Details
-
Bug
-
Status: Resolved
-
Major
-
Resolution: Fixed
-
None
-
None
-
None
Description
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
1.5.1 aggregate rate : 200,806 records/sec 1.6.0 aggregate rate : 181,264 records/sec (90%)
Reran test setting table.walog.enabled=false
1.5.1 aggregate rate : 302,307 records/sec 1.6.0 aggregate rate : 232,685 records/sec (77%)
Since the relative performance gap seemed to widen when disabling walog I tried another test where I disabled walogs and set the devnull iterator
1.5.1 aggregate rate : 554,853 records/sec 1.6.0 aggregate rate : 373,556 records/sec (67%)
The relative performance gap grew even further.
Used the following command to enable dev null iterator in 1.5.1 and RC4
config -t test_ingest -s table.iterator.minc.devnull=10,org.apache.accumulo.core.iterators.DevNull
Attachments
Attachments
Issue Links
- relates to
-
ACCUMULO-2762 Use better compiler optimizations by default for native maps
- Resolved