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Posted to commits@cassandra.apache.org by "Dinesh Joshi (Jira)" <ji...@apache.org> on 2020/03/15 02:30:00 UTC
[jira] [Commented] (CASSANDRA-15214) OOMs caught and not rethrown
[ https://issues.apache.org/jira/browse/CASSANDRA-15214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17059535#comment-17059535 ]
Dinesh Joshi commented on CASSANDRA-15214:
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Followed up with [~jolynch] regarding his original comment about including C JVMTI agents in C*. If we build the agent for the officially supported JVMs, we should be good. We need to detect the platform, JVM combo and load it up. If the agent is unavailable for the specific VM/Platform combination, it can be disabled with a warning in the logs much like what we do with `NativeLibrary` except this will need to happen as part of the startup script.
> OOMs caught and not rethrown
> ----------------------------
>
> Key: CASSANDRA-15214
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15214
> Project: Cassandra
> Issue Type: Bug
> Components: Messaging/Client, Messaging/Internode
> Reporter: Benedict Elliott Smith
> Priority: Normal
> Fix For: 4.0, 4.0-rc
>
> Attachments: oom-experiments.zip
>
>
> Netty (at least, and perhaps elsewhere in Executors) catches all exceptions, so presently there is no way to ensure that an OOM reaches the JVM handler to trigger a crash/heapdump.
> It may be that the simplest most consistent way to do this would be to have a single thread spawned at startup that waits for any exceptions we must propagate to the Runtime.
> We could probably submit a patch upstream to Netty, but for a guaranteed future proof approach, it may be worth paying the cost of a single thread.
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