Himanshu Vashishtha created HBASE-7338:
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Summary: Fix flaky condition for
org.apache.hadoop.hbase.TestRegionRebalancing.testRebalanceOnRegionServerNumberChange
Key: HBASE-7338
URL: https://issues.apache.org/jira/browse/HBASE-7338
Project: HBase
Issue Type: Bug
Components: test
Affects Versions: 0.94.3, 0.96.0
Reporter: Himanshu Vashishtha
Priority: Minor
The balancer doesn't run in case a region is in-transition. The check to
confirm whether there all regions are assigned looks for region count > 22,
where the total regions are 27. This may result in a failure:
{code}
java.lang.AssertionError: After 5 attempts, region assignments were not
balanced.
at org.junit.Assert.fail(Assert.java:93)
at
org.apache.hadoop.hbase.TestRegionRebalancing.assertRegionsAreBalanced(TestRegionRebalancing.java:203)
at
org.apache.hadoop.hbase.TestRegionRebalancing.testRebalanceOnRegionServerNumberChange(TestRegionRebalancing.java:123)
.....
2012-12-11 13:47:02,231 INFO [pool-1-thread-1]
hbase.TestRegionRebalancing(120): Added fourth
server=p0118.mtv.cloudera.com,44414,1355262422083
2012-12-11 13:47:02,231 INFO
[RegionServer:3;p0118.mtv.cloudera.com,44414,1355262422083]
regionserver.HRegionServer(3769): Registered RegionServer MXBean
2012-12-11 13:47:02,231 DEBUG [pool-1-thread-1] master.HMaster(987): Not
running balancer because 1 region(s) in transition:
{c786446fb2542f190e937057cdc79d9d=test,kkk,1355262401365.c786446fb2542f190e937057cdc79d9d.
state=OPENING, ts=1355262421037,
server=p0118.mtv.cloudera.com,54281,1355262419765}
2012-12-11 13:47:02,232 DEBUG [pool-1-thread-1]
hbase.TestRegionRebalancing(165): There are 4 servers and 26 regions. Load
Average: 13.0 low border: 9, up border: 16; attempt: 0
2012-12-11 13:47:02,232 DEBUG [pool-1-thread-1]
hbase.TestRegionRebalancing(171): p0118.mtv.cloudera.com,51590,1355262395329
Avg: 13.0 actual: 11
2012-12-11 13:47:02,232 DEBUG [pool-1-thread-1]
hbase.TestRegionRebalancing(171): p0118.mtv.cloudera.com,52987,1355262407916
Avg: 13.0 actual: 15
2012-12-11 13:47:02,233 DEBUG [pool-1-thread-1]
hbase.TestRegionRebalancing(171): p0118.mtv.cloudera.com,48044,1355262421787
Avg: 13.0 actual: 0
2012-12-11 13:47:02,233 DEBUG [pool-1-thread-1]
hbase.TestRegionRebalancing(179): p0118.mtv.cloudera.com,48044,1355262421787
Isn't balanced!!! Avg: 13.0 actual: 0 slop: 0.2
2012-12-11 13:47:12,233 DEBUG [pool-1-thread-1] master.HMaster(987): Not
running balancer because 1 region(s) in transition:
{code}
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