[jira] [Created] (HBASE-24155) When running the tests, a tremendous number of connections are put into TIME_WAIT.

["Mark Robert Miller (Jira)" <ji...@apache.org>]

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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