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From Mark Johnson <mark.john...@servicemesh.com>
Subject Problem creating Ephemeral znodes
Date Tue, 19 Sep 2017 15:16:06 GMT
Hi,

I'm running version 3.5.3-BETA of Zookeeper in a Docker container and 
usually cannot create Ephemeral znodes, either through the CLI or though 
a Java program.  It appears the owner is not set.  Here's an example 
session:

============================================================================================================
[root@Appliance ~]# docker exec -it 9b7cd1e80b5b /bin/bash
zookeeper@9b7cd1e80b5b:/opt/zookeeper-3.5.3-beta$ bin/zkCli.sh
Connecting to localhost:2181
2017-09-19 10:03:31,373 [myid:] - INFO  [main:Environment@109] - Client 
environment:zookeeper.version=3.5.3-beta-8ce24f9e675cbefffb8f21a47e06b42864475a60, 
built on 04/03/2017 16:19 GMT
2017-09-19 10:03:31,378 [myid:] - INFO  [main:Environment@109] - Client 
environment:host.name=9b7cd1e80b5b
2017-09-19 10:03:31,378 [myid:] - INFO  [main:Environment@109] - Client 
environment:java.version=1.8.0_144
2017-09-19 10:03:31,380 [myid:] - INFO  [main:Environment@109] - Client 
environment:java.vendor=Oracle Corporation
2017-09-19 10:03:31,380 [myid:] - INFO  [main:Environment@109] - Client 
environment:java.home=/usr/lib/jvm/java-8-oracle/jre
2017-09-19 10:03:31,380 [myid:] - INFO  [main:Environment@109] - Client 
environment:java.class.path=/opt/zookeeper-3.5.3-beta/bin/../build/classes:/opt/zookeeper-3.5.3-beta/bin/../build/lib/*.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/slf4j-log4j12-1.7.5.jar
:/opt/zookeeper-3.5.3-beta/bin/../lib/slf4j-api-1.7.5.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/netty-3.10.5.Final.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/log4j-1.2.17.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/jline-2.11.jar:/opt/zookeeper-3.5.3-beta/bin/..
/lib/jetty-util-9.2.18.v20160721.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/jetty-servlet-9.2.18.v20160721.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/jetty-server-9.2.18.v20160721.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/jetty-security-9.2.18.v20160721.jar:/op
t/zookeeper-3.5.3-beta/bin/../lib/jetty-io-9.2.18.v20160721.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/jetty-http-9.2.18.v20160721.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/javax.servlet-api-3.1.0.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/jackson-mapper-asl-1.
9.11.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/jackson-core-asl-1.9.11.jar:/opt/zookeeper-3.5.3-beta/bin/../lib/commons-cli-1.2.jar:/opt/zookeeper-3.5.3-beta/bin/../zookeeper-3.5.3-beta.jar:/opt/zookeeper-3.5.3-beta/bin/../src/java/lib/*.jar:/opt/zookeeper-
3.5.3-beta/bin/../conf:
2017-09-19 10:03:31,380 [myid:] - INFO  [main:Environment@109] - Client 
environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2017-09-19 10:03:31,380 [myid:] - INFO  [main:Environment@109] - Client 
environment:java.io.tmpdir=/tmp
2017-09-19 10:03:31,380 [myid:] - INFO  [main:Environment@109] - Client 
environment:java.compiler=<NA>
2017-09-19 10:03:31,380 [myid:] - INFO  [main:Environment@109] - Client 
environment:os.name=Linux
2017-09-19 10:03:31,380 [myid:] - INFO  [main:Environment@109] - Client 
environment:os.arch=amd64
2017-09-19 10:03:31,381 [myid:] - INFO  [main:Environment@109] - Client 
environment:os.version=3.10.0-514.26.2.el7.x86_64
2017-09-19 10:03:31,381 [myid:] - INFO  [main:Environment@109] - Client 
environment:user.name=zookeeper
2017-09-19 10:03:31,381 [myid:] - INFO  [main:Environment@109] - Client 
environment:user.home=/home/zookeeper
2017-09-19 10:03:31,381 [myid:] - INFO  [main:Environment@109] - Client 
environment:user.dir=/opt/zookeeper-3.5.3-beta
2017-09-19 10:03:31,381 [myid:] - INFO  [main:Environment@109] - Client 
environment:os.memory.free=233MB
2017-09-19 10:03:31,382 [myid:] - INFO  [main:Environment@109] - Client 
environment:os.memory.max=240MB
2017-09-19 10:03:31,383 [myid:] - INFO  [main:Environment@109] - Client 
environment:os.memory.total=240MB
2017-09-19 10:03:31,386 [myid:] - INFO  [main:ZooKeeper@865] - 
Initiating client connection, connectString=localhost:2181 
sessionTimeout=30000 
watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@28ba21f3
2017-09-19 10:03:31,397 [myid:] - INFO  [main:ClientCnxnSocket@236] - 
jute.maxbuffer value is 4194304 Bytes
2017-09-19 10:03:31,410 [myid:localhost:2181] - INFO 
[main-SendThread(localhost:2181):ClientCnxn$SendThread@1113] - Opening 
socket connection to server localhost/127.0.0.1:2181. Will not attempt 
to authenticate using SASL (unknown error)
Welcome to ZooKeeper!
JLine support is enabled
2017-09-19 10:03:31,493 [myid:localhost:2181] - INFO 
[main-SendThread(localhost:2181):ClientCnxn$SendThread@948] - Socket 
connection established, initiating session, client: /127.0.0.1:44882, 
server: localhost/127.0.0.1:2181
2017-09-19 10:03:31,506 [myid:localhost:2181] - INFO 
[main-SendThread(localhost:2181):ClientCnxn$SendThread@1381] - Session 
establishment complete on server localhost/127.0.0.1:2181, sessionid = 
0xeb0000480b3c005c, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] create -e /testnode
Created /testnode
[zk: localhost:2181(CONNECTED) 1] stat /testnode
cZxid = 0x2000002c4
ctime = Tue Sep 19 10:03:50 CDT 2017
mZxid = 0x2000002c4
mtime = Tue Sep 19 10:03:50 CDT 2017
pZxid = 0x2000002c4
cversion = 0
dataVersion = 0
aclVersion = 0
*ephemeralOwner = 0x0*
dataLength = 0
numChildren = 0
[zk: localhost:2181(CONNECTED) 2]
==========================================================================================================

If I disconnect and reconnect, the znode is still present as well. If I 
restart Zookeeper, many times this will resolve itself somehow and 
creation of ephemeral nodes will work correctly.  I have also tried this 
in a clustered configuration and get cases where one Zookeeper will 
create ephemeral nodes correctly and another Zookeeper will exhibit the 
above issue.

Please let me know what other information would be of use or other 
things I could be looking for.

Any help appreciated.

Mark




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