How to custom rowKey for composite index in Hbase

[dinhphu2k1-gif]

I want to custom rowKey for composite index when it's inserted to Hbase table by add salt to rowKey.
I find a post in StackOverFlow about this problem https://stackoverflow.com/questions/45237151/hbase-row-key-split-algorithm.
But they don't show where i have to modify code or config Hbase.

Can anyon help me?

[vtslab]

What do you mean with the "rowKey for composite index" and what improvement should a custom rowKey bring?

[dinhphu2k1-gif]

I don't know if the composite index is evenly distributed across regions, so I'd like to prefix the key (composite index includes key-value) according to the stackoverflow post to make sure it's evenly distributed. Because I see the amount of requests across regions is not uniform

[vtslab]

OK, it sounds like you mean graph partitioning, that is the placement of vertices with their adjacencies across partitions/regions. Although the composite index is also stored in HBase as a separate table, it seems unlikely that you see the effect of unevenly spread index lookups.

For implementing a custom placement strategy the ids.num-partitions and ids.placement config properties are relevant, as well as the IDPlacementStrategy interface to implement.

[dinhphu2k1-gif]

@vtslab so How do i fix it (amount of requests across regions is not balance)?