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Date: Sun, 28 Jul 2013 14:39:49 +0000 (UTC)
From: "Jimmy Xiang (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12660141.1374875544198.125581.1375022389220@arcas>
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Subject: [jira] [Commented] (HBASE-9050) HBaseClient#call could hang
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    [ https://issues.apache.org/jira/browse/HBASE-9050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13721955#comment-13721955 ] 

Jimmy Xiang commented on HBASE-9050:
------------------------------------

[~saint.ack@gmail.com], are you ok with 1000ms, since it is rare?
                
> HBaseClient#call could hang
> ---------------------------
>
>                 Key: HBASE-9050
>                 URL: https://issues.apache.org/jira/browse/HBASE-9050
>             Project: HBase
>          Issue Type: Bug
>          Components: Client
>    Affects Versions: 0.94.10
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>            Priority: Minor
>         Attachments: 0.94-9050.patch
>
>
> In HBaseClient#call, we have
> {code}
>     connection.sendParam(call);                 // send the parameter
>     boolean interrupted = false;
>     //noinspection SynchronizationOnLocalVariableOrMethodParameter
>     synchronized (call) {
>       while (!call.done) {
>         try {
>           call.wait();                           // wait for the result
> {code}
> sendParam could do nothing if the connection is closed right after the call is added into the queue.  Since the connection is closed, we won't get any response, therefore, we won't get any notify call.  So we will keep waiting here for something won't happen.

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