Hello Gurus,
I am trying to migrate some of PLSQL code to hadoop + Apache Pheonix.
See below sample example. it has cursor declaration and then iterating over
cursor to update table.
*Cursor Declaration:*
cursor cur is
select id_num,
txt_num
from numbers_en join translations using(id_num)
left join lang using(id_lang);
*Iterate over curser to update table translations:*
for rec in cur loop
if mod(rec.id_num,2) = 0 then
update translations set txt_trans = upper(txt_trans)
where current of cur;
end loop;
Easiest way to achieve is below :
1. * Make JDBC call to collect ResultSet
2. * Iterate through ResultSet
3. * In each record in resultset, make JDBC for update.
Dis-advantages with approach:
- Client become bottleneck as complete resultset will come to client
first.
- cursor logic is not leveraging parallelism processing.
Help me to implement the same bottleneck removed through Apache Pheonix +
HBAse + Hbase Coprocessor.
( Have Coprocessor on Query/View/Table scan and update operation within
coprocessor logic)
Any guidance highly appreciated.
Regards
Sanjiv Singh
Mob : +1 571-599-5236
