Kousuke Saruta created HADOOP-10113:
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Summary: There are some threads which will be dead silently when
uncaught exception/error occured
Key: HADOOP-10113
URL: https://issues.apache.org/jira/browse/HADOOP-10113
Project: Hadoop Common
Issue Type: Bug
Affects Versions: 3.0.0
Reporter: Kousuke Saruta
Fix For: 3.0.0
Related to HDFS-5500, I found there are some threads be dead silently when
uncaught exception/error occured.
For example, following threads are I mentioned.
* refreshUsed in DU
* reloader in ReloadingX509TrustManager
* t in UserGroupInformation#spawnAutoRenewalThreadForUserCreds
* errThread in Shell#runCommand
* sinkThread in MetricsSinkAdapter
* blockScannerThread in DataBlockScanner
* emptier in NameNode#startTrashEmptier (when we use TrashPolicyDefault)
There are some critical threads if we can't notice the dead (e.g DU). I think
we should handle those exception/error, and monitor the liveness or log that.
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