-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13983869#comment-13983869
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Josh Elser commented on ACCUMULO-2749:
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Shrunk the IMM to 512MB (from 4GB) and saw 1.6.0 ingest at a rate of 98.3% of
1.5.1 (163,180.2 records/sec compared to 165,973.4 records/sec)
Ran the test with DevNullIterator on MinC and saw 1.6.0 ingest at a rate of
90.0% of 1.5.1 (342,894 records/sec compared to 380,676.2 records/sec)
Other system details: Apache Hadoop 2.4.0, ZK 3.4.5. 8core with 32G of RAM.
Using a single spinning disk. I did modify the ingest_test.sh script to be a
little easier to run and consume output from. I'll attach the diff, and here is
the little for loop to run it a few times (how I did devnull):
{code}
for i in 1 2 3 4 5; do
../../../bin/accumulo shell -u root -p secret -e 'deletetable -f -t test_ingest'
../../../bin/accumulo org.apache.accumulo.test.TestIngest --createTable -u root
-p secret --splits 100 --rows 100 | fgrep 'records/sec'
../../../bin/accumulo shell -u root -p secret -e 'config -t test_ingest -s
table.walog.enabled=false'
../../../bin/accumulo shell -u root -p secret -e 'config -t test_ingest -s
table.iterator.minc.devnull=10,org.apache.accumulo.core.iterators.DevNull'
sleep 15
./ingest_test.sh
sleep 15
done
{code}
> 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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