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From: Patrik Modesto <patrik.modesto@gmail.com>
Date: Tue, 2 Aug 2011 16:22:45 +0200
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Subject: RF=1
To: user@cassandra.apache.org
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Hi all!

I've a test cluster of 4 nodes running cassandra 0.7.8, with one
keyspace with RF=1, each node owns 25% of the data. As long as all
nodes are alive, there is no problem, but when I shut down just one
node I get UnavailableException in my application. cassandra-cli
returns "null" and hadoop mapreduce task won't start at all.

Loosing one node is not a problem for me, the data are not important,
loosing even half the cluster is not a problem as long as everything
runs just as with a full cluster.

The error from hadoop is like this:
Exception in thread "main" java.io.IOException: Could not get input splits
        at org.apache.cassandra.hadoop.ColumnFamilyInputFormat.getSplits(ColumnFamilyInputFormat.java:120)
        at cz.xxx.yyy.zzz.DelegatingInputFormat.getSplits(DelegatingInputFormat.java:111)
        at org.apache.hadoop.mapred.JobClient.writeNewSplits(JobClient.java:944)
        at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:961)
        at org.apache.hadoop.mapred.JobClient.access$500(JobClient.java:170)
        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:880)
        at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:833)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:396)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
        at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:833)
        at org.apache.hadoop.mapreduce.Job.submit(Job.java:476)
        at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:506)
        at cz.xxx.yyy.zzz.ContextIndexer.run(ContextIndexer.java:663)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
        at cz.xxx.yyy.zzz.ContextIndexer.main(ContextIndexer.java:94)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:186)
Caused by: java.util.concurrent.ExecutionException:
java.io.IOException: failed connecting to all endpoints 10.0.18.87
        at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
        at java.util.concurrent.FutureTask.get(FutureTask.java:83)
        at org.apache.cassandra.hadoop.ColumnFamilyInputFormat.getSplits(ColumnFamilyInputFormat.java:116)
        ... 20 more
Caused by: java.io.IOException: failed connecting to all endpoints 10.0.18.87
        at org.apache.cassandra.hadoop.ColumnFamilyInputFormat.getSubSplits(ColumnFamilyInputFormat.java:197)
        at org.apache.cassandra.hadoop.ColumnFamilyInputFormat.access$200(ColumnFamilyInputFormat.java:67)
        at org.apache.cassandra.hadoop.ColumnFamilyInputFormat$SplitCallable.call(ColumnFamilyInputFormat.java:153)
        at org.apache.cassandra.hadoop.ColumnFamilyInputFormat$SplitCallable.call(ColumnFamilyInputFormat.java:138)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)