question Re: HBase changing schema - adding a column / column familes in Support Questions

HBase changing schema - adding a column / column familes

CezK — Tue, 18 Feb 2020 20:01:50 GMT

Hi,

I have large HBase table and would like to add a new column family with 1 column.

I know about "alter" which adds the to schema to all regions.

But it really means adding schema to region ?

Is it only change schema or rewrite data ?

Regards,

Cezary

Re: HBase changing schema - adding a column / column familes

rakanchi — Thu, 27 Feb 2020 07:29:03 GMT

Hello Cezary,

hbase> alter helps to add/modify/delete column family.

But it's not possible to rename existing column family and it will not re-write any data.

It is advisable to disable table and perform >alter and enable the table.

Also, if you modify properties like TTL, versions it will applicable for new writes and for existing data it will take effect only after >major_compact <table>

Hope that helps!

Re: HBase changing schema - adding a column / column familes

CezK — Thu, 27 Feb 2020 16:05:38 GMT

Ok, thank ypu !