phoenix map existing HBase table

Question

I have a Hbase table "http_access_log", now i want to use Apache phoenix for SQL on it.

Should I create phoenix view or table to map hbase table? And if the hbase table is updated by the hbase api, will the phoenix view or table be updated?

Answer 1

If you have a pre-existing table you'll have to create a view to access it:

create view "http_access_log_v" (pk VARCHAR PRIMARY KEY, "colfam1"."colum1" VARCHAR, "colfam1"."colum2" VARCHAR) as select * from "http_access_log";

With the above view in place you can then do selects against it like so:

select * from http_access_log_v;

Example

Say I had a HBase table 'config'. I cannot do selects directly against this table via Phoenix.

sqlline> select * from "config"; 
Error: ERROR 1012 (42M03): Table undefined. tableName=config (state=42M03,code=1012)

However if I create a view against a select * from "config" of this HBase table:

sqlline> create view "config-data" (pk VARCHAR PRIMARY KEY, "data"."id" VARCHAR, "data"."categoryName" VARCHAR) as select * from "config";
No rows affected (1.588 seconds)

I can then query against a subset of the columns available that have been configured within a Phoenix SQL view:

sqlline> select * from "config-data";
+------------------------------------------+------------------------------------------+------------------------------------------+
|                    PK                    |                    id                    |               categoryName               |
+------------------------------------------+------------------------------------------+------------------------------------------+
| QA-AA00|D|MC|MSG|C10|M3               | null                                     | null                                     |
| QA-AA00|D|MC|MSG|C2|M1                | null                                     | null                                     |
...

And I still cannot query the HBase table directly:

sqlline> select * from "config"; Error: ERROR 1012 (42M03): Table undefined. tableName=config (state=42M03,code=1012)

References

• How I map Phoenix table to an existing HBase table?