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From "Guangxu Cheng (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-16462) Test failure TestRSGroupsBase.testGroupBalance
Date Sun, 21 Aug 2016 03:48:20 GMT
Guangxu Cheng created HBASE-16462:

             Summary: Test failure TestRSGroupsBase.testGroupBalance
                 Key: HBASE-16462
                 URL: https://issues.apache.org/jira/browse/HBASE-16462
             Project: HBase
          Issue Type: Bug
            Reporter: Guangxu Cheng

show this fail when TestRSGroupsBase
testGroupBalance(org.apache.hadoop.hbase.rsgroup.TestRSGroups)  Time elapsed: 309.517 sec
java.lang.AssertionError: Waiting timed out after [300,000] msec
        at org.junit.Assert.fail(Assert.java:88)
        at org.apache.hadoop.hbase.Waiter.waitFor(Waiter.java:209)
        at org.apache.hadoop.hbase.Waiter.waitFor(Waiter.java:143)
        at org.apache.hadoop.hbase.HBaseTestingUtility.waitFor(HBaseTestingUtility.java:3816)
        at org.apache.hadoop.hbase.rsgroup.TestRSGroupsBase.testGroupBalance(TestRSGroupsBase.java:434)

The exception may be caused by a bug.
    TEST_UTIL.waitFor(WAIT_TIMEOUT, new Waiter.Predicate<Exception>() {
      public boolean evaluate() throws Exception {
        for (List<String> regions : getTableServerRegionMap().get(tableName).values())
          if (2 != regions.size()) {
            return false;
        return true;

The new Group has one table and three servers, and the table has six regions.
Beginning, all regions are located on a single server.
After balance, regions distributed on three server, preferably each server on two region.
However,this is not absolute. Maybe one server has one region, another server has three regions.

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