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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2355) Ephemeral node is never deleted if follower fails while reading the proposal packet
Date Tue, 04 Jul 2017 05:33:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16073123#comment-16073123
] 

ASF GitHub Bot commented on ZOOKEEPER-2355:
-------------------------------------------

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

    https://github.com/apache/zookeeper/pull/112#discussion_r125391857
  
    --- Diff: src/java/main/org/apache/zookeeper/server/quorum/Learner.java ---
    @@ -390,6 +391,7 @@ else if (qp.getType() == Leader.SNAP) {
                                 + Long.toHexString(qp.getZxid()));
                         System.exit(13);
                     }
    +                zk.getZKDatabase().setlastProcessedZxid(qp.getZxid());
    --- End diff --
    
    @rakeshadr Created https://issues.apache.org/jira/browse/ZOOKEEPER-2833 to avoid this
gets lost.


> Ephemeral node is never deleted if follower fails while reading the proposal packet
> -----------------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2355
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2355
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: quorum, server
>    Affects Versions: 3.4.8, 3.4.9, 3.4.10, 3.5.1, 3.5.2, 3.5.3
>            Reporter: Mohammad Arshad
>            Assignee: Mohammad Arshad
>            Priority: Critical
>         Attachments: ZOOKEEPER-2355-01.patch, ZOOKEEPER-2355-02.patch, ZOOKEEPER-2355-03.patch,
ZOOKEEPER-2355-04.patch, ZOOKEEPER-2355-05.patch
>
>
> ZooKeeper ephemeral node is never deleted if follower fail while reading the proposal
packet
> The scenario is as follows:
> # Configure three node ZooKeeper cluster, lets say nodes are A, B and C, start all, assume
A is leader, B and C are follower
> # Connect to any of the server and create ephemeral node /e1
> # Close the session, ephemeral node /e1 will go for deletion
> # While receiving delete proposal make Follower B to fail with {{SocketTimeoutException}}.
This we need to do to reproduce the scenario otherwise in production environment it happens
because of network fault.
> # Remove the fault, just check that faulted Follower is now connected with quorum
> # Connect to any of the server, create the same ephemeral node /e1, created is success.
> # Close the session,  ephemeral node /e1 will go for deletion
> # {color:red}/e1 is not deleted from the faulted Follower B, It should have been deleted
as it was again created with another session{color}
> # {color:green}/e1 is deleted from Leader A and other Follower C{color}



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