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HBase, mail # user - Applying QualifierFilter to one column family only.

David Koch 2012-07-18, 22:06
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RE: Applying QualifierFilter to one column family only.
Anoop Sam John 2012-07-19, 05:05
Hi David,
              You want the below use case in scan
Table :T1
CF : T           CF: S
q1   q2..        q1  q2 ..............

Now in Scan u want to scan all the qualifiers under S and one qualifier under T. (I think I got ur use case correctly)

Well this use case u can achieve with out using any filter also.
Scan s = new Scan()
s.addFamily(S); // Tells to add all the qualifier(KVs) under this CF in the result
Use this scan object for your getScanner.
Using the addColumn you can add more than one qualifier under one CF too.

Hope this helps u.

From: David Koch [[EMAIL PROTECTED]]
Sent: Thursday, July 19, 2012 3:36 AM
Subject: Applying QualifierFilter to one column family only.


When scanning a table with 2 column families, is it possible to apply
a QualifierFilter selectively to one family but still include the other
family in the scan?

The layout of my table is as follows:

<rowkey>    T:<timestamp> --> <data>,    S:<summary_item> --> <value>

For each <rowkey> family T contains timestamp/data key/value pairs. Column
S contains summary information about this row key.

I want to apply a QualifierFilter to column T only - i.e filter by
<timestamp> but return also all of S whenever the set of key/values matched
in T is not empty. Is this doable using standard HBase filters? If so, how?
If not could I implement such a filter myself using FilterBase?

Thank you,

David Koch 2012-07-19, 08:27
Anoop Sam John 2012-07-20, 03:10
Anoop Sam John 2012-07-20, 03:12
Dhaval Shah 2012-07-20, 09:27