[jira] Updated: (ZOOKEEPER-702) GSoC 2010: Failure Detector Model

[Flavio Junqueira (JIRA)]

 [ 
https://issues.apache.org/jira/browse/ZOOKEEPER-702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Flavio Junqueira updated ZOOKEEPER-702:
---

Status: Open  (was: Patch Available)

Thanks for the updated patch, Abmar. The new tests, however, are working as 
expected. More specifically, the methods in QuorumBase (createLearnersFD and 
createSessionsFD) are not being overridden as expected, which affects all new 
hammer tests. I haven't checked the other tests, but I suspect they suffer from 
the same problem.

I'm canceling the patch for now. 

 GSoC 2010: Failure Detector Model
 -

 Key: ZOOKEEPER-702
 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-702
 Project: Zookeeper
  Issue Type: Wish
Reporter: Henry Robinson
Assignee: Abmar Barros
 Attachments: bertier-pseudo.txt, bertier-pseudo.txt, chen-pseudo.txt, 
 chen-pseudo.txt, phiaccrual-pseudo.txt, phiaccrual-pseudo.txt, 
 ZOOKEEPER-702-code.patch, ZOOKEEPER-702-doc.patch, ZOOKEEPER-702.patch, 
 ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, 
 ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, 
 ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, 
 ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch


 Failure Detector Module
 Possible Mentor
 Henry Robinson (henry at apache dot org)
 Requirements
 Java, some distributed systems knowledge, comfort implementing distributed 
 systems protocols
 Description
 ZooKeeper servers detects the failure of other servers and clients by 
 counting the number of 'ticks' for which it doesn't get a heartbeat from 
 other machines. This is the 'timeout' method of failure detection and works 
 very well; however it is possible that it is too aggressive and not easily 
 tuned for some more unusual ZooKeeper installations (such as in a wide-area 
 network, or even in a mobile ad-hoc network).
 This project would abstract the notion of failure detection to a dedicated 
 Java module, and implement several failure detectors to compare and contrast 
 their appropriateness for ZooKeeper. For example, Apache Cassandra uses a 
 phi-accrual failure detector (http://ddsg.jaist.ac.jp/pub/HDY+04.pdf) which 
 is much more tunable and has some very interesting properties. This is a 
 great project if you are interested in distributed algorithms, or want to 
 help re-factor some of ZooKeeper's internal code.

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[jira] Commented: (ZOOKEEPER-823) update ZooKeeper java client to optionally use Netty for connections

[Flavio Junqueira (JIRA)]

[ 
https://issues.apache.org/jira/browse/ZOOKEEPER-823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=12914822#action_12914822
 ] 

Flavio Junqueira commented on ZOOKEEPER-823:


Here is another instance:

{noformat}
Testcase: testPathValidation took 1.865 sec
Caused an ERROR
KeeperErrorCode = ConnectionLoss for /chrootclienttest
org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = 
ConnectionLoss for /chrootclienttest
at org.apache.zookeeper.KeeperException.create(KeeperException.java:90)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:640)
at 
org.apache.zookeeper.test.ChrootClientTest.setUp(ChrootClientTest.java:42)
{noformat}

I'm on Mac OS X 1.5.8, java build 1.6.0_20-b02-279-9M3165.

 update ZooKeeper java client to optionally use Netty for connections
 

 Key: ZOOKEEPER-823
 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-823
 Project: Zookeeper
  Issue Type: New Feature
  Components: java client
Reporter: Patrick Hunt
Assignee: Patrick Hunt
 Fix For: 3.4.0

 Attachments: NettyNettySuiteTest.rtf, 
 TEST-org.apache.zookeeper.test.NettyNettySuiteTest.txt.gz, 
 ZOOKEEPER-823.patch, ZOOKEEPER-823.patch, ZOOKEEPER-823.patch, 
 ZOOKEEPER-823.patch, ZOOKEEPER-823.patch, ZOOKEEPER-823.patch, 
 ZOOKEEPER-823.patch


 This jira will port the client side connection code to use netty rather than 
 direct nio.

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