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Posted to dev@zookeeper.apache.org by "Patrick Hunt (JIRA)" <ji...@apache.org> on 2008/09/05 20:28:44 UTC
[jira] Created: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
sync causes hang in all followers of quorum
-------------------------------------------
Key: ZOOKEEPER-136
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
Project: Zookeeper
Issue Type: Bug
Affects Versions: 3.0.0
Reporter: Patrick Hunt
Assignee: Patrick Hunt
Fix For: 3.0.0
The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Attachment: (was: ZOOKEEPER-136.patch)
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Patrick Hunt (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Patrick Hunt updated ZOOKEEPER-136:
-----------------------------------
Attachment: testfails_ZOOKEEPER-136.patch
Ben please use this updated patch file for the basis of your fix.
This patch includes everything from the last patch except:
1) patched against latest svn head
2) cleans up a number of LOG messages, in particular adds a number of DEBUG level logs that help in tracking down issues when things go wrong.
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Patrick Hunt
> Fix For: 3.0.0
>
> Attachments: log_ZOOKEEPER-136.txt, testfails_ZOOKEEPER-136.patch, testfails_ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Commented: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628979#action_12628979 ]
Benjamin Reed commented on ZOOKEEPER-136:
-----------------------------------------
There are two problems in the code. First, the pendingSyncs hashtable assumes there will only be one pending request for a change operation. This is not a valid assumption. The syncHandler also assumes a single outstanding request for a given session since it removes the session handler from the table.
I think a fix needs to get rid of both hashtables since it is very hard to do reliably. Instead we should attach information to Request to hang triggers to a list of SyncRequests. We should also tuck away the FollowerHandle to talk to in a sync specific subclass of Request.
I tried doing the above and it worked out pretty well from a code understandability sense, but I still working on making test cases pass.
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Patrick Hunt
> Fix For: 3.0.0
>
> Attachments: log_ZOOKEEPER-136.txt, testfails_ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Attachment: ZOOKEEPER-136.patch
This patch includes the tests that Pat wrote and the fix for the problem.
The fix involves three things:
1) The leader creates a FollowerSyncRequest that contains a reference to the FollowerHandler doing the sync. This allows us to get rid of the handler hashmap.
2) The pendingSyncs uses a List to track multiple syncs per change
3) CommitRequest processor was changed to take a boolean to flag whether to wait for syncs to come from the leader.
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Patrick Hunt (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Patrick Hunt updated ZOOKEEPER-136:
-----------------------------------
Attachment: testfails_ZOOKEEPER-136.patch
The TestSync test fails on my ubuntu 1core laptop.
the test basically:
starts a 5 server quroum
starts a client against each server (so 5 clients)
each client does the following (async ops) on a node it owns:
1) create node
2) sync node
3) setdata node
4) sync node
5) delete node
6) sync node
7) wait for all results of ops 1-6 to complete
each client does this 100 times in a loop then exits
I am seeing that in most cases the client attached to the leader runs to
completion successfully.
However the clients attached to the followers stall out (eventually TIMEOUT) waiting for the 1) operation to return.
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Patrick Hunt
> Fix For: 3.0.0
>
> Attachments: testfails_ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Attachment: (was: ZOOKEEPER-136.patch)
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Attachment: ZOOKEEPER-136.patch
Fixed the comments suggested by Flavio. Updated the patch to trunk.
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Attachment: (was: testfails_ZOOKEEPER-136.patch)
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Flavio Paiva Junqueira (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Flavio Paiva Junqueira updated ZOOKEEPER-136:
---------------------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
+1, the patch is good. I have committed already.
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Commented: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Flavio Paiva Junqueira (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633371#action_12633371 ]
Flavio Paiva Junqueira commented on ZOOKEEPER-136:
--------------------------------------------------
This patch is great! It adds a FollowerSyncRequest class to represent in-flight sync operations, and it cleans up a bit the logic on the leader side. Now, there are several modifications related to debugging messages, which don't seem to be always related to the problem is this jira. This is fine, though. I just commented because they make the patch look a lot more complex than it really is.
Something I'd like to understand is the functionality of matchSyncs. Why do we need a boolean flag to decide whether to process or not? Is this to differentiate the processing of sync on a leader and on a follower? In any case, it is probably a good idea to insert a comment explaining.
The comment that leads the code of SyncTest.java seems to be copied from elsewhere. Should we remove it and replace with a more representative comment?
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Status: Patch Available (was: Open)
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Patrick Hunt (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Patrick Hunt updated ZOOKEEPER-136:
-----------------------------------
Status: Open (was: Patch Available)
Looks like some files are missing from the patch. In particular SyncTest.java, perhaps you need to svn add (them)?
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Status: Patch Available (was: Open)
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Status: Patch Available (was: Open)
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Assigned: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Patrick Hunt (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Patrick Hunt reassigned ZOOKEEPER-136:
--------------------------------------
Assignee: Benjamin Reed (was: Patrick Hunt)
Ben is working on the fix.
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: log_ZOOKEEPER-136.txt, testfails_ZOOKEEPER-136.patch, testfails_ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Flavio Paiva Junqueira (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Flavio Paiva Junqueira updated ZOOKEEPER-136:
---------------------------------------------
Status: Open (was: Patch Available)
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Attachment: (was: log_ZOOKEEPER-136.txt)
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Patrick Hunt (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Patrick Hunt updated ZOOKEEPER-136:
-----------------------------------
Attachment: log_ZOOKEEPER-136.txt
look at time index 2008-09-05 10:53:03,911
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Patrick Hunt
> Fix For: 3.0.0
>
> Attachments: log_ZOOKEEPER-136.txt, testfails_ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Commented: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Hudson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636808#action_12636808 ]
Hudson commented on ZOOKEEPER-136:
----------------------------------
Integrated in ZooKeeper-trunk #103 (See [http://hudson.zones.apache.org/hudson/job/ZooKeeper-trunk/103/])
.patch
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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[jira] Updated: (ZOOKEEPER-136) sync causes hang in all followers
of quorum
Posted by "Benjamin Reed (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/ZOOKEEPER-136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Reed updated ZOOKEEPER-136:
------------------------------------
Attachment: ZOOKEEPER-136.patch
Added missing SyncTest.
> sync causes hang in all followers of quorum
> -------------------------------------------
>
> Key: ZOOKEEPER-136
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-136
> Project: Zookeeper
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Patrick Hunt
> Assignee: Benjamin Reed
> Fix For: 3.0.0
>
> Attachments: ZOOKEEPER-136.patch
>
>
> The attached test causes all of the followers of a quorum to hang. Leader continues to function correctly.
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