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From "Parise, Jonathan" <Jonathan.Par...@gd-ms.com>
Subject MiniAccumuloClutser Unit Test Problems
Date Fri, 26 Jun 2015 13:33:17 GMT
Hello,

I have been writing some J-unit tests based on the MiniAccumuloCluster class. I'm experiencing
some issues when several of the tests run back to back. Before I get into the error, let me
explain how the tests work in general. Also, I am using Accumulo 1.6.2.

Each test has an @BeforeClass method that first creates a new random directory. Then makes
a new MiniAccumuloCluster instance using that directory as the dir parameter. Then, I call
MiniAccumuloCluster.start().

There are several @Test methods in each test class. The typical pattern for them is that they
create any necessary tables, write some data into those tables and then scan to verify it
was written correctly. Basically they are testing that I can serialize and deserialize various
types of Objects correctly.

Then the test class as an @AfterClass method that calls MiniAccumuloCluster.stop(). It also
deletes the random directory used by the previous test.

The issue I am running into is that generally the first  test or two run fine. However, the
third test usually  gets stuck in the MiniAccumuloCluster startup. It just keeps complaining
about being unable to connect. Note that if the test is run independently it passes just fine.
When run back to back,  I see errors like this one repeatedly:

2015-06-26 09:10:24,352 INFO  [main-SendThread(localhost:47046)] zookeeper.ClientCnxn (ClientCnxn.java:startConnect(1058))
- Opening socket connection to server localhost/127.0.0.1:47046
2015-06-26 09:10:24,353 WARN  [main-SendThread(localhost:47046)] zookeeper.ClientCnxn (ClientCnxn.java:run(1185))
- Session 0x14e2ffc86d80004 for server null, unexpected error, closing socket connection and
attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1143)
2015-06-26 09:10:24,956 INFO  [main-SendThread(localhost:10406)] zookeeper.ClientCnxn (ClientCnxn.java:startConnect(1058))
- Opening socket connection to server localhost/127.0.0.1:10406
2015-06-26 09:10:24,957 WARN  [main-SendThread(localhost:10406)] zookeeper.ClientCnxn (ClientCnxn.java:run(1185))
- Session 0x14e2ffcb2390004 for server null, unexpected error, closing socket connection and
attempting reconnect
2015-06-26 09:10:51,764 INFO  [main-SendThread(localhost:10406)] zookeeper.ClientCnxn (ClientCnxn.java:startConnect(1058))
- Opening socket connection to server localhost/127.0.0.1:10406
2015-06-26 09:10:51,765 WARN  [main-SendThread(localhost:10406)] zookeeper.ClientCnxn (ClientCnxn.java:run(1185))
- Session 0x14e2ffcb2390004 for server null, unexpected error, closing socket connection and
attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1143)
2015-06-26 09:10:52,572 INFO  [main-SendThread(localhost:47046)] zookeeper.ClientCnxn (ClientCnxn.java:startConnect(1058))
- Opening socket connection to server localhost/127.0.0.1:47046
2015-06-26 09:10:52,573 WARN  [main-SendThread(localhost:47046)] zookeeper.ClientCnxn (ClientCnxn.java:run(1185))
- Session 0x14e2ffc86d80004 for server null, unexpected error, closing socket connection and
attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1143)
2015-06-26 09:10:52,890 INFO  [main-SendThread(localhost:10406)] zookeeper.ClientCnxn (ClientCnxn.java:startConnect(1058))
- Opening socket connection to server localhost/127.0.0.1:10406
2015-06-26 09:10:52,891 WARN  [main-SendThread(localhost:10406)] zookeeper.ClientCnxn (ClientCnxn.java:run(1185))
- Session 0x14e2ffcb2390004 for server null, unexpected error, closing socket connection and
attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1143)
2015-06-26 09:10:54,191 INFO  [main-SendThread(localhost:10406)] zookeeper.ClientCnxn (ClientCnxn.java:startConnect(1058))
- Opening socket connection to server localhost/127.0.0.1:10406
2015-06-26 09:10:54,192 WARN  [main-SendThread(localhost:10406)] zookeeper.ClientCnxn (ClientCnxn.java:run(1185))
- Session 0x14e2ffcb2390004 for server null, unexpected error, closing socket connection and
attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1143)
2015-06-26 09:10:54,471 INFO  [main-SendThread(localhost:47046)] zookeeper.ClientCnxn (ClientCnxn.java:startConnect(1058))
- Opening socket connection to server localhost/127.0.0.1:47046
2015-06-26 09:10:54,471 WARN  [main-SendThread(localhost:47046)] zookeeper.ClientCnxn (ClientCnxn.java:run(1185))
- Session 0x14e2ffc86d80004 for server null, unexpected error, closing socket connection and
attempting reconnect


In the ZooKeeperServerMain.out I see lines like this repeating several thousand times:

2015-06-26 08:39:44,810 INFO  [SyncThread:0] server.NIOServerCnxn (NIOServerCnxn.java:finishSessionInit(1580))
- Established session 0x14e2fe179eb0000 with negotiated timeout 30000 for client /127.0.0.1:36311
2015-06-26 08:39:45,278 INFO  [ProcessThread:-1] server.PrepRequestProcessor (PrepRequestProcessor.java:pRequest(419))
- Got user-level KeeperException when processing sessionid:0x14e2fe179eb0000 type:create cxid:0x31
zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error Path:/accumulo/87e85c1f-eb40-4695-b11d-67ed88586648/tables/+r/conf
Error:KeeperErrorCode = NodeExists for /accumulo/87e85c1f-eb40-4695-b11d-67ed88586648/tables/+r/conf
2015-06-26 08:39:45,300 INFO  [ProcessThread:-1] server.PrepRequestProcessor (PrepRequestProcessor.java:pRequest(419))
- Got user-level KeeperException when processing sessionid:0x14e2fe179eb0000 type:create cxid:0x33
zxid:0xfffffffffffffffe txntype:unknown reqpath:n/a Error Path:/accumulo/87e85c1f-eb40-4695-b11d-67ed88586648/tables/!0/conf
Error:KeeperErrorCode = NodeExists for /accumulo/87e85c1f-eb40-4695-b11d-67ed88586648/tables/!0/conf


I've thought about putting a Thread.sleep() call after the MiniAccumuloCluster.stop() call,
but that certainly seems brittle. I'm not sure if that would improve the situation.

It seems to me that the MiniAccumuloCluster does not behave well when instances are started
and stopped several times. I am running the tests through Maven using the default test behavior.

Could it be something with Maven? Maybe I need to be more explicit when telling it how to
run the tests?

Anyone have any insight into what is going wrong here? In general is my usage pattern correct
for MiniAccumuloCluster?


Thanks,

Jon Parise
Senior Software Engineer
Viz | General Dynamics Missons Systems

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