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From Cameron McKenzie <mckenzie....@gmail.com>
Subject Re: Curator never goes through when ZK is read-only
Date Tue, 12 Jul 2016 22:09:25 GMT
I'm at a bit of a loss then. Looking at the stack trace, it's in the ZK
code (not the Curator code) that it appears to be blocking. Maybe try and
create a test that removes Curator and just uses the ZK client directly and
see if you still have the same problem?

On Wed, Jul 13, 2016 at 7:54 AM, Benjamin Jaton <benjamin.jaton@gmail.com>
wrote:

> Yes, I mean the ping goes through properly
>
> On Tue, Jul 12, 2016 at 2:50 PM, Cameron McKenzie <mckenzie.cam@gmail.com>
> wrote:
>
>> Are the 'dead' hosts reachable? I seem to recall having problems with the
>> ZK client blocking for a long time if you had a host configured that was
>> resolvable but not reachable.
>>
>> On Wed, Jul 13, 2016 at 4:30 AM, Benjamin Jaton <benjamin.jaton@gmail.com
>> > wrote:
>>
>>> 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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