I am experiencing huge latencies with a multi-data center Cassandra cluster. With consistency level ONE, I expected almost the same latency with the single data center setup. What could possibly affect the latency in multi-data center setup?
multi-DC setup min max avg (ms) 1 969 164.554264 single-DC setup min max avg (ms) 1 51 2.371786 I am using the Datastax Java client library ( https://github.com/datastax/java-driver). This is the keyspace description. ~/work/cassandra/bin$ ./cqlsh `hostname` Connected to cdbp at mdc-s70:9160. [cqlsh 3.1.7 | Cassandra 1.2.9-SNAPSHOT | CQL spec 3.0.0 | Thrift protocol 19.36.0] Use HELP for help. cqlsh> desc keyspace pbdp; CREATE KEYSPACE pbdp WITH replication = { 'class': 'NetworkTopologyStrategy', 'DC2': '1', 'DC3': '1', 'DC0': '1', 'DC1': '1' }; USE pbdp; CREATE TABLE tweet ( tid bigint PRIMARY KEY, created_at_rt bigint, created_at_st text, lati float, longi float, real_coord boolean, sn text, text_ text ) WITH bloom_filter_fp_chance=0.010000 AND caching='KEYS_ONLY' AND comment='' AND dclocal_read_repair_chance=0.000000 AND gc_grace_seconds=864000 AND read_repair_chance=0.100000 AND replicate_on_write='true' AND populate_io_cache_on_flush='false' AND compaction={'class': 'SizeTieredCompactionStrategy'} AND compression={'sstable_compression': 'SnappyCompressor'}; Thanks, Hobin