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From "Thomas Friedrich (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-14210) SSLFactory truststore reloader threads leaking in HiveServer2
Date Mon, 11 Jul 2016 23:59:10 GMT
Thomas Friedrich created HIVE-14210:
---------------------------------------

             Summary: SSLFactory truststore reloader threads leaking in HiveServer2
                 Key: HIVE-14210
                 URL: https://issues.apache.org/jira/browse/HIVE-14210
             Project: Hive
          Issue Type: Bug
          Components: Hive, HiveServer2
    Affects Versions: 2.1.0, 2.0.0, 1.2.1
            Reporter: Thomas Friedrich


We found an issue in a customer environment where the HS2 crashed after a few days and the
Java core dump contained several thousands of truststore reloader threads:

"Truststore reloader thread" #126 daemon prio=5 os_prio=0 tid=0x00007f680d2e3000 nid=0x98fd
waiting on 
condition [0x00007f67e482c000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
        at java.lang.Thread.sleep(Native Method)
        at org.apache.hadoop.security.ssl.ReloadingX509TrustManager.run
(ReloadingX509TrustManager.java:225)
        at java.lang.Thread.run(Thread.java:745)

We found the issue to be caused by a bug in Hadoop where the TimelineClientImpl is not destroying
the SSLFactory if SSL is enabled in Hadoop and the timeline server is running. I opened YARN-5309
which has more details on the problem, and a patch was submitted a few days back.

In addition to the changes in Hadoop, there are a couple of Hive changes required:
- ExecDriver needs to call jobclient.close() to trigger the clean-up of the resources after
the submitted job is done/failed
- Hive needs to pick up a newer release of Hadoop to pick up MAPREDUCE-6618 and MAPREDUCE-6621
that fixed issues with calling jobclient.close(). Both fixes are included in Hadoop 2.6.4.

However, since we also need to pick up YARN-5309, we need to wait for a new release of Hadoop.



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