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From Benjamin Jaton <benjamin.ja...@gmail.com>
Subject Re: ZK read-only issue
Date Thu, 28 Jul 2016 23:56:30 GMT
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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