Harsh J created HDFS-3886:
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Summary: Shutdown requests can possibly check for checkpoint
issues (corrupted edits) and save a good namespace copy before closing down?
Key: HDFS-3886
URL: https://issues.apache.org/jira/browse/HDFS-3886
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 2.0.0-alpha
Reporter: Harsh J
Priority: Minor
HDFS-3878 sorta gives me this idea. Aside of having a method to download it to
a different location, we can also lock up the namesystem (or deactivate the
client rpc server) and save the namesystem before we complete up the shutdown.
The init.d/shutdown scripts would have to work with this somehow though, to not
kill -9 it when in-process. Also, the new image may be stored in a
shutdown.chkpt directory, to not interfere in the regular dirs, but still allow
easier recovery.
Obviously this will still not work if all directories are broken. So maybe we
could have some configs to tackle that as well?
I haven't thought this through, so let me know what part is wrong to do :)
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