RowResult containing or supporting more flexible data structures to access
elements returned
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Key: HBASE-802
URL: https://issues.apache.org/jira/browse/HBASE-802
Project: Hadoop HBase
Issue Type: New Feature
Components: io
Affects Versions: 0.2.0
Reporter: Jonathan Gray
Fix For: 0.3.0
Extracting actual data from a RowResult can be an ugly process when you don't
know what you're looking for (to be able to query the Map).
For example, if i want to get all columns in a family, or I pass a large number
of columns each of which may or may not exist in the specified row, I need to
go through the entire list of column/Cells. Currently this is done with
something like:
RowResult result = HTable.getRow(rowkey,columns)
Set<Map.Entry<byte [], Cell>> cols = result.entrySet();
>From here I know how many entries are in the Set (cols.size()), but if I want
>to go through them, this requires another step change the Set into an Array or
>an Iterator.
Iterator<Map.Entry<byte [], Cell>> iterator = cols.iterator();
or
Map.Entry<byte [], Cell> [] entries = cols.toArray(new RowResult.Entry[0])
So going from what is returned from HBase, into something usable by the client,
requires at least two additional lines and data structure conversions. The Map
-> Set<Map.Entry> is very likely to be fast. I'm unsure about the speed of the
Iterator or toArray. I would guess that the change to Iterator is fairly
efficient (not requiring a copy of the memory), whereas toArray likely does.
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