Wednesday, August 14, 2013

Don't call filesystem.close in Hadoop

Recently the MapReduce jobs in my project suddenly failed. It turned out that my colleague added a line in the code which closes the filesystem.

val path = new Path("/user/bewang/data")
val fs = path.getFileSystem(conf)
Nothing seems wrong. We were told to clean up the mess you created. After using it, just close it. Is it a good practice? Unfortunately it doesn't work in Hadoop world. Actually Hadoop client manage all connections to Hadoop cluster. If you call fs.close(), the connections to the cluster are broken, and you cannot do anything after that. Don't call close, let Hadoop handle it.


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