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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "FAQ" by BryanDuxbury
Date Mon, 14 Jul 2008 17:49:42 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The following page has been changed by BryanDuxbury:

   1. Select a subset of files that take up a good percentage of your disk space; copy them
to new locations in HDFS; remove the old copies of the files; rename the new copies to their
original names.
   2. A simpler way, with no interruption of service, is to turn up the replication of files,
wait for transfers to stabilize, and then turn the replication back down.
   3. Yet another way to re-balance blocks is to turn off the data-node, which is full, wait
until its blocks are replicated, and then bring it back again. The over-replicated blocks
will be randomly removed from different nodes, so you really get them rebalanced not just
removed from the current node.
+  4. Finally, you can use the bin/start-balancer.sh command to run a balancing process to
move blocks around the cluster automatically.

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