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Posted to issues@livy.apache.org by "Dhiraj Soni (Jira)" <ji...@apache.org> on 2021/02/06 05:03:00 UTC
[jira] [Created] (LIVY-805) Livy starts throwing
java.lang.IllegalStateException: failed to create a child event loop
Dhiraj Soni created LIVY-805:
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Summary: 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
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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