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 > > >
