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From "Gang Zhu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-832) Invalid session id causes infinite loop during automatic reconnect
Date Wed, 03 Jul 2019 01:50:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877411#comment-16877411

Gang Zhu commented on ZOOKEEPER-832:

Hi, I am facing the same issue. zookeeper.version=3.4.13. I am using zookeeper C client 3.5.5.
Is there any plan to commit this patch? Before this patch becomes available, is there any
work around from client's point of view? For example, is it possible for client to detect
this scenario and close the session? Thanks in advance.

> Invalid session id causes infinite loop during automatic reconnect
> ------------------------------------------------------------------
>                 Key: ZOOKEEPER-832
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-832
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.4.5, 3.5.0, 3.4.11
>         Environment: All
>            Reporter: Ryan Holmes
>            Assignee: Mohammad Arshad
>            Priority: Critical
>         Attachments: ZOOKEEPER-832.patch, ZOOKEEPER-832.patch, ZOOKEEPER-832.patch, ZOOKEEPER-832.patch,
ZOOKEEPER-832.patch, ZOOKEEPER-832.patch, ZOOKEEPER-832.patch, ZOOKEEPER-832.patch, ZOOKEEPER-832.patch,
> Steps to reproduce:
> 1.) Connect to a standalone server using the Java client.
> 2.) Stop the server.
> 3.) Delete the contents of the data directory (i.e. the persisted session data).
> 4.) Start the server.
> The client now automatically tries to reconnect but the server refuses the connection
because the session id is invalid. The client and server are now in an infinite loop of attempted
and rejected connections. While this situation represents a catastrophic failure and the current
behavior is not incorrect, it appears that there is no way to detect this situation on the
client and therefore no way to recover.
> The suggested improvement is to send an event to the default watcher indicating that
the current state is "session invalid", similar to how the "session expired" state is handled.
> Server log output (repeats indefinitely):
> 2010-08-05 11:48:08,283 - INFO  [NIOServerCxn.Factory:$Factory@250]
- Accepted socket connection from /
> 2010-08-05 11:48:08,284 - INFO  [NIOServerCxn.Factory:]
- Refusing session request for client / as it has seen zxid 0x44 our last zxid
is 0x0 client must try another server
> 2010-08-05 11:48:08,284 - INFO  [NIOServerCxn.Factory:]
- Closed socket connection for client / (no session established for client)
> Client log output (repeats indefinitely):
> 11:47:17 org.apache.zookeeper.ClientCnxn startConnect INFO line 1000 - Opening socket
connection to server localhost/
> 11:47:17 org.apache.zookeeper.ClientCnxn run WARN line 1120 - Session 0x12a3ae4e893000a
for server null, unexpected error, closing socket connection and attempting reconnect
> java.net.ConnectException: Connection refused
> 	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
> 	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574)
> 	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1078)
> 11:47:17 org.apache.zookeeper.ClientCnxn cleanup DEBUG line 1167 - Ignoring exception
during shutdown input
> java.nio.channels.ClosedChannelException
> 	at sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:638)
> 	at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
> 	at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1164)
> 	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1129)
> 11:47:17 org.apache.zookeeper.ClientCnxn cleanup DEBUG line 1174 - Ignoring exception
during shutdown output
> java.nio.channels.ClosedChannelException
> 	at sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:649)
> 	at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:368)
> 	at org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1171)
> 	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1129)

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