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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6175) TestFSUtils flaky on hdfs getFileStatus method
Date Thu, 28 Jun 2012 10:33:43 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402990#comment-13402990
] 

nkeywal commented on HBASE-6175:
--------------------------------

Here is the fix. Without 'no go' I'll commit it this week end.
                
> TestFSUtils flaky on hdfs getFileStatus method
> ----------------------------------------------
>
>                 Key: HBASE-6175
>                 URL: https://issues.apache.org/jira/browse/HBASE-6175
>             Project: HBase
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 0.96.0
>            Reporter: nkeywal
>            Assignee: nkeywal
>            Priority: Trivial
>             Fix For: 0.96.0
>
>         Attachments: 6175.v1.patch
>
>
> This is a simplified version of a TestFSUtils issue: a sleep and the test works 100%
of the time. No sleep and it becomes flaky. Root cause unknown. While the issue appears on
the tests, the root cause could be an issue on real production system as well.
> {noformat}
> @Test
>  public void testFSUTils() throws Exception {
>    final String hosts[] = {"host1", "host2", "host3", "host4"};
>    Path testFile = new Path("/test1.txt");
>    HBaseTestingUtility htu = new HBaseTestingUtility();
>    try {
>      htu.startMiniDFSCluster(hosts).waitActive();
>      FileSystem fs = htu.getDFSCluster().getFileSystem();
>      for (int i = 0; i < 100; ++i) {
>        FSDataOutputStream out = fs.create(testFile);
>        byte[] data = new byte[1];
>        out.write(data, 0, 1);
>        out.close();
>        // Put a sleep here to make me work
>        //Thread.sleep(2000);
>        FileStatus status = fs.getFileStatus(testFile);
>        HDFSBlocksDistribution blocksDistribution =
>          FSUtils.computeHDFSBlocksDistribution(fs, status, 0, status.getLen());
>        assertEquals("Wrong number of hosts distributing blocks. at
> iteration "+i, 3,
>          blocksDistribution.getTopHosts().size());
>        fs.delete(testFile, true);
>      }
>    } finally {
>      htu.shutdownMiniDFSCluster();
>    }
>  }
> {noformat}

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