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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6175) TestFSUtils flaky on hdfs getFileStatus method
Date Wed, 06 Jun 2012 18:17:23 GMT
nkeywal created HBASE-6175:
------------------------------

             Summary: 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


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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