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
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|
If you still have any questions, feel free to ask me in the comments under this article, or write me on firstname.lastname@example.org.