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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 Thu, 13 Jul 2017 06:13:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16085239#comment-16085239
] 

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

Github user asdf2014 commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/304#discussion_r127135317
  
    --- Diff: src/java/test/org/apache/zookeeper/server/quorum/EphemeralNodeDeletionTest.java
---
    @@ -0,0 +1,219 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.zookeeper.server.quorum;
    +
    +import static org.apache.zookeeper.test.ClientBase.CONNECTION_TIMEOUT;
    +import static org.junit.Assert.assertNotNull;
    +import static org.junit.Assert.assertNull;
    +
    +import java.io.IOException;
    +import java.net.SocketTimeoutException;
    +
    +import org.apache.zookeeper.CreateMode;
    +import org.apache.zookeeper.PortAssignment;
    +import org.apache.zookeeper.ZooDefs.Ids;
    +import org.apache.zookeeper.ZooKeeper;
    +import org.apache.zookeeper.data.Stat;
    +import org.apache.zookeeper.server.persistence.FileTxnSnapLog;
    +import org.apache.zookeeper.server.quorum.QuorumPeer.ServerState;
    +import org.apache.zookeeper.test.ClientBase;
    +import org.apache.zookeeper.test.ClientBase.CountdownWatcher;
    +import org.junit.After;
    +import org.junit.Assert;
    +import org.junit.Test;
    +
    +import javax.security.sasl.SaslException;
    +
    +public class EphemeralNodeDeletionTest extends QuorumPeerTestBase {
    +    private static int SERVER_COUNT = 3;
    +    private MainThread[] mt = new MainThread[SERVER_COUNT];
    +
    +    /**
    +     * Test case for https://issues.apache.org/jira/browse/ZOOKEEPER-2355.
    +     * ZooKeeper ephemeral node is never deleted if follower fail while reading
    +     * the proposal packet.
    +     */
    +
    +    @Test(timeout = 120000)
    +    public void testEphemeralNodeDeletion() throws Exception {
    +        final int clientPorts[] = new int[SERVER_COUNT];
    +        StringBuilder sb = new StringBuilder();
    +        String server;
    +
    +        for (int i = 0; i < SERVER_COUNT; i++) {
    +            clientPorts[i] = PortAssignment.unique();
    +            server = "server." + i + "=127.0.0.1:" + PortAssignment.unique()
    +                    + ":" + PortAssignment.unique();
    +            sb.append(server + "\n");
    --- End diff --
    
    @hanm Okay, After this patch merged, i will do the refactoring work in a separate `JIRA`.
I understand we should put more attentions into the high priority tasks, thank you for explaining
this. :D


> 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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