I think that you run several maintenance tasks after doing these changes.
* Start the balancer tool to redistribute the blocks by moving them from
over-utilized datanodes to under-utilized datanodes.
Rebember to change the dfs.balance.bandwidthPerSec property in the
hdfs-site.xml file.
* Run the fsck tool (everyday if it is possible) to check the health of
files in HDFS.
Regards
El 6/6/2011 3:29 PM, Jeff Bean escribió:
Sorry, that's rep factor and not blocksize. I think you need to copy the files.
Sent from my iPhone
On Jun 6, 2011, at 12:09 PM, "J. Ryan Earl"<o...@jryanearl.us> wrote:
Hello,
So I have a question about changing dfs.block.size in
$HADOOP_HOME/conf/hdfs-site.xml. I understand that when files are created,
blocksizes can be modified from default. What happens if you modify the
blocksize of an existing HDFS site? Do newly created files get the default
blocksize and old files remain the same? Is there a way to change the
blocksize of existing files; I'm assuming you could write MapReduce job to do
it, but any build in facilities?
Thanks,
-JR
--
Marcos Luís Ortíz Valmaseda
Software Engineer (UCI)
http://marcosluis2186.posterous.com
http://twitter.com/marcosluis2186
