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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7475) Make TestLazyPersistFiles#testLazyPersistBlocksAreSaved deterministic
Date Thu, 04 Dec 2014 23:36:13 GMT
Xiaoyu Yao created HDFS-7475:
--------------------------------

             Summary: Make TestLazyPersistFiles#testLazyPersistBlocksAreSaved deterministic

                 Key: HDFS-7475
                 URL: https://issues.apache.org/jira/browse/HDFS-7475
             Project: Hadoop HDFS
          Issue Type: Test
          Components: test
    Affects Versions: 2.6.0
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


TestLazyPersistFiles#testLazyPersistBlocksAreSaved verifies that the memory block is saved
in lazy persist directory after some sleep with the following code. 

{code}     
// Sleep for a short time to allow the lazy writer thread to do its job
    Thread.sleep(6 * LAZY_WRITER_INTERVAL_SEC * 1000);
{code} 

However, the sleep only guarantees an async lazy persist task is scheduled. The task running
on a per volume thread pool thread can take longer to finish persisting. It will be more deterministic
to wait the pending lazy persist task count reduce to 0 before verifying the block file exist
in lazy persist dir. 





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