See https://builds.apache.org/job/ZooKeeper-trunk-openjdk7/1529/

###################################################################################
########################## LAST 60 LINES OF THE CONSOLE 
###########################
[...truncated 60.97 MB...]
    [junit] 2017-07-01 23:37:21,708 [myid:] - INFO  [main:ClientBase@571] - 
STOPPING server
    [junit] 2017-07-01 23:37:21,709 [myid:] - INFO  
[main:NettyServerCnxnFactory@464] - shutdown called 0.0.0.0/0.0.0.0:30319
    [junit] 2017-07-01 23:37:21,709 [myid:] - INFO  
[main-EventThread:ClientCnxn$EventThread@513] - EventThread shut down for 
session: 0x1052b7b0b360000
    [junit] 2017-07-01 23:37:21,711 [myid:] - INFO  [main:ZooKeeperServer@541] 
- shutting down
    [junit] 2017-07-01 23:37:21,711 [myid:] - ERROR [main:ZooKeeperServer@505] 
- ZKShutdownHandler is not registered, so ZooKeeper server won't take any 
action on ERROR or SHUTDOWN server state changes
    [junit] 2017-07-01 23:37:21,711 [myid:] - INFO  
[main:SessionTrackerImpl@232] - Shutting down
    [junit] 2017-07-01 23:37:21,711 [myid:] - INFO  
[main:PrepRequestProcessor@1008] - Shutting down
    [junit] 2017-07-01 23:37:21,711 [myid:] - INFO  
[main:SyncRequestProcessor@191] - Shutting down
    [junit] 2017-07-01 23:37:21,711 [myid:] - INFO  [ProcessThread(sid:0 
cport:30319)::PrepRequestProcessor@155] - PrepRequestProcessor exited loop!
    [junit] 2017-07-01 23:37:21,712 [myid:] - INFO  
[SyncThread:0:SyncRequestProcessor@169] - SyncRequestProcessor exited!
    [junit] 2017-07-01 23:37:21,712 [myid:] - INFO  
[main:FinalRequestProcessor@481] - shutdown of request processor complete
    [junit] 2017-07-01 23:37:21,712 [myid:] - INFO  [main:MBeanRegistry@128] - 
Unregister MBean 
[org.apache.ZooKeeperService:name0=StandaloneServer_port30319,name1=InMemoryDataTree]
    [junit] 2017-07-01 23:37:21,712 [myid:] - INFO  [main:MBeanRegistry@128] - 
Unregister MBean [org.apache.ZooKeeperService:name0=StandaloneServer_port30319]
    [junit] 2017-07-01 23:37:21,713 [myid:] - INFO  
[main:FourLetterWordMain@85] - connecting to 127.0.0.1 30319
    [junit] 2017-07-01 23:37:21,713 [myid:] - INFO  [main:JMXEnv@146] - 
ensureOnly:[]
    [junit] 2017-07-01 23:37:21,719 [myid:] - INFO  [main:ClientBase@626] - 
fdcount after test is: 7144 at start it was 7148
    [junit] 2017-07-01 23:37:21,720 [myid:] - INFO  [main:ZKTestCase$1@68] - 
SUCCEEDED testWatcherAutoResetWithLocal
    [junit] 2017-07-01 23:37:21,720 [myid:] - INFO  [main:ZKTestCase$1@63] - 
FINISHED testWatcherAutoResetWithLocal
    [junit] Tests run: 103, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 
428.75 sec, Thread: 8, Class: org.apache.zookeeper.test.NioNettySuiteTest
    [junit] 2017-07-01 23:37:21,875 [myid:127.0.0.1:30196] - INFO  
[main-SendThread(127.0.0.1:30196):ClientCnxn$SendThread@1113] - Opening socket 
connection to server 127.0.0.1/127.0.0.1:30196. Will not attempt to 
authenticate using SASL (unknown error)
    [junit] 2017-07-01 23:37:21,876 [myid:127.0.0.1:30196] - WARN  
[main-SendThread(127.0.0.1:30196):ClientCnxn$SendThread@1235] - Session 
0x1052b77bf2a0000 for server 127.0.0.1/127.0.0.1:30196, unexpected error, 
closing socket connection and attempting reconnect
    [junit] java.net.ConnectException: Connection refused
    [junit]     at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    [junit]     at 
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
    [junit]     at 
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:357)
    [junit]     at 
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1214)
    [junit] 2017-07-01 23:37:22,033 [myid:127.0.0.1:30137] - INFO  
[main-SendThread(127.0.0.1:30137):ClientCnxn$SendThread@1113] - Opening socket 
connection to server 127.0.0.1/127.0.0.1:30137. Will not attempt to 
authenticate using SASL (unknown error)
    [junit] 2017-07-01 23:37:22,034 [myid:127.0.0.1:30137] - WARN  
[main-SendThread(127.0.0.1:30137):ClientCnxn$SendThread@1235] - Session 
0x1052b753cd70000 for server 127.0.0.1/127.0.0.1:30137, unexpected error, 
closing socket connection and attempting reconnect
    [junit] java.net.ConnectException: Connection refused
    [junit]     at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    [junit]     at 
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
    [junit]     at 
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:357)
    [junit]     at 
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1214)
    [junit] 2017-07-01 23:37:22,054 [myid:127.0.0.1:30122] - INFO  
[main-SendThread(127.0.0.1:30122):ClientCnxn$SendThread@1113] - Opening socket 
connection to server 127.0.0.1/127.0.0.1:30122. Will not attempt to 
authenticate using SASL (unknown error)
    [junit] 2017-07-01 23:37:22,055 [myid:127.0.0.1:30122] - WARN  
[main-SendThread(127.0.0.1:30122):ClientCnxn$SendThread@1235] - Session 
0x1052b74e6b70001 for server 127.0.0.1/127.0.0.1:30122, unexpected error, 
closing socket connection and attempting reconnect
    [junit] java.net.ConnectException: Connection refused
    [junit]     at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    [junit]     at 
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
    [junit]     at 
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:357)
    [junit]     at 
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1214)
    [junit] 2017-07-01 23:37:22,094 [myid:127.0.0.1:30199] - INFO  
[main-SendThread(127.0.0.1:30199):ClientCnxn$SendThread@1113] - Opening socket 
connection to server 127.0.0.1/127.0.0.1:30199. Will not attempt to 
authenticate using SASL (unknown error)
    [junit] 2017-07-01 23:37:22,095 [myid:127.0.0.1:30199] - WARN  
[main-SendThread(127.0.0.1:30199):ClientCnxn$SendThread@1235] - Session 
0x2052b77bf280000 for server 127.0.0.1/127.0.0.1:30199, unexpected error, 
closing socket connection and attempting reconnect
    [junit] java.net.ConnectException: Connection refused
    [junit]     at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
    [junit]     at 
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
    [junit]     at 
org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:357)
    [junit]     at 
org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1214)

fail.build.on.test.failure:

BUILD FAILED
/home/jenkins/jenkins-slave/workspace/ZooKeeper-trunk-openjdk7/build.xml:1219: 
The following error occurred while executing this line:
/home/jenkins/jenkins-slave/workspace/ZooKeeper-trunk-openjdk7/build.xml:1223: 
Tests failed!

Total time: 10 minutes 17 seconds
Build step 'Invoke Ant' marked build as failure
Recording test results
Email was triggered for: Failure - Any
Sending email for trigger: Failure - Any



###################################################################################
############################## FAILED TESTS (if any) 
##############################
1 tests failed.
FAILED:  org.apache.zookeeper.test.QuorumHammerTest.testHammerBasic

Error Message:
unable to create new native thread

Stack Trace:
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:714)
        at 
org.apache.zookeeper.server.NIOServerCnxnFactory.start(NIOServerCnxnFactory.java:746)
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.startServerCnxnFactory(QuorumPeer.java:1601)
        at 
org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:772)
        at 
org.apache.zookeeper.test.QuorumBase.startServers(QuorumBase.java:216)
        at org.apache.zookeeper.test.QuorumBase.setUp(QuorumBase.java:120)
        at org.apache.zookeeper.test.QuorumBase.setUp(QuorumBase.java:78)
        at 
org.apache.zookeeper.test.QuorumHammerTest.setUp(QuorumHammerTest.java:36)

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