Do you expect the time to be "wrong" frequently? If ntp is running it should never get out of sync more than a small amount. As long as this is less than ~your timeout you should be fine.

Patrick

On 08/18/2010 01:04 AM, Qing Yan wrote:
Hi,

    The testcase is fairly simple. We have a client which connects to ZK,
registers an ephemeral node and watches on it. Now change the client
machine's time - session killed..

    Here is the log:

*2010-08-18 04:24:57,782 INFO
com.taobao.timetunnel2.cluster.service.AgentService: Host name
kgbtest1.corp.alimama.com
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:zookeeper.version=3.2.2-888565, built on 12/08/2009 21:51 GMT
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:host.name=kgbtest1.corp.alimama.com
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:java.version=1.6.0_13
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:java.vendor=Sun Microsystems Inc.
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:java.home=/usr/java/jdk1.6.0_13/jre
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:java.class.path=/home/admin/TimeTunnel2/cluster/bin/../conf/agent/:/home/admin/TimeTunnel2/cluster/bin/../lib/slf4j-log4j12-1.5.2.jar:/home/admin/TimeTunnel2/cluster/bin/../lib/slf4j-api-1.5.2.jar:/home/admin/TimeTunnel2/cluster/bin/../lib/timetunnel2-cluster-0.0.1-SNAPSHOT.jar:/home/admin/TimeTunnel2/cluster/bin/../lib/zookeeper-3.2.2.jar:/home/admin/TimeTunnel2/cluster/bin/../lib/log4j-1.2.14.jar:/home/admin/TimeTunnel2/cluster/bin/../lib/gson-1.4.jar:/home/admin/TimeTunnel2/cluster/bin/../lib/zk-recipes.jar
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:java.library.path=/usr/java/jdk1.6.0_13/jre/lib/amd64/server:/usr/java/jdk1.6.0_13/jre/lib/amd64:/usr/java/jdk1.6.0_13/jre/../lib/amd64:/usr/java/packages/lib/amd64:/lib:/usr/lib
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:java.io.tmpdir=/tmp
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:java.compiler=<NA>
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:os.name=Linux
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:os.arch=amd64
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:os.version=2.6.18-164.el5
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:user.name=admin
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:user.home=/home/admin
2010-08-18 04:24:57,789 INFO org.apache.zookeeper.ZooKeeper: Client
environment:user.dir=/home/admin/TimeTunnel2/cluster/log
2010-08-18 04:24:57,790 INFO org.apache.zookeeper.ZooKeeper: Initiating
client connection, connectString=xentest10-vm5.corp.alimama.com:2181,
xentest10-vm6.corp.alimama.com:2181,xentest10-vm9.corp.alimama.com:2181sessionTimeout=600000
watcher=com.taobao.timetunnel2.cluster.service.agentserv...@48d6c16c
2010-08-18 04:24:57,791 INFO org.apache.zookeeper.ClientCnxn:
zookeeper.disableAutoWatchReset is false
2010-08-18 04:24:57,817 INFO org.apache.zookeeper.ClientCnxn: Attempting
connection to server xentest10-vm5.corp.alimama.com/10.254.5.160:2181
2010-08-18 04:24:57,818 INFO org.apache.zookeeper.ClientCnxn: Priming
connection to java.nio.channels.SocketChannel[connected local=/
10.254.2.160:48536 remote=xentest10-vm5.corp.alimama.com/10.254.5.160:2181]
2010-08-18 04:24:57,821 INFO org.apache.zookeeper.ClientCnxn: Server
connection successful
2010-08-18 04:24:57,832 INFO
com.taobao.timetunnel2.cluster.service.AgentService: Register...
2010-08-18 04:24:57,834 DEBUG org.apache.zookeeper.ClientCnxn: Reading reply
sessionid:0x12a8413f71a0003, packet:: clientPath:null serverPath:null
finished:false header:: -8,101  replyHeader:: -8,-1,0  request::
0,v{},v{},v{}  response:: null
2010-08-18 04:24:57,846 DEBUG org.apache.zookeeper.ClientCnxn: Reading reply
sessionid:0x12a8413f71a0003, packet:: clientPath:null serverPath:null
finished:false header:: 1,1  replyHeader:: 1,8589934649,-110  request::
'/agent,,v{s{31,s{'world,'anyone}}},0  response::
2010-08-18 04:24:57,853 DEBUG
com.taobao.timetunnel2.cluster.zookeeper.operation.PathCreator: Path /agent
already exist
2010-08-18 04:24:57,882 DEBUG org.apache.zookeeper.ClientCnxn: Reading reply
sessionid:0x12a8413f71a0003, packet:: clientPath:null serverPath:null
finished:false header:: 2,1  replyHeader:: 2,8589934650,-110  request::
'/agent/status,,v{s{31,s{'world,'anyone}}},0  response::
2010-08-18 04:24:57,882 DEBUG
com.taobao.timetunnel2.cluster.zookeeper.operation.PathCreator: Path
/agent/status already exist
2010-08-18 04:24:57,886 DEBUG org.apache.zookeeper.ClientCnxn: Reading reply
sessionid:0x12a8413f71a0003, packet:: clientPath:null serverPath:null
finished:false header:: 3,1  replyHeader:: 3,8589934651,0  request::
'/agent/status/kgbtest1.corp.alimama.com,,v{s{31,s{'world,'anyone}}},1
response:: '/agent/status/kgbtest1.corp.alimama.com
2010-08-18 04:24:57,886 DEBUG
com.taobao.timetunnel2.cluster.zookeeper.operation.PathCreator: Path
/agent/status/kgbtest1.corp.alimama.com creation OK
2010-08-18 04:24:57,886 INFO
com.taobao.timetunnel2.cluster.service.AgentService: Watch for ->
/agent/status/kgbtest1.corp.alimama.com
2010-08-18 04:24:57,892 DEBUG org.apache.zookeeper.ClientCnxn: Reading reply
sessionid:0x12a8413f71a0003, packet:: clientPath:null serverPath:null
finished:false header:: 4,4  replyHeader:: 4,-1,0  request:: '/agent/status/
kgbtest1.corp.alimama.com,T  response::
,s{8589934651,8589934651,1282116165777,1282116165777,0,0,0,84024764344696835,0,0,8589934651}

2010-08-18 04:24:57,892 INFO
com.taobao.timetunnel2.cluster.service.AgentService: Data changed
@/agent/status/kgbtest1.corp.alimama.com
2010-08-18 04:25:11,226 DEBUG org.apache.zookeeper.ClientCnxn: Got ping
response for sessionid:0x12a8413f71a0003 after 1ms
2010-08-18 04:25:24,560 DEBUG org.apache.zookeeper.ClientCnxn: Got ping
response for sessionid:0x12a8413f71a0003 after 2ms
2010-08-18 04:25:37,893 DEBUG org.apache.zookeeper.ClientCnxn: Got ping
response for sessionid:0x12a8413f71a0003 after 1ms
2010-08-18 04:19:44,853 DEBUG org.apache.zookeeper.ClientCnxn: Got
notification sessionid:0x12a8413f71a0003
2010-08-18 04:19:44,854 DEBUG org.apache.zookeeper.ClientCnxn: Got
WatchedEvent: Znode change. Path:
/agent/status/kgbtest1.corp.alimama.comType: NodeDeleted for sessionid
0x12a8413f71a0003
2010-08-18 04:19:44,854 DEBUG
com.taobao.timetunnel2.cluster.zookeeper.operation.PathDataWatcher:
getChildren event =>WatchedEvent: Znode change. Path: /agent/status/
kgbtest1.corp.alimama.com Type: NodeDeleted
2010-08-18 04:19:44,855 WARN org.apache.zookeeper.ClientCnxn: Exception
closing session 0x12a8413f71a0003 to sun.nio.ch.selectionkeyi...@7ca3d4cf
java.io.IOException: Read error rc = -1 java.nio.DirectByteBuffer[pos=0
lim=4 cap=4]
     at
org.apache.zookeeper.ClientCnxn$SendThread.doIO(zookeeper:ClientCnxn.java):701)
     at
org.apache.zookeeper.ClientCnxn$SendThread.run(zookeeper:ClientCnxn.java):945)
2010-08-18 04:19:45,591 INFO org.apache.zookeeper.ClientCnxn: Attempting
connection to server xentest10-vm6.corp.alimama.com/10.254.5.161:2181
2010-08-18 04:19:45,591 INFO org.apache.zookeeper.ClientCnxn: Priming
connection to java.nio.channels.SocketChannel[connected local=/
10.254.2.160:45776 remote=xentest10-vm6.corp.alimama.com/10.254.5.161:2181]
2010-08-18 04:19:45,591 INFO org.apache.zookeeper.ClientCnxn: Server
connection successful
2010-08-18 04:19:45,593 WARN org.apache.zookeeper.ClientCnxn: Exception
closing session 0x12a8413f71a0003 to sun.nio.ch.selectionkeyi...@2fdb7df8
java.io.IOException: Session Expired
     at
org.apache.zookeeper.ClientCnxn$SendThread.readConnectResult(zookeeper:ClientCnxn.java):589)
     at
org.apache.zookeeper.ClientCnxn$SendThread.doIO(zookeeper:ClientCnxn.java):709)
     at
org.apache.zookeeper.ClientCnxn$SendThread.run(zookeeper:ClientCnxn.java):945)

*   I guess ZK might rely on timestamp to  keep sessions alive, but we have
NTP daemon running so machine time can get changed
automatically, is there a conflict?

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