Suppose, that you need to create an HBase table with a certain preliminary created number of regions. You can use RegionSplitter tool to do this.
Running RegionSplitter from command line / shell
An example of a call from the command line / shell:
$HBASE_HOME/bin/hbase org.apache.hadoop.hbase.util.RegionSplitter -c 10 -f cf your_namespace:your_table HexStringSplit
The pattern is:
RegionSplitter <OPTIONS> <TABLE> <SPLITALGORITHM>
SPLITALGORITHM is a java class name of a class implementing SplitAlgorithm, or one of the special strings HexStringSplit or UniformSplit, which are built-in split algorithms. HexStringSplit treats keys as hexadecimal ASCII, and UniformSplit treats keys as arbitrary bytes.
The main options are:
|-c <region count>||Create a new table with a pre-split number of regions|
|-D <property=value>||Override HBase Configuration Settings|
|-f <family:family:…>||Column Families to create with new table. Required with -c|
|-o <count>||Max outstanding splits that have unfinished major compaction|
|-r||Perform a rolling split of an existing region|
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