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https://issues.apache.org/jira/browse/ACCUMULO-3931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Newton resolved ACCUMULO-3931.
-----------------------------------
Resolution: Not A Problem
Feel free to open a new ticket to enhance the BatchScanner to have a different
behavior.
> 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: 1.6.3, 1.7.0
> Reporter: Russ Weeks
> Assignee: Eric Newton
> Fix For: 1.6.4, 1.7.1, 1.8.0
>
> Attachments: tablet_server_0.txt, tablet_server_1.txt,
> test_runner_stack.txt
>
>
> 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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