I don't see a getKey on Result. Use
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/Result.html#getRow().
Here is how its used in the shell table.rb class:
# Count rows in a table
def count(interval = 1000, caching_rows = 10)
# We can safely set scanner caching with the first key only filter
scan = org.apache.hadoop.hbase.client.Scan.new
scan.cache_blocks = false
scan.caching = caching_rows
scan.setFilter(org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter.new)
# Run the scanner
scanner = @table.getScanner(scan)
count = 0
iter = scanner.iterator
# Iterate results
while iter.hasNext
row = iter.next
count += 1
next unless (block_given? && count % interval == 0)
# Allow command modules to visualize counting process
yield(count, String.from_java_bytes(row.getRow))
end
# Return the counter
return count
end
St.Ack
On Thu, Feb 3, 2011 at 6:47 AM, Something Something
<mailinglist...@gmail.com> wrote:
> Thanks. So I will add this...
>
> scan.setFilter(new FirstKeyOnlyFilter());
>
> But after I do this...
>
> Result result = scanner.next();
>
> There's no... result.getKey() - so what method would give me the Key value?
>
>
>
> On Wed, Feb 2, 2011 at 10:20 PM, Stack <st...@duboce.net> wrote:
>
>> See
>> http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/filter/FirstKeyOnlyFilter.html
>> St.Ack
>>
>> On Thu, Feb 3, 2011 at 6:01 AM, Something Something
>> <mailinglist...@gmail.com> wrote:
>> > I want to read only the keys in a table. I tried this...
>> >
>> > try {
>> >
>> > HTable table = new HTable("myTable");
>> >
>> > Scan scan = new Scan();
>> >
>> > scan.addFamily(Bytes.toBytes("Info"));
>> >
>> > ResultScanner scanner = table.getScanner(scan);
>> >
>> > Result result = scanner.next();
>> >
>> > while (result != null) {
>> >
>> > & so on...
>> >
>> > This was performing fairly well until I added another Family that
>> contains
>> > lots of key/value pairs. My understanding was that adding another family
>> > wouldn't affect performance of this code because I am explicitly using
>> > "Info", but it is.
>> >
>> > Anyway, in this particular use case, I only care about the "Key" of the
>> row.
>> > I don't need any values from any of the families. What's the best way
>> to
>> > do this?
>> >
>> > Please let me know. Thanks.
>> >
>>
>
