[GitHub] [hive] dengzhhu653 commented on pull request #4449: HIVE-27463: Non-daemon thread prevents HMS from exiting when failed t…

["dengzhhu653 (via GitHub)" <gi...@apache.org>]

dengzhhu653 commented on PR #4449:
URL: https://github.com/apache/hive/pull/4449#issuecomment-1607369052

   > It wasn't a deamon before? I though it is / was
   
   It wasn't a daemon thread(started from the main thread), the stack trace can also imply that:
   ```
   "Thread-7" #38 prio=5 os_prio=0 tid=0x00007f813313c000 nid=0x12cc waiting on condition [0x00007f80f1581000]
      java.lang.Thread.State: TIMED_WAITING (sleeping)
   	at java.lang.Thread.sleep(Native Method)
   	at org.apache.hadoop.hive.metastore.HiveMetaStore$5.run(HiveMetaStore.java:11950)
   ```
   compared to a daemon thread, there is a **daemon** flag in the stack trace: 
   ```
   "Metastore threads starter thread" #37 daemon prio=5 os_prio=0 tid=0x00007f813313a800 nid=0x12cb waiting on condition [0x00007f80f2b1d000]
   ```
   


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