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Posted to commits@cassandra.apache.org by "Matthew F. Dennis (JIRA)" <ji...@apache.org> on 2011/03/16 19:35:29 UTC
[jira] Updated: (CASSANDRA-2338) C* consistency level needs to be
pluggable
[ https://issues.apache.org/jira/browse/CASSANDRA-2338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matthew F. Dennis updated CASSANDRA-2338:
-----------------------------------------
Description:
for cases where people want to run C* across multiple DCs for disaster recovery et cetera where normal operations only happen in the first DC (e.g. no writes/reads happen in the remove DC under normal operation) neither LOCAL_QUORUM or EACH_QUORUM really suffices.
Consider the case with RF of DC1:3 DC2:2
LOCAL_QUORUM doesn't provide any guarantee that data is in the remote DC.
EACH_QUORUM requires that both nodes in the remote DC are up.
It would be useful in some situations to be able to specify a strategy where LOCAL_QUORUM is used for the local DC and at least one in a remote DC (and/or at least in *each* remote DC).
was:
for cases where people want to run C* across multiple DCs for disaster recovery et cetera where normal operations only happen in the first DC (e.g. no writes/reads happen in the remove DC under normal operation) neither LOCAL_QUORUM or EACH_QUORUM really suffices.
Consider the case with RF of DC1:3 DC2:2
LOCAL_QUORUM doesn't provide any guarantee that data is in the remote DC.
EACH_QUORUM requires that both nodes in the remote DC are up.
It would be useful in some situations to be able to specify a LOCAL_QUORUM (for local consistency) + "at least one remote" for durability/disaster proofing.
Summary: C* consistency level needs to be pluggable (was: C* needs a LOCAL_QUORUM_PLUS_ONE_REMOTE consistency level)
> C* consistency level needs to be pluggable
> ------------------------------------------
>
> Key: CASSANDRA-2338
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2338
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Matthew F. Dennis
> Priority: Minor
>
> for cases where people want to run C* across multiple DCs for disaster recovery et cetera where normal operations only happen in the first DC (e.g. no writes/reads happen in the remove DC under normal operation) neither LOCAL_QUORUM or EACH_QUORUM really suffices.
> Consider the case with RF of DC1:3 DC2:2
> LOCAL_QUORUM doesn't provide any guarantee that data is in the remote DC.
> EACH_QUORUM requires that both nodes in the remote DC are up.
> It would be useful in some situations to be able to specify a strategy where LOCAL_QUORUM is used for the local DC and at least one in a remote DC (and/or at least in *each* remote DC).
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