accumulo-notifications mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Russ Weeks (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3931) Repeated invocations of BatchScanner iterator().hasNext() causes MAC to become unresponsive
Date Thu, 02 Jul 2015 21:31:04 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14612564#comment-14612564
] 

Russ Weeks commented on ACCUMULO-3931:
--------------------------------------

[MultipleHasNextTest.java|https://github.com/rweeks/accumulo/blob/ACCUMULO-3931/minicluster/src/test/java/org/apache/accumulo/minicluster/MultipleHasNextTest.java]
can be used to reproduce the problem, but it takes some patience. Seems more easily reproduced
in 1.6 than 1.7? With maven, roughly one out of every 5-10 invocations of :

{{mvn clean test -Dtest=org.apache.accumulo.minicluster.MultipleHasNextTest --projects minicluster}}

Fails for me.

> 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
>         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)



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message