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From Benjamin Jaton <bja...@radiantlogic.com>
Subject Curator never goes through when ZK is read-only
Date Mon, 11 Jul 2016 23:01:37 GMT
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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