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From "Bryan Duxbury (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-521) Improve client scanner interface
Date Mon, 17 Mar 2008 19:02:24 GMT
Improve client scanner interface

                 Key: HBASE-521
                 URL: https://issues.apache.org/jira/browse/HBASE-521
             Project: Hadoop HBase
          Issue Type: Improvement
          Components: client
            Reporter: Bryan Duxbury
            Priority: Minor
             Fix For: 0.2.0

The current client scanner interface is pretty ugly. You need to instantiate an HStoreKey
and SortedMap<Text, byte[]> externally and then pass them into next. This is pretty
bad, because for starters, the client has to choose the implementation of the map when they
create it, so it's extra brain cycles to figure that out. HStoreKey doesn't show up anywhere
else in the entire client side API, but here it bubbles out of next as a way to get the row
and presumably the timestamp of the columns.

I propose that we supplant HScannerInterface with Scanner, an easier-to-use version for clients.
Its next method would look something like:

public RowResult next() throws IOException;

This packs the data up much more cleanly, including using Cells as values instead of raw byte[],
meaning you have much more granular timestamp information. You also don't need HStoreKey anymore.

By breaking Scanner away from HScannerInterface, we can leave the internal scanning code completely
alone (keep using HStoreKeys and such) but make the client cleaner.

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