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495 discussions - 2,468 posts

  • We are now officially an Apache TLP! http://bit.ly/9czN2x As part of the process for moving out from under Hadoop and into full TLP status we need to work through the following ...
    Patrick HuntPatrick Hunt
    Nov 22, 2010 at 6:28 pm
    Nov 22, 2010 at 7:29 pm
  • I was just asked a very cogent question of the form "how do you know" and would like somebody who knows better than I do to confirm or deny my response. The only part that I am absolutely sure of is ...
    Ted DunningTed Dunning
    Nov 20, 2010 at 10:28 pm
    Nov 20, 2010 at 10:28 pm
  • At canonical we've been using zookeeper heavily in the development of a new project (ensemble) as noted by gustavo. I just wanted to give a quick overview of the client library we're using for it ...
    Kapil ThangaveluKapil Thangavelu
    Nov 18, 2010 at 9:17 pm
    Nov 19, 2010 at 10:55 pm
  • Hello again, Even though we've been using ZooKeeper for some time, just now we're stopping and thinking through to see how to best deal with session events in the context of a whole application. To ...
    Gustavo NiemeyerGustavo Niemeyer
    Nov 18, 2010 at 6:26 pm
    Nov 19, 2010 at 1:52 am
  • I had a question about number of clients against a zookeeper cluster. I was looking at having between 10,000 and 100,000 (towards 100,000) watchers within a single datacenter at a given time ...
    Jeremy HannaJeremy Hanna
    Nov 18, 2010 at 5:14 pm
    Nov 19, 2010 at 12:22 am
  • Greetings, As some of you already know, we've been using ZooKeeper at Canonical for a project we've been pushing (Ensemble, http://j.mp/dql6Fu). We've already written down txzookeeper ...
    Gustavo NiemeyerGustavo Niemeyer
    Nov 18, 2010 at 3:23 pm
    Nov 19, 2010 at 8:15 pm
  • Hello everyone ,I met a problem recently in my app. First an error “2010-11-17 09:45:00,089 INFO zookeeper.ClientCnxn Client session timed out, have not heard from server in 3090ms for sessionid ...
    Nov 17, 2010 at 2:11 am
    Nov 17, 2010 at 2:11 am
  • Hi all, I would like to customize the config of Zookeeper so that when a client is disconnected, the server will instantaneously remove all ephemeral nodes associated with the client. No wait for ...
    Steve GurySteve Gury
    Nov 16, 2010 at 2:04 pm
    Nov 16, 2010 at 3:20 pm
  • Hi. It's been a couple of weeks since we started integrating zookeeper into our app. Great piece of software. Cut down LOC by more than half. Thank you for open sourcing Zookeeper. I have a couple of ...
    Chang SongChang Song
    Nov 13, 2010 at 3:17 am
    Nov 13, 2010 at 7:08 am
  • The Apache ZooKeeper team is proud to announce Apache ZooKeeper version 3.3.2 ZooKeeper is a high-performance coordination service for distributed applications. It exposes common services - such as ...
    Patrick HuntPatrick Hunt
    Nov 12, 2010 at 5:52 pm
    Nov 12, 2010 at 5:52 pm
  • Hi All... Long time reader... First time writer... Hehe... I am curious to know what successes people have had with verifying zookeeper changes across a pool of clients. I.E. Being able to verify ...
    Ben HallBen Hall
    Nov 10, 2010 at 2:42 am
    Nov 10, 2010 at 7:02 pm
  • Anyone know of a good blog post or docs anywhere that gives a simple example of Watchers in action? I saw the one on: http://hadoop.apache.org/zookeeper/docs/current/javaExample.html#ch_Introduction ...
    Jeremy HannaJeremy Hanna
    Nov 9, 2010 at 7:34 pm
    Nov 16, 2010 at 4:35 am
  • I wanted to highlight a couple recent JIRAs that may have impact on users (api consumers AND admins of the service) in the 3.4 timeframe. If you want to weigh in please comment on the respective ...
    Patrick HuntPatrick Hunt
    Nov 9, 2010 at 6:24 pm
    Nov 9, 2010 at 6:24 pm
  • My question is - what is the right way to received notification once a znode is created? My scenario is that I have two threads, one (thread A) is going to save data to hdfs, another thread (thread ...
    Neo AndersonNeo Anderson
    Nov 6, 2010 at 11:50 am
    Nov 13, 2010 at 7:55 am
  • What are the key factors for production readiness of Hedwig? I would really like to use Hedwig in some major projects; but having a production readiness stamp is important. For my perspective: (a) ...
    Milind ParikhMilind Parikh
    Nov 6, 2010 at 3:08 am
    Nov 10, 2010 at 7:08 pm
  • Hi all, I'm new to Zookeeper and ran into an issue while trying to run the tests with ant. It seems like the log output is buffered until the complete test suite finishes and it is flushed into its ...
    András KöviAndrás Kövi
    Nov 4, 2010 at 10:33 am
    Nov 5, 2010 at 9:08 am
  • What would be expected behavior if a three node cluster is put behind a load balancer? It would ease deployment because all clients would be configured to target zookeeper.example.com regardless of ...
    Luka StojanovicLuka Stojanovic
    Nov 3, 2010 at 7:19 pm
    Nov 5, 2010 at 10:01 am
  • Hi, I am trying to understand hedwig. I tried reading the documentation user.txt, dev.txt along with the code but still some design aspects are not clear. Can someone please tell the following: (Lets ...
    Amit jaiswalAmit jaiswal
    Nov 3, 2010 at 6:07 am
    Nov 17, 2010 at 5:36 am
  • Nice to see this! Thanks mahadev ------ Forwarded Message From: Apache Wiki <wikidiffs@apache.org Reply-To: <common-dev@hadoop.apache.org Date: Tue, 2 Nov 2010 14:39:24 -0700 To: Apache Wiki ...
    Mahadev KonarMahadev Konar
    Nov 2, 2010 at 10:54 pm
    Nov 2, 2010 at 10:54 pm
  • Hi, I started a 5-node zookeeper cluster, then killed the leader (leader1). One of the other server became the new leader(leader2). After that, I restarted the former leader (leader1), and it failed ...
    Ruifang GeRuifang Ge
    Nov 1, 2010 at 7:10 pm
    Nov 1, 2010 at 9:51 pm
  • HI everyone, Is there any situation in which creating a new ZK node with the SEQUENCE flag should result in a "node exists" error? I'm seeing this happening after a failure of a ZK node that appeared ...
    Jeremy StriblingJeremy Stribling
    Oct 29, 2010 at 1:08 am
    Nov 3, 2010 at 7:24 pm
  • I'm trying to debug an issue that maybe you fellas have some ideas for figuring. In short: Client 1 updates a znode setting its content to X, then X again, then Y, and then finally it deletes the ...
    Michael StackMichael Stack
    Oct 28, 2010 at 9:39 pm
    Oct 29, 2010 at 5:54 am
  • Hi all, We are setting up a small Hadoop 13 node cluster running 1 HDFS master, 9 region severs for HBase and 3 map reduce nodes, and are just installing zookeeper to perform the HBase coordination ...
    Tim RobertsonTim Robertson
    Oct 28, 2010 at 9:53 am
    Nov 1, 2010 at 6:59 pm
  • Hi, I am trying to configure zookeeper cluster ... with 2 server instances. zookeeper version : 3.2.2 Config files are : *Server 1. zoo.cfg* tickTime=2000 initLimit=10 syncLimit=5 ...
    Siddhartha banikSiddhartha banik
    Oct 27, 2010 at 1:22 pm
    Oct 27, 2010 at 6:40 pm
  • Hi, In hedwig, how many publishers can publish to a particular topic simultaneously. Any concerns / important points on message ordering? -regards Amit
    Amit jaiswalAmit jaiswal
    Oct 26, 2010 at 5:33 pm
    Oct 26, 2010 at 5:33 pm
  • Read requests are handled locally at each Zookeeper server. So it is possible for a read request to return a stale value even though a more recent update to the same znode has been committed. Does ...
    Jingguo yaoJingguo yao
    Oct 24, 2010 at 4:04 am
    Oct 25, 2010 at 7:34 pm
  • Hi, There is a class BookKeeperTools that has methods for complete recovery of a node. The recovery of dead bookie involves updating zk first with the replacement bookie and then replicating the ...
    Amit jaiswalAmit jaiswal
    Oct 22, 2010 at 8:13 am
    Oct 22, 2010 at 8:13 am
  • Hi, In BookKeeper documentation, the sample program creates a ledger, writes some entries and then *closes* the ledger. Then a client program opens the ledger, and reads the entries from it. Is it ...
    Amit jaiswalAmit jaiswal
    Oct 22, 2010 at 5:22 am
    Oct 22, 2010 at 7:42 am
  • Hi, Is it possible to read znodes directly from snapshot and log files instead of usign ZooKeeper API. In case a ZK ensemble is not available, can I login to all available nodes and run a utility ...
    Vishal KVishal K
    Oct 21, 2010 at 9:31 pm
    Oct 25, 2010 at 6:58 pm
  • Can a lost znode be recovered automatically? Say, in a 3 znodes Zookeeper cluster, the cluster get into a critical status if a znode is lost. If I bring that lost znode back into running, can it ...
    Sean BigdatafunSean Bigdatafun
    Oct 21, 2010 at 4:09 pm
    Oct 21, 2010 at 4:36 pm
  • join
    Sean BigdatafunSean Bigdatafun
    Oct 21, 2010 at 3:59 pm
    Oct 21, 2010 at 3:59 pm
  • The ZK documentation says: New in 3.2: Enables a ZooKeeper ensemble administrator to access the znode hierarchy as a "super" user. In particular no ACL checking occurs for a user authenticated as ...
    Fournier, Camille F. [Tech]Fournier, Camille F. [Tech]
    Oct 19, 2010 at 8:02 pm
    Oct 20, 2010 at 7:54 pm
  • Just as a thought experiment, I was pondering the following: ZK stamps each change to its managed state with a zxid (http://hadoop.apache.org/zookeeper/docs/r3.2.1/zookeeperInternals.html). That ID ...
    Sandy PrattSandy Pratt
    Oct 19, 2010 at 6:33 pm
    Oct 20, 2010 at 6:11 pm
  • hi, all I have a simple zk client written by c ,which is attachment #1. When i use ZOO_CREATOR_ALL_ACL, the ret code of zoo_create is -114((Invalid ACL specified definde in zookeeper.h)), but after i ...
    FANG YangFANG Yang
    Oct 19, 2010 at 6:51 am
    Oct 20, 2010 at 2:34 am
  • Anyone have any pointers on how to test against ZK outside of the source distribution? All the fun classes (e.g. ClientBase) do not make it into the ZK release jar. Right now I am manually running a ...
    Anthony UrsoAnthony Urso
    Oct 18, 2010 at 2:22 pm
    Oct 18, 2010 at 6:26 pm
  • Anyone have any pointers on how to test against ZK outside of the source distribution? All the fun classes (e.g. ClientBase) do not make it into the ZK release jar. Right now I am manually running a ...
    Anthony UrsoAnthony Urso
    Oct 15, 2010 at 1:17 am
    Oct 15, 2010 at 1:17 am
  • I started seeing a bunch of these exceptions. What do these mean? 2010-10-13 14:01:33,426 - WARN [NIOServerCxn.Factory:] - EndOfStreamException: Unable to read ...
    Avinash LakshmanAvinash Lakshman
    Oct 13, 2010 at 9:49 pm
    Oct 31, 2010 at 3:36 pm
  • Hi, What is the best approach to have an idempotent create() operation for a sequential node? Suppose a client is trying to create a sequential node and it gets a ConnectionLoss KeeperException, it ...
    Vishal KVishal K
    Oct 12, 2010 at 7:11 pm
    Oct 25, 2010 at 6:49 pm
  • This is what I have going: I have a bunch of 200 nodes come up and create an ephemeral entry under a znode names /Membership. When nodes are detected dead the node associated with the dead node under ...
    Avinash LakshmanAvinash Lakshman
    Oct 12, 2010 at 4:54 pm
    Oct 13, 2010 at 7:00 pm
  • I see this exception and the servers not doing anything. java.io.IOException: Channel eof at org.apache.zookeeper.server.quorum.QuorumCnxManager$RecvWorker.run(QuorumCnxManager.java:630) ERROR - ...
    Avinash LakshmanAvinash Lakshman
    Oct 10, 2010 at 3:18 pm
    Oct 13, 2010 at 6:57 pm
  • Hi all, I'm new to ZooKeeper and i have to implement Leader Election using it. I've read lots of information about, and i'm following the pseudo-code available at ...
    Oct 8, 2010 at 2:31 pm
    Oct 8, 2010 at 2:37 pm
  • hi all, I am a newbie of zookeeper and want to know whether zookeeper is suitable for my application. If it does, then I will try to learn more about it. My problem can be described as a ...
    Li LiLi Li
    Oct 8, 2010 at 10:31 am
    Oct 8, 2010 at 5:29 pm
  • Suppose I have a 3 node ZK cluster composed of machines A, B and C. Now for whatever reason I lose C forever and the machine needs to be replaced. How do I handle this situation? Update the config ...
    Avinash LakshmanAvinash Lakshman
    Oct 7, 2010 at 4:50 am
    Oct 7, 2010 at 9:48 pm
  • Hi All Are snapshots serialized dumps of the DataTree taken whenever a log rolls over? So when a server goes down and comes back up does it construct the data tree from the snapshots? What if I am ...
    Avinash LakshmanAvinash Lakshman
    Oct 7, 2010 at 3:12 am
    Oct 7, 2010 at 4:18 pm
  • Vishal the attachment seems to be getting removed by the list daemon (I don't have it), can you create a JIRA and attach? Also this is a good question for the ppl on zookeeper-user. (ccing) You are ...
    Patrick HuntPatrick Hunt
    Oct 6, 2010 at 8:46 pm
    Oct 7, 2010 at 5:09 pm
  • Hi, In Hedwig talk (http://vimeo.com/13282102), it was mentioned that the primary use case for Hedwig comes from the distributed key-value store PNUTS in Yahoo!, but also said that the work is new ...
    Amit jaiswalAmit jaiswal
    Oct 6, 2010 at 5:33 am
    Oct 9, 2010 at 3:10 am
  • The ZK "create" method explicitly states in the documentation "If the parent node does not exist in the ZooKeeper, a KeeperException with error code KeeperException.NoNode will be thrown." ( ...
    David RosenstrauchDavid Rosenstrauch
    Oct 5, 2010 at 10:20 pm
    Oct 7, 2010 at 4:08 pm
  • Hi, I just wondered: has anybody ever ran zookeeper "to the max" on a 68GB quadruple extra large high memory EC2 instance? With, say, 60GB allocated or so? Because EC2 with EBS is a nice way to grow ...
    Maarten KoopmansMaarten Koopmans
    Oct 5, 2010 at 6:04 pm
    Oct 5, 2010 at 10:02 pm
  • I find this happening in my observers node in the logs. The observers are running in a different data center from where the ZK non-observers are running. The only way to fix this seems to be ...
    Avinash LakshmanAvinash Lakshman
    Oct 5, 2010 at 3:11 pm
    Oct 6, 2010 at 8:37 pm
  • I was asked to post this to the user list after attend the ACM talk by Louis Pascal. One of several technologies combined to build and deploy their whole stack in 5 minutes (also presented by ...
    Jay TobiasJay Tobias
    Oct 5, 2010 at 2:16 am
    Oct 5, 2010 at 4:28 am
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