[jira] [Comment Edited] (ZOOKEEPER-4376) Zookeeper should not warn about "An exception was thrown while closing send thread"

["Geert Pante (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-4376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17554179#comment-17554179 ] 

Geert Pante edited comment on ZOOKEEPER-4376 at 6/14/22 3:55 PM:
-----------------------------------------------------------------

This is indeed very annoying. We found it out after upgrading from zookeeper client 3.5 to 3.6. Now we see this error once or twice whenever a client tool ends.

+1 to change it back to DEBUG. In the commit, there was no explanation why it was changed to WARN, and I don't see any valid reasons myself.

In [https://github.com/apache/zookeeper/pull/1889/files] , they changed a similar issue to INFO, but that was server-side, so less relevant.


was (Author: greyfairer):
This is indeed very annoying. We found it out after upgrading from zookeeper client 3.5 to 3.6. Now we see this error once or twice whenever a client tool ends.

+1 to change it back to DEBUG. In the commit, there was no explanation why it was changed to WARN, and I don't see any valid reasons myself.

> Zookeeper should not warn about "An exception was thrown while closing send thread"
> -----------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-4376
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4376
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: java client
>    Affects Versions: 3.6.2
>            Reporter: Gaspard Petit
>            Priority: Minor
>
> In commit [https://github.com/apache/zookeeper/commit/11c07921c15e2fb7692375327b53f26a583b77ca] the message printed when closing a connection to Zookeeper was changed from being logged as a debug message to a warning message.  The comment next to the message confirms that this is "expected" and therefore, it seems unjustified to use a warning level. 
> Can we tune this down back to debug (or info) level? I would not mind submitting a pull request if there is consensus.
> The full error we are seeing is the following:
>  
> {{An exception was thrown while closing send thread for session 0x1067b8748f00775.}}
>  
> with stack strace:
> {{EndOfStreamException: Unable to read additional data from server sessionid 0x1067b8748f00775, likely server has closed socket at org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:77) at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350) at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1280)}}
>  



--
This message was sent by Atlassian Jira
(v8.20.7#820007)