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[expand - 2 more] - Re: zookeeper leadership election example application - Zookeeper - [mail # user]
...The idea is that all the leader candidates try to create the same ephemeral file.  One wins.  That one is the winner.  On disconnect, that leader pauses its services.  On...
   Author: Ted Dunning, 2011-11-28, 16:41
[expand - 3 more] - Re: [VOTE] Release ZooKeeper 3.4.0 (candidate 2) - Zookeeper - [mail # dev]
...No promises, but I think that this is wonderful work and will see what I can liberate in terms of time.  On Fri, Nov 18, 2011 at 10:13 AM, Patrick Hunt  wrote:  ...
   Author: Ted Dunning, 2011-11-18, 22:55
[expand - 3 more] - Re: Missing session state handling in most Leader Election implementations - Zookeeper - [mail # user]
...Is the background sync even necessary?  The ZK client itself will re-establish connection if it can.  I think that LOST should only be sent on session expiration.  On Fri, Nov...
   Author: Ted Dunning, 2011-11-18, 17:52
Re: zookeeper ensemble with hbase (versus single node) - Zookeeper - [mail # user]
...Yes.  It is nice to still have a valid indicator of what is up and down after a critical node goes down.  This is independent of hbase.  If you have a system with a critical f...
   Author: Ted Dunning, 2011-11-11, 17:37
Re: setting zookeeper heap size - Zookeeper - [mail # user]
...The behavior without xmx is actually pretty reasonable.  Note that the default of half is only up to a few hundred MB of memory (not GB).  Even when lots of memory is allocated, th...
   Author: Ted Dunning, 2011-11-11, 04:59
Re: Question regarding the maximum number of ZNODES a zookeeper - Zookeeper - [mail # user]
...Each node can take a fair bit of overhead in memory.   That 2G you allocated may not go as far as you might like.  I am a bit surprised if this eats as much memory as your test see...
   Author: Ted Dunning, 2011-11-10, 05:07
[expand - 1 more] - Re: Design question - Zookeeper - [mail # user]
...Been there!  Having both in memory is the ideal world scenario.  Some days we have to live in the real world.  The chapter 16 example may still help.  That example is ava...
   Author: Ted Dunning, 2011-11-09, 19:28
[expand - 1 more] - Re: Will zookeeper server merge some watcher notifications? - Zookeeper - [mail # user]
...Yes.  Check the documentation about Watches.  Particular the part that says that you can't be sure to have one notification per change.  http://zookeeper.apache.org/doc/r3.1.2...
   Author: Ted Dunning, 2011-11-07, 03:56
Re: Why doesn't create() return a Stat object? - Zookeeper - [mail # user]
...On Fri, Nov 4, 2011 at 9:54 AM, Mark Libucha  wrote:   It mostly has to do with sequential files.  They get a name that you didn't pass in.    API changes are very p...
   Author: Ted Dunning, 2011-11-04, 17:00
[expand - 2 more] - Re: Comment from Martin Fowler - Zookeeper - [mail # dev]
...On Wed, Nov 2, 2011 at 11:23 AM, Patrick Hunt  wrote:    Indeed.  And language issues.  And cultural history.  And software cultural differences.  Who know...
   Author: Ted Dunning, 2011-11-02, 18:26
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB