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Posted to common-issues@hadoop.apache.org by "Owen O'Malley (Jira)" <ji...@apache.org> on 2022/06/30 23:00:01 UTC

[jira] [Commented] (HADOOP-18324) Interrupting RPC Client calls can lead to thread exhaustion

    [ https://issues.apache.org/jira/browse/HADOOP-18324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17561206#comment-17561206 ] 

Owen O'Malley commented on HADOOP-18324:
----------------------------------------

We had a NameNode taken out with 10k threads of which 9500 where "IPC Parameter Sending Thread ####".

> Interrupting RPC Client calls can lead to thread exhaustion
> -----------------------------------------------------------
>
>                 Key: HADOOP-18324
>                 URL: https://issues.apache.org/jira/browse/HADOOP-18324
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 3.4.0, 2.10.2, 3.3.3
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>            Priority: Critical
>
> Currently the IPC client creates a boundless number of threads to write the rpc request to the socket. The NameNode uses timeouts on its RPC calls to the Journal Node and a stuck JN will cause the NN to create an infinite set of threads.



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