Thanks! I updated replication factor to 2, and now when I took one node down all continued running (I did see Hector complaining on the node being down), but things were saved to db and read from it.
Just so I understand, now, having replication factor of 2, if I have 2 out of 3 nodes running all my read and writes with CL=1 should work, right? *Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Sun, Mar 18, 2012 at 9:57 AM, Watanabe Maki <watanabe.m...@gmail.com>wrote: > Because your RF is 1, so you need all nodes up. > > maki > > > On 2012/03/18, at 16:15, Tamar Fraenkel <ta...@tok-media.com> wrote: > > Hi! > I have a 3 node cassandra cluster. > I use Hector API. > > I give hecotr one of the node's IP address > I call setAutoDiscoverHosts(true) and setRunAutoDiscoveryAtStartup(true). > > The describe on one node returns: > > Replication Strategy: org.apache.cassandra.locator.SimpleStrategy > Durable Writes: true > Options: [replication_factor:1] > > The odd thing is that when I take one of the nodes down, expecting all to > continue running smoothly, I get exceptions of the format seen bellow, and > no read or write succeeds. When I bring the node back up, exceptions stop > and read and write resumes. > > Any idea or explanation why this is the case? > Thanks! > > > me.prettyprint.hector.api.exceptions.HUnavailableException: : May not be > enough replicas present to handle consistency level. > at > me.prettyprint.cassandra.service.ExceptionsTranslatorImpl.translate(ExceptionsTranslatorImpl.java:66) > at > me.prettyprint.cassandra.service.KeyspaceServiceImpl$7.execute(KeyspaceServiceImpl.java:285) > at > me.prettyprint.cassandra.service.KeyspaceServiceImpl$7.execute(KeyspaceServiceImpl.java:268) > at > me.prettyprint.cassandra.service.Operation.executeAndSetResult(Operation.java:103) > at > me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:246) > at > me.prettyprint.cassandra.service.KeyspaceServiceImpl.operateWithFailover(KeyspaceServiceImpl.java:131) > at > me.prettyprint.cassandra.service.KeyspaceServiceImpl.getSlice(KeyspaceServiceImpl.java:289) > at > me.prettyprint.cassandra.model.thrift.ThriftSliceQuery$1.doInKeyspace(ThriftSliceQuery.java:53) > at > me.prettyprint.cassandra.model.thrift.ThriftSliceQuery$1.doInKeyspace(ThriftSliceQuery.java:49) > at > me.prettyprint.cassandra.model.KeyspaceOperationCallback.doInKeyspaceAndMeasure(KeyspaceOperationCallback.java:20) > at > me.prettyprint.cassandra.model.ExecutingKeyspace.doExecute(ExecutingKeyspace.java:85) > at > me.prettyprint.cassandra.model.thrift.ThriftSliceQuery.execute(ThriftSliceQuery.java:48) > at > me.prettyprint.cassandra.service.ColumnSliceIterator.hasNext(ColumnSliceIterator.java:60) > at > > > *Tamar Fraenkel * > Senior Software Engineer, TOK Media > > <tokLogo.png> > > > ta...@tok-media.com > Tel: +972 2 6409736 > Mob: +972 54 8356490 > Fax: +972 2 5612956 > > > >
<<tokLogo.png>>
