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From Flavio Junqueira <...@apache.org>
Subject Re: ZK read-only issue
Date Thu, 28 Jul 2016 23:59:11 GMT
I think you're hitting this:

https://issues.apache.org/jira/browse/ZOOKEEPER-2466 <https://issues.apache.org/jira/browse/ZOOKEEPER-2466>

which is resolved for 3.5.3 and trunk. You can try out the patch.

-Flavio

> On 29 Jul 2016, at 00:56, Benjamin Jaton <benjamin.jaton@gmail.com> wrote:
> 
> OK so I did another fresh install this time using 3.5.2-alpha, and the read
> only client doesn't seem to try all the hosts available.
> 
> I create my client with:
> ZooKeeper zk = new ZooKeeper("10.11.9.70:2181,10.11.12.4:2181,
> 10.11.12.210:2181", 45000, this, true);
> 
> In the following output, it only checks for 10.11.12.4:2181 and
> 10.11.12.210:2181, but it doesn't try 10.11.9.70:2181 which is where the
> running server is.
> 
> 0 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:zookeeper.version=3.5.2-alpha-1753710, built on 07/21/2016
> 16:24 GMT
> 1 [main] INFO org.apache.zookeeper.ZooKeeper  - Client environment:host.name
> =w-rli09-ben
> 1 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:java.version=1.8.0_11
> 1 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:java.vendor=Oracle Corporation
> 1 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:java.home=/usr/local/apps/jdk1.8.0_11/jre
> 1 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:java.class.path=/home/benji/workspace-trunk/testzkclient/bin:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/commons-cli-1.2.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/jackson-core-asl-1.9.11.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/jackson-mapper-asl-1.9.11.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/javacc.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/jetty-6.1.26.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/jetty-util-6.1.26.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/jline-2.11.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/log4j-1.2.17.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/netty-3.10.5.Final.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/servlet-api-2.5-20081211.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/slf4j-api-1.7.5.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/lib/slf4j-log4j12-1.7.5.jar:/home/benji/workspace-trunk/zookeeper-3.5.2/build/zookeeper-3.5.2-alpha.jar
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:java.io.tmpdir=/tmp
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:java.compiler=<NA>
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client environment:os.name
> =Linux
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:os.arch=amd64
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:os.version=3.8.0-44-generic
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client environment:user.name
> =benji
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:user.home=/home/benji
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:user.dir=/home/benji/workspace-trunk/testzkclient
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:os.memory.free=376MB
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:os.memory.max=5358MB
> 2 [main] INFO org.apache.zookeeper.ZooKeeper  - Client
> environment:os.memory.total=378MB
> *8 [main] INFO org.apache.zookeeper.ZooKeeper  - Initiating client
> connection, connectString=10.11.9.70:2181
> <http://10.11.9.70:2181>,10.11.12.4:2181
> <http://10.11.12.4:2181>,10.11.12.210:2181 <http://10.11.12.210:2181>
> sessionTimeout=45000 watcher=testzkclient.TestZkReadOnlyClient@5010be6*
> 21 [main] DEBUG org.apache.zookeeper.ClientCnxnSocket  - jute.maxbuffer is
> 4194304
> Successfully established the connection with ZooKeeper
> *37 [main-SendThread(10.11.12.4:2181 <http://10.11.12.4:2181>)] INFO
> org.apache.zookeeper.ClientCnxn  - Opening socket connection to server
> 10.11.12.4/10.11.12.4:2181 <http://10.11.12.4/10.11.12.4:2181>. Will not
> attempt to authenticate using SASL (unknown error)*
> 43 [main-SendThread(10.11.12.4:2181)] WARN org.apache.zookeeper.ClientCnxn
> - Session 0x0 for server null, unexpected error, closing socket connection
> and attempting reconnect
> java.net.ConnectException: Connection refused
>    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>    at
> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:712)
>    at
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:357)
>    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1214)
> 45 [main-SendThread(10.11.12.4:2181)] DEBUG
> org.apache.zookeeper.ClientCnxnSocketNIO  - Ignoring exception during
> shutdown input
> java.nio.channels.ClosedChannelException
>    at
> sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:775)
>    at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:402)
>    at
> org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:198)
>    at
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1325)
>    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1245)
> 45 [main-SendThread(10.11.12.4:2181)] DEBUG
> org.apache.zookeeper.ClientCnxnSocketNIO  - Ignoring exception during
> shutdown output
> java.nio.channels.ClosedChannelException
>    at
> sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:792)
>    at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:410)
>    at
> org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:205)
>    at
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1325)
>    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1245)
> *149 [main-SendThread(10.11.12.210:2181 <http://10.11.12.210:2181>)] INFO
> org.apache.zookeeper.ClientCnxn  - Opening socket connection to server
> 10.11.12.210/10.11.12.210:2181 <http://10.11.12.210/10.11.12.210:2181>.
> Will not attempt to authenticate using SASL (unknown error)*
> 150 [main-SendThread(10.11.12.210:2181)] WARN
> org.apache.zookeeper.ClientCnxn  - Session 0x0 for server null, unexpected
> error, closing socket connection and attempting reconnect
> java.net.ConnectException: Connection refused
>    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>    at
> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:712)
>    at
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:357)
>    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1214)
> 150 [main-SendThread(10.11.12.210:2181)] DEBUG
> org.apache.zookeeper.ClientCnxnSocketNIO  - Ignoring exception during
> shutdown input
> java.nio.channels.ClosedChannelException
>    at
> sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:775)
>    at sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:402)
>    at
> org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:198)
>    at
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1325)
>    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1245)
> 150 [main-SendThread(10.11.12.210:2181)] DEBUG
> org.apache.zookeeper.ClientCnxnSocketNIO  - Ignoring exception during
> shutdown output
> java.nio.channels.ClosedChannelException
>    at
> sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:792)
>    at sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:410)
>    at
> org.apache.zookeeper.ClientCnxnSocketNIO.cleanup(ClientCnxnSocketNIO.java:205)
>    at
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1325)
>    at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1245)
> *Exception in thread "main"
> org.apache.zookeeper.KeeperException$ConnectionLossException:
> KeeperErrorCode = ConnectionLoss for /*
>    at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>    at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>    at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1956)
>    at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1985)
>    at testzkclient.TestZkReadOnlyClient.run(TestZkReadOnlyClient.java:26)
>    at testzkclient.TestZkReadOnlyClient.main(TestZkReadOnlyClient.java:13)
> 
> 
> Does anybody else have issues with the readonly mode?
> 
> Thanks
> Benjamin
> 
> 
> On Sat, Jul 16, 2016 at 7:39 PM, Benjamin Jaton <benjamin.jaton@gmail.com>
> wrote:
> 
>> Very interesting, thank you Flavio.
>> 
>> That should not happen because I have actually never started (even never
>> created) the other servers. This server is the first one the client could
>> have possibly ever seen. Maybe the server has to have been in a functioning
>> ensemble at least once before being able to be read only able?
>> I will recheck all my setup and do it again.
>> Thanks again,
>> Ben
>> 
>> On Wed, Jul 13, 2016 at 2:06 PM, Flavio Junqueira <fpj@apache.org> wrote:
>> 
>>> From the logs, it looks like the server the client is trying to connect
>>> to is behind compared to last zxid the client has seen:
>>> 
>>>        Refusing session request for client /10.11.12.4:49237 as it has
>>> seen zxid 0x3 our last zxid is 0x0 client must try another server
>>> 
>>> I believe the behavior we currently have is that a client can connect to
>>> an RO server, but the server must have a view at least as recent as the
>>> server.
>>> 
>>> -Flavio
>>> 
>>>> On 12 Jul 2016, at 16:23, Benjamin Jaton <benjamin.jaton@gmail.com>
>>> wrote:
>>>> 
>>>> Hello,
>>>> 
>>>> I'm having problems using ZK in read-only mode.
>>>> I am using a fresh install of ZK 3.5.1-alpha where I configure the
>>> installation to be in a 3 nodes ensemble.
>>>> I start this node only (QA-E8WIN11) with -Dreadonlymode.enabled=true.
>>>> 
>>>> I see that the node QA-E8WIN11 starts the RO server properly:
>>>> 2016-07-12 16:10:10,955 [myid:1] - INFO
>>> [Thread-4:ReadOnlyZooKeeperServer@73] - Read-only server started
>>>> 
>>>> Then I make a read-only enabled client:
>>>> 
>>>>        ZooKeeper zk = new
>>> ZooKeeper("QA-E8WIN12:2181,QA-E8WIN13:2181,QA-E8WIN11:2181", 45000, this,
>>> true);
>>>>        System.out.println("Successfully established the connection
>>> with ZooKeeper");
>>>> 
>>>>        zk.getData("/", false, null);
>>>>        System.out.println("Done.");
>>>> 
>>>> Note that only QA-E8WIN11 is started, the other 2 are not.
>>>> 
>>>> When the ZK client picks QA-E8WIN11 first, it works.
>>>> But when it picks a different node, it fails with:
>>>> 
>>>> 16:10:13.338 org.apache.zookeeper.ZooKeeper:716 - Initiating client
>>> connection, connectString=QA-E8WIN12:2181,QA-E8WIN13:2181,QA-E8WIN11:2181
>>> sessionTimeout=45000 watcher=TestZkReadOnly@68de145
>>>> Successfully established the connection with ZooKeeper
>>>> 16:10:13.475 org.apache.zookeeper.ClientCnxn:1138 - Opening socket
>>> connection to server QA-E8WIN13/10.11.8.230:2181 <
>>> http://10.11.8.230:2181/>. Will not attempt to authenticate using SASL
>>> (unknown error)
>>>> 16:10:28.469 org.apache.zookeeper.ClientCnxn:1251 - Client session
>>> timed out, have not heard from server in 15001ms for sessionid 0x0, closing
>>> socket connection and attempting reconnect
>>>> 16:10:28.574 org.apache.zookeeper.ClientCnxn:1138 - Opening socket
>>> connection to server QA-E8WIN12/10.11.8.232:2181 <
>>> http://10.11.8.232:2181/>. Will not attempt to authenticate using SASL
>>> (unknown error)
>>>> Exception in thread "main"
>>> org.apache.zookeeper.KeeperException$ConnectionLossException:
>>> KeeperErrorCode = ConnectionLoss for /
>>>>    at
>>> org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>>>>    at
>>> org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>>>>    at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1753)
>>>>    at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1782)
>>>>    at TestZkReadOnly.run(TestZkReadOnly.java:26)
>>>>    at TestZkReadOnly.main(TestZkReadOnly.java:16)
>>>> 
>>>> I'm attaching all the logs. The server and the client are on the same
>>> machine QA-E8WIN11.
>>>> 
>>>> Any help would be greatly appreciated!
>>>> 
>>>> Thanks,
>>>> Benjamin Jaton
>>>> <zkclient.log><zkserver.log>
>>> 
>>> 
>> 


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