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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2549) As NettyServerCnxn.sendResponse() allows all the exception to bubble up it can stop main ZK requests processing thread
Date Sat, 05 Nov 2016 22:19:58 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15640685#comment-15640685
] 

ASF GitHub Bot commented on ZOOKEEPER-2549:
-------------------------------------------

Github user yufeldman commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/99#discussion_r86673997
  
    --- Diff: src/java/main/org/apache/zookeeper/server/NIOServerCnxn.java ---
    @@ -716,7 +716,12 @@ public void process(WatchedEvent event) {
             // Convert WatchedEvent to a type that can be sent over the wire
             WatcherEvent e = event.getWrapper();
     
    -        sendResponse(h, e, "notification");
    +        try {
    +            sendResponse(h, e, "notification");
    +        } catch (IOException ex) {
    +            LOG.debug("Problem sending to " + getRemoteSocketAddress(), ex);
    +            close();
    --- End diff --
    
    It was not closing (I think) before as exception was swallowed since sendResponse in NIOServerCnxn
was not throwing IOException


> As NettyServerCnxn.sendResponse() allows all the exception to bubble up it can stop main
ZK requests processing thread
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2549
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2549
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.1
>            Reporter: Yuliya Feldman
>            Assignee: Yuliya Feldman
>         Attachments: ZOOKEEPER-2549-2.patch, ZOOKEEPER-2549-3.patch, ZOOKEEPER-2549-3.patch,
ZOOKEEPER-2549.patch, ZOOKEEPER-2549.patch, zookeeper-2549-1.patch
>
>
> As NettyServerCnxn.sendResponse() allows all the exception to bubble up it can stop main
ZK requests processing thread and make Zookeeper server look like it is hanging, while it
just can not process any request anymore.
> Idea is to catch all the exceptions in NettyServerCnxn.sendResponse() , convert them
to IOException and allow it propagating up



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