[jira] [Assigned] (FLUME-1037) NETCAT handler theads terminate under stress test

["Mike Percy (Assigned) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLUME-1037?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mike Percy reassigned FLUME-1037:
---------------------------------

    Assignee: Mike Percy
    
> NETCAT handler theads terminate under stress test
> -------------------------------------------------
>
>                 Key: FLUME-1037
>                 URL: https://issues.apache.org/jira/browse/FLUME-1037
>             Project: Flume
>          Issue Type: Bug
>          Components: Sinks+Sources
>    Affects Versions: v1.2.0
>         Environment: [CentOS 6.2 64-bit]
>            Reporter: Will McQueen
>            Assignee: Mike Percy
>
> Steps:
> 1. Use a props file such as the following:
> \# a = agent
> \# r = source
> \# c = channel
> \# k = sink
> a1.sources = r1
> a1.channels = c1
> a1.sinks = k1
> \# ===SOURCES===
> a1.sources.r1.type = NETCAT
> a1.sources.r1.channels = c1
> a1.sources.r1.bind = localhost
> a1.sources.r1.port = 1473
> \# ===CHANNELS===
> a1.channels.c1.type = MEMORY
> \# ===SINKS===
> a1.sinks.k1.type = NULL
> a1.sinks.k1.channel = c1
> 2. Set the FLUME_CONF_DIR to point to your conf dir
> [will@localhost flume-1.2.0-incubating-SNAPSHOT]$ export FLUME_CONF_DIR=/home/will/git/apache/flume/flume-1.2.0-incubating-SNAPSHOT/conf
> 3. Create a flume-env.sh file
> [will@localhost flume-1.2.0-incubating-SNAPSHOT]$ cp conf/flume-env.sh.template conf/flume-env.sh
> 4. Adjust the memory size within flume-env.sh (this file will be automatically sourced when calling bin/flume-ng, but only if you've specified the FLUME_CONF_DIR env var)
> (here, I went to the extreme and I set the min and max heap to 1GB. I also specified a YourKit profiler agent)
> Sample contents of flume-env.sh:
> export JAVA_OPTS="-Xms1024m -Xmx1024m -agentpath:/home/will/tools/yjp-10.0.6/bin/linux-x86-64/libyjpagent.so=tracing,noj2ee"
> 5. Run the flume NG agent:
> bin/flume-ng node --conf conf --conf-file conf/a1.properties --name a1
> 6. Open-up 10 terminal windows (on the same host) to connect to the netcat server port. Sent continuous output in each terminal. I chose to use the command:
>      yes | nc localhost 1473
> The "yes" unix cmd will continuously output 'y' char, followed by newline char. If you use YourKit and go into the Threads view, you'll see that after a while (possibly need to wait up to 10 mins) after a netcat handler thread has continuously been alternating between Runnable and Blocked states (blocking due to org.apache.klog4j.Category.log(..), but that's beside the point), the netcat handler thread enters a continuous wait state for exactly 1 minute, and then terminates (while its associated 'yes | nc localhost 1473' command is still running).
> I haven't done further analysis. My first thought was a thread safety issue. Note that there are no property file reconfigurations done during this test -- I leave the props file alone.
> I welcome your ideas/comments. I initially ran this test with the default -Xmx20m but it ran out of memory. For a future test I might lower the Xmx/Xms from 1GB to maybe 128MB.

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