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From Eno Thereska <eno.there...@gmail.com>
Subject Re: Unit tests (in Java) take a *very* long time to 'clean up'?
Date Fri, 11 Nov 2016 16:24:29 GMT
Hi Ali,

You're right, shutting down the broker and ZK is expensive. We kept the number of integration
tests relatively small (and pushed some more tests as system tests, while doing as many as
possible as unit tests). It's not just the shutdown that's expensive, it's also the starting
up unfortunately. It's on our todo list to do something about this, but we haven't gotten
there yet. If someone from the community wants to have a look and help out, that'd be great
(with a JIRA and PR).

About the second problem with ZK logs, this is being worked on as part of removing the ZK
dependency from streams and should be merged shortly: https://github.com/apache/kafka/pull/1884
<https://github.com/apache/kafka/pull/1884>. The msg you see does not affect correctness,
it's just annoying and it will go away.


> On 11 Nov 2016, at 14:28, Ali Akhtar <ali.rac200@gmail.com> wrote:
> I have some unit tests in which I create an embedded single broker kafka
> cluster, using :
> EmbeddedSingleNodeKafkaCluster.java from
> https://github.com/confluentinc/examples/blob/master/kafka-streams/src/test/java/io/confluent/examples/streams/kafka/EmbeddedSingleNodeKafkaCluster.java
> That class also creates an embedded zookeeper cluster / instance.
> The problem is, while the tests run pretty fast and pass, they then stay
> stuck in the 'teardown / clean up' stage for a really long time, often upto
> 10-20
> seconds per test.
> As I have a lot of test classes, each class creating its own embedded kafka
> cluster, this time can really add up during compiles.
> Is it possible to get these test classes to not do any clean up / safety
> stuff, because the instances are just throwaway. Just have them kill -9 the
> kafka / zookeeper and exit?
> It doesn't make any sense that tests pass within seconds, but can't move on
> to the next test class because its cleaning up.
> I also have an embedded cassandra instance in these tests, but I don't
> think that one is the problem, as i see a lot of zookeeper logs such as
> these after the test runs:
> 133764 [main-SendThread(] WARN
> org.apache.zookeeper.ClientCnxn  - Session 0x15853c3497f0001 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:717)
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
> at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
> Could it be that zookeeper doesn't exit and keeps retrying to connect?

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