[HBASE-7826] Improve Hbase Thrift v1 to return results in sorted order

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.94.0
• Fix Version/s: 0.98.0, 0.95.2, 0.94.11
• Component/s: Thrift
• Labels: Hbase Thrift
• Hadoop Flags: Reviewed

Release Note

When passing a TScan object, it's possible to ask for sortColumns. The result of doing this will populate TRowResult's "sortedColumns" instead of "columns", where the former is a list of the new type TColumn that wraps a column name and a TCell.
Backward compatibility is kept. Old clients will work against thrift servers with this patch, but new clients cannot request sorted columns on an old thrift server.

• Assignee: Shivendra Pratap Singh
• Reporter: Shivendra Pratap Singh
• Created: 12/Feb/13 02:13
• Updated: 28/Aug/13 20:05
• Resolved: 29/Jul/13 23:34

Description

Hbase natively stores columns sorted based on the column qualifier. A scan is guaranteed to return sorted columns. The Java API works fine but the Thrift API is broken. Hbase uses TreeMap that ensures that sort order is maintained. However Hbase thrift specification uses a simple Map to store the data. A map, since it is unordered doesn't result in columns being returned in a sort order that is consistent with their storage in Hbase.

Issue Links

• relates to: HBASE-8823 Ensure HBASE-7826 is covered by Thrift 2