You'd be better off using external indexing (ElasticSearch or Solr), Cassandra isn't really designed for this sort of querying. On Jun 24, 2014 3:09 AM, "Mike Carter" <jaloos...@gmail.com> wrote:
> Hello! > > > I'm a beginner in C* and I'm quite struggling with it. > > I’d like to measure the performance of some Cassandra-Range-Queries. The > idea is to execute multidimensional range-queries on Cassandra. E.g. there > is a given table of 1million rows with 10 columns and I like to execute > some queries like “select count(*) from testable where d=1 and v1<10 and v2 > >20 and v3 <45 and v4>70 … allow filtering”. This kind of queries is very > slow in C* and soon the tables are bigger, I get a read-timeout probably > caused by long scan operations. > > In further tests I like to extend the dimensions to more than 200 hundreds > and the rows to 100millions, but actually I can’t handle this small table. > Should reorganize the data or is it impossible to perform such high > multi-dimensional queries on Cassandra? > > > > > > The setup: > > Cassandra is installed on a single node with 2 TB disk space and 180GB Ram. > > Connected to Test Cluster at localhost:9160. > > [cqlsh 4.1.1 | Cassandra 2.0.7 | CQL spec 3.1.1 | Thrift protocol 19.39.0] > > > > Keyspace: > > CREATE KEYSPACE test WITH replication = { > > 'class': 'SimpleStrategy', > > 'replication_factor': '1' > > }; > > > > > > Table: > > CREATE TABLE testc21 ( > > key int, > > d int, > > v1 int, > > v10 int, > > v2 int, > > v3 int, > > v4 int, > > v5 int, > > v6 int, > > v7 int, > > v8 int, > > v9 int, > > PRIMARY KEY (key) > > ) WITH > > bloom_filter_fp_chance=0.010000 AND > > caching='ROWS_ONLY' AND > > comment='' AND > > dclocal_read_repair_chance=0.000000 AND > > gc_grace_seconds=864000 AND > > index_interval=128 AND > > read_repair_chance=0.100000 AND > > replicate_on_write='true' AND > > populate_io_cache_on_flush='false' AND > > default_time_to_live=0 AND > > speculative_retry='99.0PERCENTILE' AND > > memtable_flush_period_in_ms=0 AND > > compaction={'class': 'SizeTieredCompactionStrategy'} AND > > compression={'sstable_compression': 'LZ4Compressor'}; > > > > CREATE INDEX testc21_d_idx ON testc21 (d); > > > > select * from testc21 limit 10; > > key | d | v1 | v10 | v2 | v3 | v4 | v5 | v6 | v7 | v8 | v9 > > --------+---+----+-----+----+----+-----+----+----+----+----+----- > > 302602 | 1 | 56 | 55 | 26 | 45 | 67 | 75 | 25 | 50 | 26 | 54 > > 531141 | 1 | 90 | 77 | 86 | 42 | 76 | 91 | 47 | 31 | 77 | 27 > > 693077 | 1 | 67 | 71 | 14 | 59 | 100 | 90 | 11 | 15 | 6 | 19 > > 4317 | 1 | 70 | 77 | 44 | 77 | 41 | 68 | 33 | 0 | 99 | 14 > > 927961 | 1 | 15 | 97 | 95 | 80 | 35 | 36 | 45 | 8 | 11 | 100 > > 313395 | 1 | 68 | 62 | 56 | 85 | 14 | 96 | 43 | 6 | 32 | 7 > > 368168 | 1 | 3 | 63 | 55 | 32 | 18 | 95 | 67 | 78 | 83 | 52 > > 671830 | 1 | 14 | 29 | 28 | 17 | 42 | 42 | 4 | 6 | 61 | 93 > > 62693 | 1 | 26 | 48 | 15 | 22 | 73 | 94 | 86 | 4 | 66 | 63 > > 488360 | 1 | 8 | 57 | 86 | 31 | 51 | 9 | 40 | 52 | 91 | 45 > > Mike >