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From "Thomas Scott (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11721) When Standby NameNode is paused using kill -SIGSTOP clients hang rather than moving to the active.
Date Fri, 28 Apr 2017 22:13:04 GMT
Thomas Scott created HDFS-11721:
-----------------------------------

             Summary: When Standby NameNode is paused using kill -SIGSTOP clients hang rather
than moving to the active.
                 Key: HDFS-11721
                 URL: https://issues.apache.org/jira/browse/HDFS-11721
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
            Reporter: Thomas Scott
            Priority: Minor


Using kill -SIGSTOP on the standby namenode causes clients to hang rather than moving to the
active. To reproduce:

1. Run kill -SIGSTOP <SBNN pid>
2. Run hdfs dfs -ls / (this may not show the issue as it may try the active namenode first.
If this happens, failover the NameNodes and the issue will occur)
3. To force the issue run hdfs dfs -ls hdfs://<sbnn ip>:8020/ 

This causes the client to hang with no timeout until the SBNN is resumed.



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