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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Trivial Update of "Hbase/HowToMigrate" by stack
Date Mon, 21 Jul 2008 19:32:31 GMT
Dear Wiki user,

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The following page has been changed by stack:
http://wiki.apache.org/hadoop/Hbase/HowToMigrate

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  === Redo Logs ===
  
- It is possible that, when running the HBase migration command, the migration will fail because
of "unrecovered redo logs."  Redo logs are generated every time HBase is started, and under
normal circumstances they are removed when HBase is stopped.  However, if you have ever stopped
HBase in some atypical way (for example, using {{{kill -9}}}), these redo logs will persist
in Hadoop DFS.  To see if you have any unrecovered redo logs, stop any currently-running instances
of HBase and enter: {{{{$HADOOP_HOME}/bin/hadoop dfs -ls /hbase}}}.  All existing redo logs
will be in this directory.  Redo log directories can be removed using the dfs {{{-rmr}}} option.
 WARNING: redo logs are the only way to recover any data entered before HBase was improperly
stopped.  Removing redo logs with file size greater than zero may result in irreversible data
loss.
+ It is possible that, when running the HBase migration command, the migration will fail because
of "unrecovered redo logs."  Redo logs are generated every time HBase is started, and under
normal circumstances they are removed when HBase is stopped cleanly.  However, if you have
ever stopped HBase in some atypical way (for example, using {{{kill -9}}}), these redo logs
will persist in Hadoop DFS.  To see if you have any unrecovered redo logs, stop any currently-running
instances of HBase and enter: {{{{$HADOOP_HOME}/bin/hadoop dfs -ls /hbase}}}.  All existing
redo logs will be in this directory.  Redo log directories can be removed using dfs {{{-rm}}}
option.  WARNING: redo logs are the only way to recover any data entered before HBase was
improperly stopped.  Removing redo logs with file size greater than zero may result in irreversible
data loss.
  

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