DFS Upgrade should process dfs.data.dirs in parallel
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Key: HADOOP-2186
URL: https://issues.apache.org/jira/browse/HADOOP-2186
Project: Hadoop
Issue Type: Improvement
Reporter: Stu Hood
I just upgraded from 0.14.2 to 0.15.0, and things went very smoothly, if a
little slowly.
The main reason the upgrade took so long was the block upgrades on the
datanodes. Each of our datanodes has 3 drives listed for the dfs.data.dir
parameter. From looking at the logs, it is fairly clear that the upgrade
procedure does not attempt to upgrade all listed dfs.data.dir's in parallel.
I think even if all of your dfs.data.dir's are on the same physical device,
there would still be an advantage to performing the upgrade process in
parallel. The less downtime, the better: especially if it is potentially 20
minutes versus 60 minutes.
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