[jira] [Created] (SOLR-14635) improve ThreadDumpHandler to show more info related to locks

["Chris M. Hostetter (Jira)" <ji...@apache.org>]

Chris M. Hostetter created SOLR-14635:
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             Summary: improve ThreadDumpHandler to show more info related to locks
                 Key: SOLR-14635
                 URL: https://issues.apache.org/jira/browse/SOLR-14635
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Chris M. Hostetter


Having recently spent some time trying to use ThreadDumpHandler to diagnose a "lock leak" i realized there are quite a few bits of info available from the ThreadMXBean/ThreadInfo datastcutures that are not included in the response, and i think we should add them:

* switch from {{findMonitorDeadlockedThreads()}} to {{findDeadlockedThreads()}} to also detect deadlocks from ownable syncrhonizers (ie: ReintrantLocks)
* for each thread:
** in addition to outputing the current {{getLockName()}} when a thread is blocked/waiting, return info about the lock owner when available.
*** there's already dead code checking this and then throwing away the info
** return the list of all locks (both monitors and ownable synchronizers) held by each thread



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