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https://issues.apache.org/jira/browse/HBASE-802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12621518#action_12621518
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Jonathan Gray commented on HBASE-802:
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Jim: yeah can definitely do something like that, but
stack: yes, HBASE-806 would suffice.
The combo of these two things would provide what I was looking for. Thanks.
> RowResult containing or supporting more flexible data structures to access
> elements returned
> --------------------------------------------------------------------------------------------
>
> 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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