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From Chengwei Yang <chengwei.yang...@gmail.com>
Subject Need help to understand hadoop.tmp.dir
Date Mon, 03 Mar 2014 05:37:11 GMT
Hi List,

I'm confusing by hadoop.tmp.dir currently because its default value
"/tmp/hadoop-${user.name}" always means a directory in tmpfs in Linux.
So after the name node machine reboot, it gone away and then name node
fail to start.

I found this was reported here.
http://mail-archives.apache.org/mod_mbox/hadoop-hdfs-user/201205.mbox/%3CBAY148-W22BF95C5FBE2C40BF7CD9F86020@phx.gbl%3E

As I found from http://hadoop.apache.org/docs/r2.3.0/, there are a lot
properties are based on hadoop.tmp.dir, like
dfs.namenode.name.dir	file://${hadoop.tmp.dir}/dfs/name

I'm wondering, if we can set the default value of hadoop.tmp.dir to
a non-tmpfs direcotry if it doesn't work at all by using a real tmpfs
directory?

--
Thanks,
Chengwei

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