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Re: cluster member was switched to standalone, detectable? - Zookeeper - [mail # user]
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...The 'srvr' command lists what mode the instance thinks it's in. Unfortunately, you have to manually parse it. If there's a quorum issue it outputs something like "This ZooKeeper is not servi...
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Author: Jordan Zimmerman,
2012-05-18, 20:57
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Re: cluster member was switched to standalone, detectable? - Zookeeper - [mail # user]
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...ZooKeeper has a telnet style interface for periodic querying. You could also use Exhibitor and query it's REST API periodically. I should probably add alerting to Exhibitor for this ki...
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Author: Jordan Zimmerman,
2012-05-18, 18:51
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FYI - Deadlock analysis with Exhibitor - Zookeeper - [mail # user]
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...FYI Exhibitor has a new feature: deadlock detection. It can look at a set of ZN odes that implement a lock recipe and determine if there's a potential dead lock. Details here: ht...
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Author: Jordan Zimmerman,
2012-05-17, 23:15
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Re: SaslAuthenticated - Zookeeper - [mail # user]
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...Never mind - https://issues.apache.org/jira/browse/ZOOKEEPER-1437 fixes the issue From: Netflix > Date: Thu, 17 May 2012 00:23:08 -0700 To: > Subject: SaslAuthenticated &nb...
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Author: Jordan Zimmerman,
2012-05-17, 16:50
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SaslAuthenticated - Zookeeper - [mail # user]
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...When using SASL authentication, waiting for SysConnected isn't enough. Clie nts need to wait for SaslAuthenticated as well before calling ZK methods. I s there a way for a library such as Cu...
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Author: Jordan Zimmerman,
2012-05-17, 07:23
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[ZOOKEEPER-1440] Spurious log error messages when QuorumCnxManager is shutting down - Zookeeper - [issue]
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...When shutting down the QuroumPeer, ZK server logs unnecessary errors. See QuorumCnxManager.Listener.run() - ss.accept() will throw an exception when it is closed. The catch (IOException e) w...
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http://issues.apache.org/jira/browse/ZOOKEEPER-1440
Author: Jordan Zimmerman,
2012-05-16, 06:49
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Re: curator leader election and thread usage - Zookeeper - [mail # user]
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...I've decided to add an alternate version of leader selection that doesn't use threads. It will behave somewhat like a CountDownLatch so I'm calling it LeaderLatch. I'll report back (only on ...
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Author: Jordan Zimmerman,
2012-05-10, 17:37
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Re: Watch not sent immediately? - Zookeeper - [mail # user]
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...Interesting - this issue has come up several times with Curator users. I ended up writing a Tech Note on it. https://github.com/Netflix/curator/wiki/Tech-Note-1 -JZ On 5/9...
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Author: Jordan Zimmerman,
2012-05-09, 20:27
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Re: Zookeeper multiserver setup? - Zookeeper - [mail # user]
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...For most uses, 3 instances is enough. For heavy usage, 5 instances can be used. ZooKeeper write performance degrades with the number of instances added. There's a lot of doc on the net about...
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Author: Jordan Zimmerman,
2012-05-08, 22:19
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Re: Zookeeper multiserver setup? - Zookeeper - [mail # user]
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...You have 9 instances? That's a lot. Why so many? I believe the "Node" field in the stat is the number of ZKNodes, not instances in the ensemble. That stat looks good. It means that tha...
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Author: Jordan Zimmerman,
2012-05-08, 22:05
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