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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2977) Concurrency for addAuth corrupts quorum packets
Date Mon, 11 Jun 2018 16:15:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16508281#comment-16508281

Hadoop QA commented on ZOOKEEPER-2977:

+1 overall.  GitHub Pull Request  Build

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 2 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 3.0.1) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/1823//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/1823//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-ZOOKEEPER-github-pr-build/1823//console

This message is automatically generated.

> Concurrency for addAuth corrupts quorum packets
> -----------------------------------------------
>                 Key: ZOOKEEPER-2977
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2977
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: quorum
>    Affects Versions: 3.4.9
>         Environment: Affects all version in 3.4.x
>            Reporter: sumit agrawal
>            Assignee: sumit agrawal
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 3.4.13
>         Attachments: 2977.patch
>          Time Spent: 10m
>  Remaining Estimate: 0h
> When client performs multiple times addAuth with different credential at follower concurrently,
the communication between follower gets corrupt. This causes shutdown of Follower due to the
> Analysis:
> In org.apache.zookeeper.server.quorum.QuorumPacket.serialize method,
>  * call a_.startVector(authinfo,"authinfo"); which write the length of authinfo to packet
(suppose it writes length 1)
>  * get length of authinfo to write all details in loop (here gets length as 2)
> <-- Here in concurrency scenario, buffer gets corrupt having extra bytes in channel
for additional authinfo.
> So When Leader reads next quorum packet, it reads previous extra bytes (incorrect) and
possibly identify greater size of message (as corrupt byte pattern) causes exception...
> Coordination > Unexpected exception causing shutdown while sock still open (LearnerHandler.java:633)
>  java.io.IOException: Unreasonable length = 1885430131
> ServerCnxn.getAuthInfo returns Unmodifiable list, but while addAuthInfo, there is no
check. So this causes concurrency issue.

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