Mark Robert Miller created HBASE-24155:
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Summary: When running the tests, a tremendous number of
connections are put into TIME_WAIT.
Key: HBASE-24155
URL: https://issues.apache.org/jira/browse/HBASE-24155
Project: HBase
Issue Type: Test
Components: test
Reporter: Mark Robert Miller
When you run the test suite and monitor the number of connections in TIME_WAIT,
it appears that a very large number of connections do not end up with a proper
connection close lifecycle.
Given connections can stay in TIME_WAIT from 1-4 minutes depending on OS/Env,
running the tests faster or with more tests in parallel increases the TIME_WAIT
connection buildup. Some tests spin up a very, very large number of connections
and if the wrong ones run at the same time, this can also greatly increase the
number of connections put into TIME_WAIT. This can have a dramatic affect on
performance (as it can take longer to create a new connection) or flat out fail
or timeout.
Ideally, a small proportion of connections in a test suite would end up in
TIME_WAIT in comparison to the number created.
Notes to come in comments below.
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