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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13657) IPC Reader thread could silently die and leave NameNode unresponsive
Date Mon, 26 Sep 2016 21:01:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15524152#comment-15524152

Zhe Zhang commented on HADOOP-13657:

Thanks [~kihwal]. Linking the issue for now. I think in these 2 issues {{Reader}} died for
different reasons, but maybe the solution is similar. I don't have a patch either.

> IPC Reader thread could silently die and leave NameNode unresponsive
> --------------------------------------------------------------------
>                 Key: HADOOP-13657
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13657
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>            Reporter: Zhe Zhang
>            Priority: Critical
> For each listening port, IPC {{Server#Listener#Reader}} is a single thread in charge
of moving {{Connection}} items from {{pendingConnections}} (capacity 100) to the {{callQueue}}.
> We have experienced an incident where the {{Reader}} thread for HDFS NameNode died from
runtime exception. Then the {{pendingConnections}} queue became full and the NameNode port
became inaccessible.
> In our particular case, what killed {{Reader}} was a NPE caused by https://bugs.openjdk.java.net/browse/JDK-8024883.
But in general, other types of runtime exceptions could cause this issue as well.
> We should add logic to either make the {{Reader}} more robust in case of runtime exceptions,
or at least treat it as a FATAL exception so that NameNode can fail over to standby, and admins
get alerted of the real issue.

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