Aaron T. Myers created HADOOP-14855:
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Summary: Hadoop scripts may errantly believe a daemon is still
running, preventing it from starting
Key: HADOOP-14855
URL: https://issues.apache.org/jira/browse/HADOOP-14855
Project: Hadoop Common
Issue Type: Bug
Components: scripts
Affects Versions: 3.0.0-alpha4
Reporter: Aaron T. Myers
I encountered a case recently where the NN wouldn't start, with the error
message "namenode is running as process 16769. Stop it first." In fact the NN
was not running at all, but rather another long-running process was running
with this pid.
It looks to me like our scripts just check to see if _any_ process is running
with the pid that the NN (or any Hadoop daemon) most recently ran with. This is
clearly not a fool-proof way of checking to see if a particular type of daemon
is now running, as some other process could start running with the same pid
since the daemon in question was previously shut down.
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