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Re: leader election, scheduled tasks, losing leadership - Zookeeper - [mail # user]
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...If your ConnectionStateListener gets SUSPENDED or LOST you've lost connection to ZooKeeper. Therefore you cannot use that same ZooKeeper connection to manage a node that denotes the process ...
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Author: Jordan Zimmerman,
2012-12-09, 05:18
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Re: leader election, scheduled tasks, losing leadership - Zookeeper - [mail # user]
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...This is why you need a ConnectionStateListener. You'll get a notice that the connection has been suspended and you should assume all locks/leaders are invalid. -JZ On Dec 8, 2012...
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Author: Jordan Zimmerman,
2012-12-09, 05:04
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Re: leader election, scheduled tasks, losing leadership - Zookeeper - [mail # user]
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...The leader latch lock is the equivalent of task in progress. I assume the task is running in the same VM as the leader lock. The only reason the VM would lose leadership is if it crashes in ...
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Author: Jordan Zimmerman,
2012-12-09, 05:00
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Re: leader election, scheduled tasks, losing leadership - Zookeeper - [mail # user]
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...lol - I have an open bug for LeaderLatch. hasLeadership() is returning true when the cluster becomes unstable: https://github.com/Netflix/curator/issues/216 - In any event, you should regist...
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Author: Jordan Zimmerman,
2012-12-09, 04:57
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Re: leader election, scheduled tasks, losing leadership - Zookeeper - [mail # user]
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...You might check your leader implementation. Writing a correct leader recipe is actually quite challenging due to edge cases. Have a look at Curator (disclosure: I wrote it) for an example. &...
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Author: Jordan Zimmerman,
2012-12-09, 04:52
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Re: leader election, scheduled tasks, losing leadership - Zookeeper - [mail # user]
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...Why would it lose leadership? The only reason I can think of is if the ZK cluster goes down. In normal use, the ZK cluster won't go down (I assume you're running 3 or 5 instances). -JZ...
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Author: Jordan Zimmerman,
2012-12-09, 04:25
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Re: Is there any online tool to monitor/maintain Zookeeper - Zookeeper - [mail # user]
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...Exhibitor: https://github.com/Netflix/exhibitor On Dec 6, 2012, at 10:36 PM, Zeng Lames wrote: ...
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Author: Jordan Zimmerman,
2012-12-07, 07:04
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Re: Embedded ZK instance for unit testing - Zookeeper - [mail # user]
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...Curator has a test ZK server and cluster: curator-test =================== Jordan Zimmerman On Dec 3, 2012, at 11:39 AM, Joshua Blatt wrote: ...
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Author: Jordan Zimmerman,
2012-12-03, 19:44
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Re: Exhibitor rewrote my zoo.cfg with bad configuration - Zookeeper - [mail # user]
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...Exhibitor's main raison d'être is to manage zoo.cfg. I'm not sure why you'd use Exhibitor if you wanted to manually manage zoo.cfg. However, if you turn instance restarts off for all your in...
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Author: Jordan Zimmerman,
2012-11-29, 19:50
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Re: Exhibitor rewrote my zoo.cfg with bad configuration - Zookeeper - [mail # user]
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...FYI - Exhibitor has its own group: http://groups.google.com/group/exhibitor-users You can turn off Instance Restarts for any instance from the Exhibitor control panel. -JZ ...
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Author: Jordan Zimmerman,
2012-11-29, 19:18
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