mail archive zookeeper-user.hadoop.apache.org
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zookeeper-user.hadoop.apache.org
July 2010
Rakhi Khatwani — 127799006701 Jul 2010
Hi, I wanna use solr cloud. i downloaded the code from the trunk, and successfully executed the examples as shown in wiki. but when i try the same wit...
Zookeeper outage recap & questions (3 Replies)
Travis Crawford — 127800303901 Jul 2010*
Hey zookeepers - We just experienced a total zookeeper outage, and here's a quick post-mortem of the issue, and some questions about preventing it...
Bryan Thompson — 127800539501 Jul 2010*
Hello, I am wondering what guarantees (if any) zookeeper provides for reliable messaging for operation return codes up to a session timeout. Basically...
zookeeper crash (11 Replies)
Charity Majors — 127846073206 Jul 2010*
I upgraded my zookeeper cluster last week from 3.2.1 to 3.3.1, in an attempt to get away from a client bug that was crashing my backend services. Unfo...
Lakshman — 127853534907 Jul 2010*
Hi Everyone, We are using zookeeper 3.3.1. And more frequently we are hitting CancelledKeyException after startup of application. Average response tim...
Jeremy Davis — 127861525508 Jul 2010*
Is there a recommended way of simulating a client session expiration in unit tests? I see a TestableZooKeeper.java, with a pauseCnxn() method that doe...
running the systest (3 Replies)
Stuart Halloway — 127870283809 Jul 2010*
Hi all, I am trying to run the systest and have hit a few minor issues: (1) The readme says src/contrib/jarjar, apparently should be src/contrib/fatja...
Regarding Leader election and the limit on number of clients without performance degradation (3 Replies)
Srikanth Bondalapati: — 127897244612 Jul 2010*
Hi, I am using ZooKeeper service for leader election and group management. I have read in the site ( http://hadoop.apache.org/zookeeper/docs/r3.2....)...
building client tools (6 Replies)
Martin Waite — 127910994214 Jul 2010*
Hi, I am trying to build the c client on debian lenny for zookeeper 3.3.1. autoreconf -if configure.ac:33: warning: macro `AM_PATH_CPPUNIT' not fo...
ZkClient package (3 Replies)
Jun Rao — 127912934614 Jul 2010*
Hi, ZkClient (http://github.com/sgroschupf/zkclient) provides a nice wrapper around the ZooKeeper client and handles things like retry during Connecti...
What does this exception mean? (1 Reply)
Avinash Lakshman — 127914025914 Jul 2010*
Hi All I run into this periodically. I am curious to know what this means, why would this happen and how am I to react to it programmatically. org.apa...
total # of zknodes (3 Replies)
Maarten Koopmans — 127921385615 Jul 2010*
Hi, I am mapping a filesystem to ZooKeeper, and use it for locking and mapping a filesystem namespace to a flat data object space (like S3). So assumi...
Achieving quorum with only half of the nodes (9 Replies)
Sergei Babovich — 127921821715 Jul 2010*
Hi, We are currently evaluating use of ZK in our infrastructure. In our setup we have a set of servers running from two different power feeds. If one ...
Errors with Python bindings (3 Replies)
Rich Schumacher — 127929626716 Jul 2010*
I'm running a Tornado webserver and using ZooKeeper to store some metadata and occasionally the ZooKeeper connection will error out irrevocably. A...
cleanup ZK takes 40-60 seconds (1 Reply)
Vishal K — 127933300717 Jul 2010*
Hi, We have embedded ZK server in our application. We start a thread in our application and call QuorumPeerMain.InitializeArgs(). When cleaning-up ZK ...
Benjamin Reed — 127933953417 Jul 2010
how big is your database? it would be good to know the timing of the two calls. shutdown should take very little time. sent from my droid -Original Me...
Srikanth Bondalapati: — 127958053419 Jul 2010*
Hi, I have a class (X) that implements the Watcher Interface. Consider, an instance of 'X' is registered as a callback object for different Zn...
JMX error while starting ZooKeeper (1 Reply)
Rakesh Aggarwal — 127958530120 Jul 2010*
Hi Folks, I am setting up a HBase cluster for pseudo-distributed environment using CDH3 on RedHat Linux. I am getting the following exception while tr...
BookKeeper Doubts (2 Replies)
André Oriani — 127959749720 Jul 2010*
Hi, I was not sure if I had understood the behavior of BookKeeper from documentation. So I made a little program, reproduced below, to see what BookKe...
does a ZK client read its own write (2 Replies)
Jun Rao — 127964158220 Jul 2010*
Hi, In ZK, a read is handled by any server while a write is broadcasted from the leader. If a client writes x to /X and then reads /X, is the client g...
Logger hierarchies in ZK? (3 Replies)
ewhauser — 127968139921 Jul 2010*
Has anyone experimented with storing logger hierarchies in ZK? I'm looking for a mechanism to dynamically change logger settings across a cluster ...
André Oriani — 127972146921 Jul 2010*
Hi folks, I was considering using Zookeeper to implement a replication protocol due the global order guarantee. In my case, operations are logged by c...
ZK recovery questions (9 Replies)
Ashwin Jayaprakash — 127973064621 Jul 2010*
Hi, I've been reading the docs and trying out some basic Zookeeper examples. I have a few simple questions related to recovery. It would be good t...
Adding observers (6 Replies)
Avinash Lakshman — 127973526921 Jul 2010*
Hi All I have two questions regarding Observers in ZK. (1) Is it possible to increase the number of observers in the cluster dynamically? (2) How many...
Joshua Ball — 127974892521 Jul 2010*
Hi, Do implementations of Watcher need to be thread-safe, or can I assume that process(...) will always be called by the same thread? Thanks, Josh ...
total # nodes (1 Reply)
Maarten Koopmans — 127999928724 Jul 2010*
Hi, Relating to the previous question: is there a quick way to get the total # nodes in a Zookeeper cluster (so I can determine utilization)? Best, Ma...
node symlinks (8 Replies)
Maarten Koopmans — 128017951726 Jul 2010*
Hi, I have a number of nodes that will grow larger than one cluster can hold, so I am looking for a way to efficiently stack clusters. One way is to h...