Colin Patrick McCabe created HDFS-3651:
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Summary: optionally, the NameNode should invoke saveNamespace
after getting a SIGTERM
Key: HDFS-3651
URL: https://issues.apache.org/jira/browse/HDFS-3651
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 2.0.0-alpha
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
Priority: Minor
It would be nice if the NameNode could be configured so that it did a
saveNamespace and then shut down cleanly after receiving a SIGTERM signal. In
general, it is a good practice to call saveNamespace when doing an orderly
shutdown, to ensure that all of the information in the namespace is on disk.
Of course, this should not be necessary if the SecondaryNameNode or
StandbyNameNode is operating correctly. However, when there are bugs in these
daemons, a saveNamespace can prevent disaster.
Currently, we don't catch SIGTERM, but just shut down immediately, without
doing any cleanup. Of course, it will always be possible to shut down the
NameNode without doing a saveNamespace, simply by sending SIGKILL, which is
un-catchable.
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