Note that getAllRows() is deprecated in Astyanax (see here <https://github.com/Netflix/astyanax/wiki/Getting-Started#iterate-through-the-entire-keyspace-deprecated> ).
You should prefer to use the AllRowsReader recipe: https://github.com/Netflix/astyanax/wiki/AllRowsReader-All-rows-query Note the section titled Reading only the row keys <https://github.com/Netflix/astyanax/wiki/AllRowsReader-All-rows-query#reading-only-the-row-keys>, which seems to match your use case exactly. You should start getting row keys back very, very quickly. On Fri, Jan 16, 2015 at 11:32 AM, Ruchir Jha <ruchir....@gmail.com> wrote: > We have a column family that has about 800K rows and on an average about a > million columns. I am interested in getting all the row keys in this column > family and I am using the following Astyanax code snippet to do this. > > This query never finishes (ran it for 2 days but did not finish). > > > This query however works with CF's that have lesser number of columns. > This leads me to believe that there might be an API that just retrieves the > row keys and does not depend on the number of columns in the CF. Any > suggestions are appreciated. > > > > I am running Cassandra 2.0.9 and this is a 4 node cluster. > > > > keyspace.prepareQuery(*this* > .wideRowTables.get(group)).setConsistencyLevel(ConsistencyLevel.CL_QUORUM).getAllRows().setRowLimit(1000) > > .setRepeatLastToken( > *false*).withColumnRange(*new* > RangeBuilder().setLimit(1).build()).executeWithCallback(*new* > RowCallback<String, T>() { > > > > @Override > > *public* > *boolean* failure(ConnectionException e) > > { > > > *return* *true*; > > } > > > > @Override > > *public* > *void* success(Rows<String, T> rows) > > { > > // > iterating over rows here > > } > > }); >
