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From Benjamin Jaton <benjamin.ja...@gmail.com>
Subject Re: Curator never goes through when ZK is read-only
Date Tue, 12 Jul 2016 18:30:59 GMT
More to the story:

While it consistently works on the same machine than the sole running ZK
node when I specify only 2 of the 3 servers in the connection string,
it doesn't work when I specify 3 hosts:


2016-07-12 11:23:46 INFO  o.a.z.ZooKeeper:716 - Initiating client
connection, connectString=QA-E8WIN11:2181,QA-E8WIN12:2181,QA-E8WIN13:2181
sessionTimeout=45000 watcher=org.apache.curator.ConnectionState@c86b9e3
2016-07-12 11:23:46 INFO  o.a.z.ClientCnxn:1138 - Opening socket connection
to server QA-E8WIN13/10.11.8.230:2181. Will not attempt to authenticate
using SASL (unknown error)
2016-07-12 11:24:01 INFO  o.a.z.ClientCnxn:1251 - Client session timed out,
have not heard from server in 15018ms for sessionid 0x0, closing socket
connection and attempting reconnect
Successfully established the connection with ZooKeeper
2016-07-12 11:24:01 INFO  o.a.z.ClientCnxn:1138 - Opening socket connection
to server QA-E8WIN12/10.11.8.232:2181. Will not attempt to authenticate
using SASL (unknown error)
2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:1251 - Client session timed out,
have not heard from server in 15000ms for sessionid 0x0, closing socket
connection and attempting reconnect
2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:1138 - Opening socket connection
to server QA-E8WIN11/10.11.8.236:2181. Will not attempt to authenticate
using SASL (unknown error)
2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:980 - Socket connection
established, initiating session, client: /10.11.8.236:50423, server:
QA-E8WIN11/10.11.8.236:2181
2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:1400 - Session establishment
complete on server QA-E8WIN11/10.11.8.236:2181, sessionid =
0x10003c8af64001b, negotiated timeout = 45000 (READ-ONLY mode)
2016-07-12 11:24:16 INFO  o.a.z.ClientCnxn:1297 - Checking server
QA-E8WIN13/10.11.8.230:2181 for being r/w. Timeout 200
2016-07-12 11:24:16 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
change: READ_ONLY
2016-07-12 11:24:37 INFO  o.a.z.ClientCnxn:1297 - Checking server
QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 400
2016-07-12 11:24:58 INFO  o.a.z.ClientCnxn:1251 - Client session timed out,
have not heard from server in 42023ms for sessionid 0x10003c8af64001b,
closing socket connection and attempting reconnect
2016-07-12 11:24:58 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
change: SUSPENDED
2016-07-12 11:25:00 INFO  o.a.z.ClientCnxn:1138 - Opening socket connection
to server QA-E8WIN11/10.11.8.236:2181. Will not attempt to authenticate
using SASL (unknown error)
2016-07-12 11:25:00 INFO  o.a.z.ClientCnxn:980 - Socket connection
established, initiating session, client: /10.11.8.236:50428, server:
QA-E8WIN11/10.11.8.236:2181
2016-07-12 11:25:00 INFO  o.a.z.ClientCnxn:1400 - Session establishment
complete on server QA-E8WIN11/10.11.8.236:2181, sessionid =
0x10003c8af64001c, negotiated timeout = 45000 (READ-ONLY mode)
2016-07-12 11:25:00 INFO  o.a.z.ClientCnxn:1297 - Checking server
QA-E8WIN13/10.11.8.230:2181 for being r/w. Timeout 800
2016-07-12 11:25:00 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
change: READ_ONLY
2016-07-12 11:25:21 INFO  o.a.z.ClientCnxn:1297 - Checking server
QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 1600
2016-07-12 11:25:42 INFO  o.a.z.ClientCnxn:1251 - Client session timed out,
have not heard from server in 42011ms for sessionid 0x10003c8af64001c,
closing socket connection and attempting reconnect
2016-07-12 11:25:42 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
change: SUSPENDED
2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:1138 - Opening socket connection
to server QA-E8WIN11/10.11.8.236:2181. Will not attempt to authenticate
using SASL (unknown error)
2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:980 - Socket connection
established, initiating session, client: /10.11.8.236:50435, server:
QA-E8WIN11/10.11.8.236:2181
2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:1400 - Session establishment
complete on server QA-E8WIN11/10.11.8.236:2181, sessionid =
0x10003c8af64001d, negotiated timeout = 45000 (READ-ONLY mode)
2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:1297 - Checking server
QA-E8WIN13/10.11.8.230:2181 for being r/w. Timeout 3200
2016-07-12 11:25:44 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
change: READ_ONLY
2016-07-12 11:26:05 INFO  o.a.z.ClientCnxn:1297 - Checking server
QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 6400
2016-07-12 11:26:26 INFO  o.a.z.ClientCnxn:1251 - Client session timed out,
have not heard from server in 42003ms for sessionid 0x10003c8af64001d,
closing socket connection and attempting reconnect
2016-07-12 11:26:26 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
change: SUSPENDED
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.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:310)
    at
org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:299)
    at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:108)
    at
org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:295)
    at
org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:287)
    at
org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:34)
    at test.Test.main(Test.java:25)


That seems to suggest that adding 1 host to check somehow messes up
something in the timeouts.
I am suspicious of those:
2016-07-12 11:25:44 INFO  o.a.z.ClientCnxn:1297 - Checking server
QA-E8WIN13/10.11.8.230:2181 for being r/w. Timeout 3200
They seem to be "blocking" the existing connection we have to the healthy
ZK server, which goes stale. Is that possible?


On Tue, Jul 12, 2016 at 11:17 AM, Benjamin Jaton <bjaton@radiantlogic.com>
wrote:

> I did not use the zkCli tool but the ZK java API directly. And other tools
> like ZooInspector (contrib). They were run from a remote machine.
> I ran it on the same machine and the one read only server is running
> properly, I can browse it using those methods.
>
> Trying to make sense of those client-server interactions is difficult but
> here is what I got:
>
> Client:
> 2016-07-12 10:55:01,508 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)
> 2016-07-12 10:55:01,512 INFO  org.apache.zookeeper.ClientCnxn:980 - *Socket
> connection established*, initiating session, client: /10.11.12.4:60586,
> server: QA-E8WIN11/10.11.8.236:2181
> 2016-07-12 10:55:01,521 INFO  org.apache.zookeeper.ClientCnxn:1400 - *Session
> establishment complete on server QA-E8WIN11*/10.11.8.236:2181, *sessionid
> = 0x10003c8af640007*, negotiated timeout = 45000 (READ-ONLY mode)
> 2016-07-12 10:55:01,523 INFO  org.apache.zookeeper.ClientCnxn:1297 -
> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 200
> 2016-07-12 10:55:01,528 INFO
>  org.apache.curator.framework.state.ConnectionStateManager:228 - *State
> change: READ_ONLY*
> 2016-07-12 10:57:08,800 INFO  org.apache.zookeeper.ClientCnxn:1253 - *Unable
> to read additional data from server sessionid 0x10003c8af640007, likely
> server has closed socket, closing socket connection and attempting
> reconnect*
> 2016-07-12 10:57:08,903 INFO
>  org.apache.curator.framework.state.ConnectionStateManager:228 - *State
> change: SUSPENDED*
>
>
> Server:
> 2016-07-12T10:55:56,468 [myid:] - INFO  [ProcessThread(sid:1
> cport:-1)::ZooKeeperServer@678] - *Established session 0x10003c8af640007
> with negotiated timeout 45000* for client /10.11.12.4:60586
> (...)
> 2016-07-12T10:56:41,756 [myid:] - INFO  [SessionTracker:ZooKeeperServer@384]
> - *Expiring session 0x10003c8af640007, timeout of 45000ms exceeded*
>
>
> Note: Don't worry about the time being about 1 min off between the
> machines.
>
> What I don't understand is why we are losing the read-only connection we
> successfully established. ZK ro server says it timed out?
>
> Now interestingly, when I run it on the same machine it works and
> completes pretty quickly:
>
>
> 2016-07-12 10:43:49 INFO  o.a.z.ZooKeeper:716 - Initiating client
> connection, connectString=QA-E8WIN11:2181,QA-E8WIN12:2181
> sessionTimeout=45000 watcher=org.apache.curator.ConnectionState@e4487af
> 2016-07-12 10:43:49 INFO  o.a.z.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
> 2016-07-12 10:44:10 WARN  o.a.z.ClientCnxn:1257 - Session 0x0 for server
> null, unexpected error, closing socket connection and attempting reconnect
> java.net.ConnectException: Connection timed out: no further information
> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[?:1.8.0_91]
> at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
> ~[?:1.8.0_91]
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:355)
> ~[zookeeper-3.5.0-alpha.jar:3.5.2-alpha-SNAPSHOT-1702518]
> at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1236)
> [zookeeper-3.5.0-alpha.jar:3.5.2-alpha-SNAPSHOT-1702518]
> 2016-07-12 10:44:11 INFO  o.a.z.ClientCnxn:1138 - Opening socket
> connection to server QA-E8WIN11/10.11.8.236:2181. Will not attempt to
> authenticate using SASL (unknown error)
> 2016-07-12 10:44:11 INFO  o.a.z.ClientCnxn:980 - Socket connection
> established, initiating session, client: /10.11.8.236:50147, server:
> QA-E8WIN11/10.11.8.236:2181
> 2016-07-12 10:44:11 INFO  o.a.z.ClientCnxn:1400 - Session establishment
> complete on server QA-E8WIN11/10.11.8.236:2181, sessionid =
> 0x10003b315b30012, negotiated timeout = 45000 (READ-ONLY mode)
> 2016-07-12 10:44:11 INFO  o.a.z.ClientCnxn:1297 - Checking server
> QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 200
> 2016-07-12 10:44:11 INFO  o.a.c.f.s.ConnectionStateManager:228 - State
> change: READ_ONLY
> 2016-07-12 10:44:32 INFO  o.a.z.ClientCnxn:1297 - Checking server
> QA-E8WIN11/10.11.8.236:2181 for being r/w. Timeout 400
> Done.
>
>
> On Mon, Jul 11, 2016 at 4:42 PM, Cameron McKenzie <mckenzie.cam@gmail.com>
> wrote:
>
>> It looks like a connection issue based on the logs. When you confirmed
>> that the connection was ok via the zkCli, was that running on the same host
>> as the read only server? Can you run it from the same host that you're
>> running the Java client from?
>>
>> On Tue, Jul 12, 2016 at 9:40 AM, Benjamin Jaton <benjamin.jaton@gmail.com
>> > wrote:
>>
>>> Well I was trying to let it run and it eventually fails, with a stack:
>>>
>>> Successfully established the connection with ZooKeeper
>>> 2016-07-11 16:28:21,943 INFO  org.apache.zookeeper.ClientCnxn:1251 -
>>> Client session timed out, have not heard from server in 22519ms for
>>> sessionid 0x0, closing socket connection and attempting reconnect
>>> 2016-07-11 16:28:22,046 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 16:28:22,050 INFO  org.apache.zookeeper.ClientCnxn:980 -
>>> Socket connection established, initiating session, client: /
>>> 10.11.12.4:54702, server: QA-E8WIN11/10.11.8.236:2181
>>> 2016-07-11 16:28:22,058 INFO  org.apache.zookeeper.ClientCnxn:1400 -
>>> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
>>> sessionid = 0x100024f09360080, negotiated timeout = 45000 (READ-ONLY mode)
>>> 2016-07-11 16:28:22,061 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 200
>>> 2016-07-11 16:28:22,066 INFO
>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>> change: READ_ONLY
>>> 2016-07-11 16:30:29,312 INFO  org.apache.zookeeper.ClientCnxn:1253 -
>>> Unable to read additional data from server sessionid 0x100024f09360080,
>>> likely server has closed socket, closing socket connection and attempting
>>> reconnect
>>> 2016-07-11 16:30:29,416 INFO
>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>> change: SUSPENDED
>>> 2016-07-11 16:30:31,031 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 16:30:31,032 INFO  org.apache.zookeeper.ClientCnxn:980 -
>>> Socket connection established, initiating session, client: /
>>> 10.11.12.4:55156, server: QA-E8WIN11/10.11.8.236:2181
>>> 2016-07-11 16:30:31,034 INFO  org.apache.zookeeper.ClientCnxn:1400 -
>>> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
>>> sessionid = 0x100024f09360083, negotiated timeout = 45000 (READ-ONLY mode)
>>> 2016-07-11 16:30:31,034 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 400
>>> 2016-07-11 16:30:31,035 INFO
>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>> change: READ_ONLY
>>> 2016-07-11 16:32:38,335 INFO  org.apache.zookeeper.ClientCnxn:1253 -
>>> Unable to read additional data from server sessionid 0x100024f09360083,
>>> likely server has closed socket, closing socket connection and attempting
>>> reconnect
>>> 2016-07-11 16:32:38,441 INFO
>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>> change: SUSPENDED
>>> 2016-07-11 16:32:40,425 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 16:32:40,426 INFO  org.apache.zookeeper.ClientCnxn:980 -
>>> Socket connection established, initiating session, client: /
>>> 10.11.12.4:55637, server: QA-E8WIN11/10.11.8.236:2181
>>> 2016-07-11 16:32:40,428 INFO  org.apache.zookeeper.ClientCnxn:1400 -
>>> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
>>> sessionid = 0x100024f09360087, negotiated timeout = 45000 (READ-ONLY mode)
>>> 2016-07-11 16:32:40,428 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 800
>>> 2016-07-11 16:32:40,428 INFO
>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>> change: READ_ONLY
>>> 2016-07-11 16:34:47,615 INFO  org.apache.zookeeper.ClientCnxn:1253 -
>>> Unable to read additional data from server sessionid 0x100024f09360087,
>>> likely server has closed socket, closing socket connection and attempting
>>> reconnect
>>> 2016-07-11 16:34:47,716 INFO
>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>> change: SUSPENDED
>>> 2016-07-11 16:34:49,557 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 16:34:49,558 INFO  org.apache.zookeeper.ClientCnxn:980 -
>>> Socket connection established, initiating session, client: /
>>> 10.11.12.4:56094, server: QA-E8WIN11/10.11.8.236:2181
>>> 2016-07-11 16:34:49,560 INFO  org.apache.zookeeper.ClientCnxn:1400 -
>>> Session establishment complete on server QA-E8WIN11/10.11.8.236:2181,
>>> sessionid = 0x100024f09360089, negotiated timeout = 45000 (READ-ONLY mode)
>>> 2016-07-11 16:34:49,560 INFO  org.apache.zookeeper.ClientCnxn:1297 -
>>> Checking server QA-E8WIN12/10.11.8.232:2181 for being r/w. Timeout 1600
>>> 2016-07-11 16:34:49,560 INFO
>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>> change: READ_ONLY
>>> 2016-07-11 16:36:56,895 INFO  org.apache.zookeeper.ClientCnxn:1253 -
>>> Unable to read additional data from server sessionid 0x100024f09360089,
>>> likely server has closed socket, closing socket connection and attempting
>>> reconnect
>>> Exception in thread "main" 2016-07-11 16:36:56,996 INFO
>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>> change: SUSPENDED
>>> 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.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:310)
>>>     at
>>> org.apache.curator.framework.imps.GetDataBuilderImpl$4.call(GetDataBuilderImpl.java:299)
>>>     at org.apache.curator.RetryLoop.callWithRetry(RetryLoop.java:108)
>>>     at
>>> org.apache.curator.framework.imps.GetDataBuilderImpl.pathInForeground(GetDataBuilderImpl.java:295)
>>>     at
>>> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:287)
>>>     at
>>> org.apache.curator.framework.imps.GetDataBuilderImpl.forPath(GetDataBuilderImpl.java:34)
>>>     at TestCuratorReadOnly.main(TestCuratorReadOnly.java:23)
>>>
>>> On Mon, Jul 11, 2016 at 4:39 PM, Cameron McKenzie <
>>> mckenzie.cam@gmail.com> wrote:
>>>
>>>> So, it appears that the initial connection occurs ok, but then
>>>> something goes wrong
>>>>
>>>> 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
>>>>
>>>> Then a reconnection occurs ok, and then the cycle starts again.
>>>>
>>>> Can you see where in the stack the getData() call is hanging?
>>>>
>>>> On Tue, Jul 12, 2016 at 9:35 AM, Benjamin Jaton <
>>>> benjamin.jaton@gmail.com> wrote:
>>>>
>>>>> The blockUntilConnectedOrTimedOut() does return, we see the line:
>>>>> "Successfully established the connection with ZooKeeper"
>>>>> which happens right after.
>>>>>
>>>>> The getData() is where it hangs.
>>>>>
>>>>> We see this first:
>>>>> 2016-07-11 15:47:08,420 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: READ_ONLY
>>>>>
>>>>> and then we see it again 2 minutes later:
>>>>> 2016-07-11 15:49:17,316 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: READ_ONLY
>>>>>
>>>>> and then again 2 minutes after that:
>>>>> 2016-07-11 15:51:26,470 INFO
>>>>> org.apache.curator.framework.state.ConnectionStateManager:228 - State
>>>>> change: READ_ONLY
>>>>>
>>>>> Then I stopped it.
>>>>>
>>>>> On Mon, Jul 11, 2016 at 4:13 PM, Cameron McKenzie <
>>>>> mckenzie.cam@gmail.com> wrote:
>>>>>
>>>>>> hey Ben,
>>>>>> From the logs it looks like the connection is established at the
end?
>>>>>>
>>>>>> Are you saying that the blockUntilConnectedOrTimedOut() does not
>>>>>> return when this occurs?
>>>>>> cheers
>>>>>>
>>>>>>
>>>>>> On Tue, Jul 12, 2016 at 9:10 AM, Benjamin Jaton <
>>>>>> bjaton@radiantlogic.com> wrote:
>>>>>>
>>>>>>> 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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