shankar [mailto:sshan...@qubole.com]
> Sent: Saturday, May 12, 2012 12:05 PM
> To: user@hive.apache.org
> Subject: Re: how to select without Mapreduce after index build？
>
> My understanding is that the scan of the index is used to remove splits that
> are known not to contain m
)
Subject: Re: how to select without Mapreduce after index build？
Indexing in Hive works through map/reduce. There are no active components in
Hive (such as the region servers in Hbase), so the way the index is basically
used is by running the map/reduce job on the table that holds the index
AM
> To: user@hive.apache.org
> Cc: Zhaojun (Terry)
> Subject: Re: how to select without Mapreduce after index build？
>
> Indexing in Hive works through map/reduce. There are no active components in
> Hive (such as the region servers in Hbase), so the way the index is basically
>
.
So why index exist? No Performance improvements .
Best regards
Ransom.
From: Ashish Thusoo [mailto:athu...@qubole.com]
Sent: Saturday, May 12, 2012 12:18 AM
To: user@hive.apache.org
Cc: Zhaojun (Terry)
Subject: Re: how to select without Mapreduce after index build？
Indexing in
Indexing in Hive works through map/reduce. There are no active components
in Hive (such as the region servers in Hbase), so the way the index is
basically used is by running the map/reduce job on the table that holds the
index data to get all the relevant offsets into the main table and then
using
I think if I create index for one table
When I excute “select c1,c2 from tab where index_col=1”, should not start
mapreduce
But it was start .
So how to use a index without mapreduce?
Compact index and bitmap index all was tested , all need mapreduce .
