[ https://issues.apache.org/jira/browse/LIVY-805 ]
Larry McCay deleted comment on LIVY-805:
----------------------------------
was (Author: lmccay):
Due to the pending 2.0.0 release this JIRA has been pushed out to 2.1.0 as part
of a bulk update. If there is a specific reason to pull this back into the
2.0.0 release and you intend to provide a PR in the next few days please
provide justification and reset the Fix Version to 2.0.0.
> Livy starts throwing java.lang.IllegalStateException: failed to create a
> child event loop
> -----------------------------------------------------------------------------------------
>
> Key: LIVY-805
> URL: https://issues.apache.org/jira/browse/LIVY-805
> Project: Livy
> Issue Type: Bug
> Components: Server
> Affects Versions: 0.7.0
> Environment: EMR 6.2.0
> Reporter: Dhiraj Soni
> Priority: Critical
> Fix For: 0.9.0
>
> Attachments: livy_webserver_logs.txt
>
>
> I have a worker which keeps launching spark sessions and polling for its
> completion. This runs fine for a while but then suddenly Livy starts throwing
>
> ```
> java.lang.IllegalStateException: failed to create a child event loop
> at
> io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:88)
> at
> io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:58)
> at
> io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:47)
> at
> io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:59)
> at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:77)
> at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:72)
> at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:59)
> ```
> Full stack trace attached
>
> There aren't a lot of concurrent sessions running as well. At most 5 sessions
> running concurrently.
> This happens intermittently.
>
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