Allow FileSystem shutdown hook to be disabled
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Key: HADOOP-4829
URL: https://issues.apache.org/jira/browse/HADOOP-4829
Project: Hadoop Core
Issue Type: New Feature
Components: fs
Affects Versions: 0.18.1
Reporter: Bryan Duxbury
Priority: Minor
FileSystem sets a JVM shutdown hook so that it can clean up the FileSystem
cache. This is great behavior when you are writing a client application, but
when you're writing a server application, like the Collector or an HBase
RegionServer, you need to control the shutdown of the application and HDFS much
more closely. If you set your own shutdown hook, there's no guarantee that your
hook will run before the HDFS one, preventing you from taking some shutdown
actions.
The current workaround I've used is to snag the FileSystem shutdown hook via
Java reflection, disable it, and then run it on my own schedule. I'd really
appreciate not having to do take this hacky approach. It seems like the right
way to go about this is to just to add a method to disable the hook directly on
FileSystem. That way, server applications can elect to disable the automatic
cleanup and just call FileSystem.closeAll themselves when the time is right.
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