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From "Grant Henke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLUME-2905) NetcatSource - Socket not closed when an exception is encountered during start() leading to file descriptor leaks
Date Thu, 12 May 2016 17:24:12 GMT

    [ https://issues.apache.org/jira/browse/FLUME-2905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15281789#comment-15281789
] 

Grant Henke commented on FLUME-2905:
------------------------------------

[~jarcec] Would you have time to review this? 

> NetcatSource - Socket not closed when an exception is encountered during start() leading
to file descriptor leaks
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: FLUME-2905
>                 URL: https://issues.apache.org/jira/browse/FLUME-2905
>             Project: Flume
>          Issue Type: Bug
>          Components: Sinks+Sources
>    Affects Versions: v1.6.0
>            Reporter: Siddharth Ahuja
>            Assignee: Siddharth Ahuja
>         Attachments: FLUME-2905-0.patch
>
>
> During the flume agent start-up, the flume configuration containing the NetcatSource
is parsed and the source's start() is called. If there is an issue while binding the channel's
socket to a local address to configure the socket to listen for connections following exception
is thrown but the socket open just before is not closed. 
> {code}
> 2016-05-01 03:04:37,273 ERROR org.apache.flume.lifecycle.LifecycleSupervisor: Unable
to start EventDrivenSourceRunner: { source:org.apache.flume.source.NetcatSource{name:src-1,state:IDLE}
} - Exception follows.
> org.apache.flume.FlumeException: java.net.BindException: Address already in use
>         at org.apache.flume.source.NetcatSource.start(NetcatSource.java:173)
>         at org.apache.flume.source.EventDrivenSourceRunner.start(EventDrivenSourceRunner.java:44)
>         at org.apache.flume.lifecycle.LifecycleSupervisor$MonitorRunnable.run(LifecycleSupervisor.java:251)
>         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
>         at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
>         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
>         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at java.lang.Thread.run(Thread.java:745)
> Caused by: java.net.BindException: Address already in use
>         at sun.nio.ch.Net.bind0(Native Method)
>         at sun.nio.ch.Net.bind(Net.java:444)
>         at sun.nio.ch.Net.bind(Net.java:436)
>         at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:214)
>         at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
>         at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
>         at org.apache.flume.source.NetcatSource.start(NetcatSource.java:167)
>         ... 9 more
> {code}
> The source's start() is then called again leading to another socket being opened but
not closed and so on. This leads to file descriptor (socket) leaks.
> This can be easily reproduced as follows:
> 1. Set Netcat as the source in flume agent configuration.
> 2. Set the bind port for the netcat source to a port which is already in use. e.g. in
my case I used 50010 which is the port for DataNode's XCeiver Protocol in use by the HDFS
service.
> 3. Start flume agent and perform "lsof -p <flume_process_id> | wc -l". Notice the
file descriptors keep on growing due to socket leaks with errors like: "can't identify protocol".



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