We ran into some similar errors in playorm development. Basically, you defined a composite probably but are not correctly using that composite. I am not sure about queries though as we had the issue when saving data (ie. Using deviceID+deviceName did not work and we had to create an full blown composite object). I think you need to read up on how astyanax works with compositesŠ..I am not sure this is a cassandra question reallyŠ.more of an astyanax one.
Dean On 4/1/13 11:48 PM, "Apurva Jalit" <apurva.ja...@gmail.com> wrote: >I have a scheme as follows: > > TimeStamp > Device ID > Device Name > Device Owner > Device location > >I have created this column family using CQL and defined the primary key >as >(TimeStamp,Device ID, Device Name). Through a serializable object that >has >fields for DeviceID, name and a field name (which stores either Device >Owner or >Device Location). I have inserted some records using Astyanax. > >As per my understanding, the columns for a row are created by combining >Device >ID, Device Name and field name as column name and the value to be the >value for >that particular field. Thus for a particular timestamp and device, the >column >names would be in the pattern (Device ID:Device Name: ...). > >So I believe we can use these 2 fields as prefix to obtain all the >entries for a >particular time-device combination. > >I am using the following query to obtain the results: > > RowSliceQuery<String, ApBaseData> query = adu.keyspace > .prepareQuery(columnFamily) > .getKeySlice(timeStamp) > .withColumnRange(new RangeBuilder() > .setStart(deviceID+deviceName+"_\u00000") > .setEnd(deviceID+deviceName+"_\uffff") > .setLimit(batch_size) > .build()); > >But on executing the above query I get the following Exception: > >BadRequestException: [host=localhost(127.0.0.1):9160, latency=6(6), >attempts=1]InvalidRequestException(why:Not enough bytes to read value of >component 0) > >Can any one help to understand where am I going wrong? > >
