Hbase Merge Multiple region

Let's say your table has 10 region and their names are 1,2...10.

Hbase does not provide a direct merge 2-8 of these 7 region methods, if you want to merge multiple region, it is a little more trouble, the method is as follows

First, use the Merge_region method that comes with the hbase shell:

Merge the regions. Passing ' true ' as the optional third parameter would force
A merge (' force ' merges regardless else merge would fail unless passed
Adjacent regions. "Force" is a for-expert use only).


Note:you must pass the encoded region name, the
This command was a little different from and region operations. The encoded
Region name was the hash suffix on region names:e.g. If the region name were
testtable,0094429456,1289497600452.527db22f95c8a9e0116f0cc13c680396. Then
The encoded region name portion is 527db22f95c8a9e0116f0cc13c680396


Examples:


hbase> merge_region ' encoded_regionname ', ' encoded_regionname '
hbase> merge_region ' encoded_regionname ', ' encoded_regionname ', true

Merging multiple region with the Merge_region method will generate a new region, but there will be 2 issues

1:overlap (HBase metadata information not processed)

The region information on the 2:HDFS was not processed.

To resolve both issues, you can use the HBase hbck command, for example:

HBase hbck Ssp_rt-fixhdfsoverlaps-maxmerge 100-fixmeta-fixassignments

This command merges the region of overlap in hbase metadata and deletes the corresponding file on HDFs