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From "Alex Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11243) Memory LEAK CqlInputFormat
Date Mon, 29 Feb 2016 16:25:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15172084#comment-15172084
] 

Alex Liu commented on CASSANDRA-11243:
--------------------------------------

DSE test on Cassandra 3.0.3 version doesn't have this issue. It could be something introduced
after 3.0.3.

> Memory LEAK CqlInputFormat
> --------------------------
>
>                 Key: CASSANDRA-11243
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11243
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Ubuntu 14.04.04 LTS
> Hadoop 2.7
> Cassandra 3.3
>            Reporter: Matteo Zuccon
>
> Error: "util.ResourceLeakDetector: LEAK: You are creating too many HashedWheelTimer instances.
 HashedWheelTimer is a shared resource that must be reused across the JVM,so that only a few
instances are created"
> Using CqlInputFormat.Class as input format for an Hadoop Mapreduce program (on distributed
Hadoop Cluster) gives a memory leak error.
> Version of the library used:
> <dependency>
> 	<groupId>org.apache.cassandra</groupId>
> 	<artifactId>cassandra-all</artifactId>
> 	<version>3.3</version>
> </dependency>
> The same jar is working on a single node Hadoop configuration, the memory leak error
show up in the cluster hadoop configuration.



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