Zhiyong Liu created DRILL-510:
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Summary: zookeeper connections don't get released until all
queries are completed in a batch of tests
Key: DRILL-510
URL: https://issues.apache.org/jira/browse/DRILL-510
Project: Apache Drill
Issue Type: Bug
Reporter: Zhiyong Liu
In our drill automation system, a batch of over 200 tests were submitted via
the JDBC connection. The following investigating analyses were performed:
1. I put a sleep of 15 minutes in a single test case execution, and the
zookeeper connection was not closed until the test terminated after sleep time
ran out.
2. I then ran a couple of tests and reduced the sleep time to 5 minutes. Two
zookeeper connections were established (the second one after the second test
case was running) and were not closed until both tests terminated after sleep
time ran out.
3. I ran a batch of four tests and further reduced the sleep time to 2 minutes.
Four zookeeper connections were established (one after another till the last
test case started to run) and again, none of them was closed until all tests
terminated after sleep time out. Then it took about 10-15 seconds for all
connections to close.
>From these experiments, it appears to me that zookeeper connections are
>eventually closed, but not before all tests executed in one batch are
>completed. This explains that, with the default maximum number of zookeeper
>connections allowed, over 200 queries submitted in a batch are destined to
>fail shortly into the execution when all zookeeper connections are used up.
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