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https://issues.apache.org/jira/browse/STORM-297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14020894#comment-14020894
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ASF GitHub Bot commented on STORM-297:
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Github user clockfly commented on the pull request:
https://github.com/apache/incubator-storm/pull/103#issuecomment-45416875
fixed.
The failed case is under namespace: backtype.storm.messaging-test
root cause:
The test failure is caused by the bug of local topology simulation. funtion
complete-topology will asume topology is finished after all spout return, but
it is not always true, the downstream bolts may be still working.
direct cause:
complete-topology->all spout finish -> shutdown the topology->shutdown
worker->shutdown netty client -> bolt still not finished -> bolt try to send
mesage to netty client -> client already shutdown -> throw runtime exception.
the fix is to add a config to allow this topology to wait a longer time to
be killed.
> Storm Performance cannot be scaled up by adding more CPU cores
> --------------------------------------------------------------
>
> Key: STORM-297
> URL: https://issues.apache.org/jira/browse/STORM-297
> Project: Apache Storm (Incubating)
> Issue Type: Bug
> Reporter: Sean Zhong
> Labels: Performance, netty
> Fix For: 0.9.2-incubating
>
> Attachments: Storm_performance_fix.pdf,
> storm_Netty_receiver_diagram.png, storm_conf.txt,
> storm_performance_fix.patch, worker_throughput_without_storm-297.png
>
>
> We cannot scale up the performance by adding more CPU cores and increasing
> parallelism.
> For a 2 layer topology Spout ---shuffle grouping--> bolt, when message size
> is small (around 100 bytes), we can find in the below picture that neither
> the CPU nor the network is saturated. When message size is 100 bytes, only
> 40% of CPU is used, only 18% of network is used, although we have a high
> parallelism (overall we have 144 executors)
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