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