[jira] [Created] (HBASE-9305) [0.92] TestFromClientSide.testCacheOnWriteEvictOnClose fails occasionally

["Andrew Purtell (JIRA)" <ji...@apache.org>]

Andrew Purtell created HBASE-9305:
-------------------------------------

             Summary: [0.92] TestFromClientSide.testCacheOnWriteEvictOnClose fails occasionally
                 Key: HBASE-9305
                 URL: https://issues.apache.org/jira/browse/HBASE-9305
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.92.3
            Reporter: Andrew Purtell
            Assignee: Andrew Purtell
            Priority: Minor


The assertion failures are like this:

{noformat}
java.lang.AssertionError: expected:<2089> but was:<2109>
	at org.junit.Assert.fail(Assert.java:93)
	at org.junit.Assert.failNotEquals(Assert.java:647)
	at org.junit.Assert.assertEquals(Assert.java:128)
	at org.junit.Assert.assertEquals(Assert.java:472)
	at org.junit.Assert.assertEquals(Assert.java:456)
	at org.apache.hadoop.hbase.client.TestFromClientSide.testCacheOnWriteEvictOnClose(TestFromClientSide.java:4248)
{noformat}

Also:

{noformat}
expected:<2067> but was:<2087>
{noformat}

{noformat}
expected:<2070> but was:<2090>
{noformat}

The test saves off the current block cache stats - block count and hits and misses - then puts a value and gets it back:

{code}
4242: Put put = new Put(ROW);
4243: put.add(FAMILY, QUALIFIER, data);
4244: table.put(put);
4245: assertTrue(Bytes.equals(table.get(new Get(ROW)).value(), data));
{code}

then we have these asserts:

{code}
4246: //data was in memstore so don't expect any changes
4247: assertEquals(startBlockCount, cache.getBlockCount());
4248: assertEquals(startBlockHits, cache.getStats().getHitCount());
4249: assertEquals(startBlockMiss, cache.getStats().getMissCount());
{code}

There are exactly 20 more hits than expected every time. In the log looks like there's a meta scan happening around the same time. 

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