from http://www.datastax.com/docs/0.8/consistency/index:
<A “quorum” of replicas is essentially a majority of replicas, or RF / 2 + 1 with any resulting fractions rounded down.> I have RF=2, so majority of replicas is 2/2+1=2 which I have after 3rd node goes down? On Fri, Sep 2, 2011 at 1:22 PM, Nate McCall <n...@datastax.com> wrote: > It looks like you only have 2 replicas configured in each data center? > > If so, LOCAL_QUORUM cannot be achieved with a host down same as with > QUORUM on RF=2 in a single DC cluster. > > On Fri, Sep 2, 2011 at 1:40 PM, Oleg Tsvinev <oleg.tsvi...@gmail.com> wrote: >> I believe I don't quite understand semantics of this exception: >> >> me.prettyprint.hector.api.exceptions.HUnavailableException: : May not >> be enough replicas present to handle consistency level. >> >> Does it mean there *might be* enough? >> Does it mean there *is not* enough? >> >> My case is as following - I have 3 nodes with keyspaces configured as >> following: >> >> Replication Strategy: org.apache.cassandra.locator.NetworkTopologyStrategy >> Durable Writes: true >> Options: [DC2:2, DC1:2] >> >> Hector can only connect to nodes in DC1 and configured to neither see >> nor connect to nodes in DC2. This is for replication by Cassandra >> means, asynchronously between datacenters DC1 and DC2. Each of 6 total >> nodes can see any of the remaining 5. >> >> and inserts with LOCAL_QUORUM CL work fine when all 3 nodes are up. >> However, this morning one node went down and I started seeing the >> HUnavailableException: : May not be enough replicas present to handle >> consistency level. >> >> I believed if I have 3 nodes and one goes down, two remaining nodes >> are sufficient for my configuration. >> >> Please help me to understand what's going on. >> >