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

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

     [ https://issues.apache.org/jira/browse/HBASE-9305?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Purtell resolved HBASE-9305.
-----------------------------------

    Resolution: Not a Problem
      Assignee:     (was: Andrew Purtell)

> [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
>            Priority: Minor
>         Attachments: 9305.patch
>
>
> 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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