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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/MigrationToNewCluster" by NatHarward
Date Mon, 21 Jun 2010 02:28:32 GMT
Dear Wiki user,

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The "Hbase/MigrationToNewCluster" page has been changed by NatHarward.
The comment on this change is: Fixing numbering.
http://wiki.apache.org/hadoop/Hbase/MigrationToNewCluster?action=diff&rev1=2&rev2=3

--------------------------------------------------

  
  The steps:
  
-  # Get existing Hbase into a stable state
+  I. Get existing Hbase into a stable state
-   # Disable access to the existing Hbase, so that no data is changing (optionally disabling
your tables just to be sure)
+   i. Disable access to the existing Hbase, so that no data is changing (optionally disabling
your tables just to be sure)
-   # Major compact all tables
+   i. Major compact all tables
-   # Flush all tables
+   i. Flush all tables
-   # Shut down Hbase
+   i. Shut down Hbase
-  # Get existing HDFS into a stable state
+  I. Get existing HDFS into a stable state
-   # Disable any other HDFS access besides Hbase which should now be shut down
+   i. Disable any other HDFS access besides Hbase which should now be shut down
-   # Enter HDFS safe-mode
+   i. Enter HDFS safe-mode
-   # Run ''fsck'' and verify that everything is ok
+   i. Run ''fsck'' and verify that everything is ok
-  # Push Hbase data from the old cluster to the new one
+  I. Push Hbase data from the old cluster to the new one
-   # Use the ''distcp'' command to copy your Hbase root directory to the new cluster (this
command uses Map/Reduce, so it should be available where you run this command)
+   i. Use the ''distcp'' command to copy your Hbase root directory to the new cluster (this
command uses Map/Reduce, so it should be available where you run this command)
-   # ''Note: when I tried copying the root of the entire HDFS tree I got a NPE, but pushing
a top-level directory worked fine''
+   i. ''Note: when I tried copying the root of the entire HDFS tree I got a NPE, but pushing
a top-level directory worked fine''
-  # Verify data in the new HDFS cluster
+  I. Verify data in the new HDFS cluster
-   # I did a spot-check of file sizes and directories to my satisfaction -- depending on
how important your data is you may want some kind of checksumming crawler for verification
+   i. I did a spot-check of file sizes and directories to my satisfaction -- depending on
how important your data is you may want some kind of checksumming crawler for verification
-   # Run ''fsck'' to make sure HDFS is happy and does not think anything is wrong
+   i. Run ''fsck'' to make sure HDFS is happy and does not think anything is wrong
-  # Fire up Hbase in the new cluster
+  I. Fire up Hbase in the new cluster
-   # Make sure your configuration points to the ''new'' Hbase root directory in the new cluster
+   i. Make sure your configuration points to the ''new'' Hbase root directory in the new
cluster
-  # Verify Hbase connectivity, and again to your satisfaction verify the data accessible
through your new Hbase instance
+  I. Verify Hbase connectivity, and again to your satisfaction verify the data accessible
through your new Hbase instance
-  # Finito!
+  I. Finito!
  
  I specifically did not attempt to migrate any Zookeeper data, and found that I did not need
to -- I did not encounter any problems in skipping this but your mileage may vary.
  

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