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From "Russ Weeks (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-3931) Repeated invocations of BatchScanner iterator().hasNext() causes MAC to become unresponsive
Date Thu, 02 Jul 2015 21:24:04 GMT
Russ Weeks created ACCUMULO-3931:
------------------------------------

             Summary: Repeated invocations of BatchScanner iterator().hasNext() causes MAC
to become unresponsive
                 Key: ACCUMULO-3931
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3931
             Project: Accumulo
          Issue Type: Bug
          Components: mini
    Affects Versions: 1.7.0, 1.6.3
            Reporter: Russ Weeks


Steps to reproduce:
# Instantiate a MiniAccumuloCluster with at least two tablet servers
# Create a table; add splits to the table.
# Add some mutations to the table distributed across the splits; flush the mutations.
# Create a BatchScanner across the full range of the table.
# Assert that the batch scanner has at least one KV pair by calling {{scanner.iterator().hasNext()}}
# Repeat.

It doesn't seem to matter if you close the scanner and create a new one in between calls to
hasNext, or if you re-seek the same scanner, or if the scanner is created in a static context
and re-used by multiple tests or created by each test. Eventually you will see that the {{TabletServerBatchReaderIterator}}
gets stuck polling its resultsQueue, preventing further tests from running.

This happens roughyl 20% of the time in 1.6 when I run {{mvn clean test -Dtest=org.apache.accumulo.minicluster.MultipleHasNextTest
--projects minicluster}}, maybe less often in 1.7, and 100% of the time when I try to use
the MAC in my company's product build environment, which uses gradle.

(I'll update with a link to a failing unit test as soon as I get an issue ID)



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