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Posted to commits@cassandra.apache.org by jb...@apache.org on 2016/07/26 15:58:32 UTC
[04/12] cassandra git commit: update cassandra.yaml comments
post-CASSANDRA-10243
update cassandra.yaml comments post-CASSANDRA-10243
Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/48a45eda
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/48a45eda
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/48a45eda
Branch: refs/heads/trunk
Commit: 48a45eda50c7a8fc0e118dc4d14a3daf82146c08
Parents: 3d3359e
Author: Jonathan Ellis <jb...@apache.org>
Authored: Tue Jul 26 10:54:31 2016 -0500
Committer: Jonathan Ellis <jb...@apache.org>
Committed: Tue Jul 26 10:54:31 2016 -0500
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conf/cassandra.yaml | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
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http://git-wip-us.apache.org/repos/asf/cassandra/blob/48a45eda/conf/cassandra.yaml
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diff --git a/conf/cassandra.yaml b/conf/cassandra.yaml
index 7f2a6fa..db4cd37 100644
--- a/conf/cassandra.yaml
+++ b/conf/cassandra.yaml
@@ -656,12 +656,15 @@ cross_node_timeout: false
# more than one replica on the same "rack" (which may not actually
# be a physical location)
#
-# IF YOU CHANGE THE SNITCH AFTER DATA IS INSERTED INTO THE CLUSTER,
-# YOU MUST RUN A FULL REPAIR, SINCE THE SNITCH AFFECTS WHERE REPLICAS
-# ARE PLACED.
-#
-# IF THE RACK A REPLICA IS PLACED IN CHANGES AFTER THE REPLICA HAS BEEN
-# ADDED TO A RING, THE NODE MUST BE DECOMMISSIONED AND REBOOTSTRAPPED.
+# CASSANDRA WILL NOT ALLOW YOU TO SWITCH TO AN INCOMPATIBLE SNITCH
+# ONCE DATA IS INSERTED INTO THE CLUSTER. This would cause data loss.
+# This means that if you start with the default SimpleSnitch, which
+# locates every node on "rack1" in "datacenter1", your only options
+# if you need to add another datacenter are GossipingPropertyFileSnitch
+# (and the older PFS). From there, if you want to migrate to an
+# incompatible snitch like Ec2Snitch you can do it by adding new nodes
+# under Ec2Snitch (which will locate them in a new "datacenter") and
+# decommissioning the old ones.
#
# Out of the box, Cassandra provides
# - SimpleSnitch: