>From the yamls .143 initial_token: 0 .145 initial_token: 56713727820156410577229101238628035242 .146 initial_token: 113427455640312821154458202477256070485
From: Tycen Stafford [mailto:tstaff...@medio.com] Sent: Wednesday, March 20, 2013 10:43 AM To: user@cassandra.apache.org Subject: RE: Question regarding multi datacenter and LOCAL_QUORUM Did you alternate your tokens? I may be off base - but if not then that's why you might be seeing cross-dc request. -Tycen From: Dwight Smith [mailto:dwight.sm...@genesyslab.com] Sent: Wednesday, March 20, 2013 10:30 AM To: user@cassandra.apache.org<mailto:user@cassandra.apache.org> Subject: Question regarding multi datacenter and LOCAL_QUORUM Hi I have 2 data centers - with 3 nodes in each DC - version 1.1.6 - replication factor 2 - topology properties: # Cassandra Node IP=Data Center:Rack xx.yy.zz.143=AZ1:RAC1 xx.yy.zz.145=AZ1:RAC1 xx.yy.zz.146=AZ1:RAC1 xx.yy.zz.147=AZ2:RAC2 xx.yy.zz.148=AZ2:RAC2 xx.yy.zz.149=AZ2:RAC2 Using LOCAL_QUORUM, my understanding was that reads/writes would process locally ( for the coordinator ) and send requests to the remaining nodes in the DC, but in the system log for 146 I observe that this is not the case, extract from the log: DEBUG [Thrift:1] 2013-03-19 00:00:53,312 CassandraServer.java (line 306) get_slice DEBUG [Thrift:1] 2013-03-19 00:00:53,313 ReadCallback.java (line 79) Blockfor is 2; setting up requests to /xx.yy.zz.146,/xx.yy.zz.143,/xx.yy.zz.145 DEBUG [Thrift:1] 2013-03-19 00:00:53,334 CassandraServer.java (line 306) get_slice DEBUG [Thrift:1] 2013-03-19 00:00:53,334 ReadCallback.java (line 79) Blockfor is 2; setting up requests to /xx.yy.zz.146,/xx.yy.zz.143 DEBUG [Thrift:1] 2013-03-19 00:00:53,366 CassandraServer.java (line 306) get_slice DEBUG [Thrift:1] 2013-03-19 00:00:53,367 ReadCallback.java (line 79) Blockfor is 2; setting up requests to /xx.yy.zz.146,/xx.yy.zz.143,/xx.yy.zz.145 DEBUG [Thrift:1] 2013-03-19 00:00:53,391 CassandraServer.java (line 589) batch_mutate DEBUG [Thrift:1] 2013-03-19 00:00:53,418 CassandraServer.java (line 589) batch_mutate DEBUG [Thrift:1] 2013-03-19 00:00:53,429 CassandraServer.java (line 306) get_slice DEBUG [Thrift:1] 2013-03-19 00:00:53,429 ReadCallback.java (line 79) Blockfor is 2; setting up requests to /xx.yy.zz.146,/xx.yy.zz.145 DEBUG [Thrift:1] 2013-03-19 00:00:53,441 CassandraServer.java (line 306) get_slice DEBUG [Thrift:1] 2013-03-19 00:00:53,441 ReadCallback.java (line 79) Blockfor is 2; setting up requests to /xx.yy.zz.146,/xx.yy.zz.143 The batch mutates are as expected - locally, two replicas, and hints to DC AZ2, but why the unexpected behavior for the get_slice requests. This is observed throughout the log. Thanks much
