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HBase >> mail # user >> Start key and End key in HBase

raviprasad.t@... 2013-02-04, 04:41
Anoop Sam John 2013-02-04, 04:42
raviprasad.t@... 2013-02-04, 04:56
Mohammad Tariq 2013-02-04, 04:44
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RE: Start key and End key in HBase
When you do a scan with out specifying any start/end keys, it is full table scan. The scan from client side will go through all the regions one after the other.
But when you know the rowkey range that you want to scan you can specify that using start/end keys. This time client will evaluate which all regions it need to contact for scaning the data  (Based on the start/end keys of regions as stored in META table) and only those regions will get contacted and scanned.

Also remember that the start key need not be a full rowkey which exactly map to a rowkey within a table.  This can be a prefix part of the actual rowkey also.

Sent: Monday, February 04, 2013 10:11 AM
Subject: Start key and End key in HBase

Hi all,
  Can  anyone let me know what is the use of  Start key and End key in HBase.
Raviprasad. T
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Mohammad Tariq 2013-02-04, 07:11