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From Benjamin Jaton <bja...@radiantlogic.com>
Subject Re: Curator never goes through when ZK is read-only
Date Mon, 11 Jul 2016 23:10:55 GMT
ZK is 3.5.1-alpha
Curator is 2.11.0

On Mon, Jul 11, 2016 at 4:01 PM, Benjamin Jaton <bjaton@radiantlogic.com>
wrote:

> I have a 3 nodes ZK cluster , readonly mode is enabled.
> 2 nodes are down, so the third one is in read-only (verified by using the
> ZK API manually).
>
> I'm using this piece of code:
>
> Builder curatorClientBuilder = CuratorFrameworkFactory.builder()
> .connectString("QA-E8WIN11:2181,QA-E8WIN12:2181")
> .sessionTimeoutMs(45000).connectionTimeoutMs(15000)
> .retryPolicy(new RetryNTimes(3, 5000)).canBeReadOnly(true);
>
> CuratorFramework client = curatorClientBuilder.build();
> client.start();
> client.getZookeeperClient().blockUntilConnectedOrTimedOut();
> System.out.println("Successfully established the connection with
> ZooKeeper");
> client.getData().forPath("/");
> System.out.println("Done.");
>
> When curator pick the host that is UP first, it goes through very quickly.
> When it picks the host that is down first (QA-E8WIN12), it never goes
> through.
>
> Am I missing something here?
>
> Below is the log:
>
> 2016-07-11 15:46:45,733 INFO
>  org.apache.curator.framework.imps.CuratorFrameworkImpl:235 - Starting
> 2016-07-11 15:46:45,743 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:zookeeper.version=3.5.1-alpha-1748895, built on 06/17/2016
> 22:24 GMT
> 2016-07-11 15:46:45,743 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:host.name=w-rli09-ben
> 2016-07-11 15:46:45,744 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:java.version=1.8.0_11
> 2016-07-11 15:46:45,744 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:java.vendor=Oracle Corporation
> 2016-07-11 15:46:45,744 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:java.home=/usr/local/apps/jdk1.8.0_11/jre
> 2016-07-11 15:46:45,744 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:java.class.path=(..)
> 2016-07-11 15:46:45,746 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:java.io.tmpdir=/tmp
> 2016-07-11 15:46:45,746 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:java.compiler=<NA>
> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:os.name=Linux
> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:os.arch=amd64
> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:os.version=3.8.0-44-generic
> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:user.name=benji
> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:user.home=(..)
> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:user.dir=(..)
> 2016-07-11 15:46:45,747 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:os.memory.free=385MB
> 2016-07-11 15:46:45,748 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:os.memory.max=5358MB
> 2016-07-11 15:46:45,748 INFO  org.apache.zookeeper.ZooKeeper:109 - Client
> environment:os.memory.total=397MB
> 2016-07-11 15:46:45,750 INFO  org.apache.zookeeper.ZooKeeper:716 -
> Initiating client connection, connectString=QA-E8WIN11:2181,QA-E8WIN12:2181
> sessionTimeout=45000 watcher=org.apache.curator.ConnectionState@3e96bacf
> 2016-07-11 15:46:45,769 INFO  org.apache.zookeeper.ClientCnxn:1138 -
> Opening socket connection to server QA-E8WIN12/10.11.8.232:2181. Will not
> attempt to authenticate using SASL (unknown error)
> Successfully established the connection with ZooKeeper
> 2016-07-11 15:47:08,300 INFO  org.apache.zookeeper.ClientCnxn:1251 -
> Client session timed out, have not heard from server in 22534ms for
> sessionid 0x0, closing socket connection and attempting reconnect
> 2016-07-11 15:47:08,403 INFO  org.apache.zookeeper.ClientCnxn:1138 -
> Opening socket connection to server QA-E8WIN11/10.11.8.236:2181. Will not
> attempt to authenticate using SASL (unknown error)
> 2016-07-11 15:47:08,406 INFO  org.apache.zookeeper.ClientCnxn:980 - Socket
> connection established, initiating session, client: /10.11.12.4:47004,
> server: QA-E8WIN11/10.11.8.236:2181
> 2016-07-11 15:47:08,413 INFO  org.apache.zookeeper.ClientCnxn:1400 -
> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
> sessionid = 0x100024f0936005b, negotiated timeout = 45000 (READ-ONLY mode)
> 2016-07-11 15:47:08,415 INFO  org.apache.zookeeper.ClientCnxn:1297 -
> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 200
> 2016-07-11 15:47:08,420 INFO
>  org.apache.curator.framework.state.ConnectionStateManager:228 - State
> change: READ_ONLY
> 2016-07-11 15:49:15,712 INFO  org.apache.zookeeper.ClientCnxn:1253 -
> Unable to read additional data from server sessionid 0x100024f0936005b,
> likely server has closed socket, closing socket connection and attempting
> reconnect
> 2016-07-11 15:49:15,815 INFO
>  org.apache.curator.framework.state.ConnectionStateManager:228 - State
> change: SUSPENDED
> 2016-07-11 15:49:17,313 INFO  org.apache.zookeeper.ClientCnxn:1138 -
> Opening socket connection to server QA-E8WIN11/10.11.8.236:2181. Will not
> attempt to authenticate using SASL (unknown error)
> 2016-07-11 15:49:17,314 INFO  org.apache.zookeeper.ClientCnxn:980 - Socket
> connection established, initiating session, client: /10.11.12.4:47295,
> server: QA-E8WIN11/10.11.8.236:2181
> 2016-07-11 15:49:17,316 INFO  org.apache.zookeeper.ClientCnxn:1400 -
> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
> sessionid = 0x100024f0936005f, negotiated timeout = 45000 (READ-ONLY mode)
> 2016-07-11 15:49:17,316 INFO  org.apache.zookeeper.ClientCnxn:1297 -
> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 400
> 2016-07-11 15:49:17,316 INFO
>  org.apache.curator.framework.state.ConnectionStateManager:228 - State
> change: READ_ONLY
> 2016-07-11 15:51:24,607 INFO  org.apache.zookeeper.ClientCnxn:1253 -
> Unable to read additional data from server sessionid 0x100024f0936005f,
> likely server has closed socket, closing socket connection and attempting
> reconnect
> 2016-07-11 15:51:24,713 INFO
>  org.apache.curator.framework.state.ConnectionStateManager:228 - State
> change: SUSPENDED
> 2016-07-11 15:51:26,467 INFO  org.apache.zookeeper.ClientCnxn:1138 -
> Opening socket connection to server QA-E8WIN11/10.11.8.236:2181. Will not
> attempt to authenticate using SASL (unknown error)
> 2016-07-11 15:51:26,468 INFO  org.apache.zookeeper.ClientCnxn:980 - Socket
> connection established, initiating session, client: /10.11.12.4:47576,
> server: QA-E8WIN11/10.11.8.236:2181
> 2016-07-11 15:51:26,470 INFO  org.apache.zookeeper.ClientCnxn:1400 -
> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
> sessionid = 0x100024f09360061, negotiated timeout = 45000 (READ-ONLY mode)
> 2016-07-11 15:51:26,470 INFO  org.apache.zookeeper.ClientCnxn:1297 -
> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 800
> 2016-07-11 15:51:26,470 INFO
>  org.apache.curator.framework.state.ConnectionStateManager:228 - State
> change: READ_ONLY
> (...)
>
> Thanks
> Ben
>
>

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