See http://wiki.apache.org/cassandra/HadoopSupport#Troubleshooting - I would probably start with setting your rpc_timeout_in_ms to something like 30000.
On Jul 28, 2011, at 11:09 AM, Jian Fang wrote: > Hi, > > I run Cassandra 0.8.2 and hadoop 0.20.2 on three nodes, each node includes a > Cassandra instance and a hadoop data node. > I created a simple hadoop job to scan a Cassandra column value in a column > family and write it to a file system if it meets some conditions. > I keep getting the following timeout exceptions. Is this caused by my > settings in Cassandra? Or how could I change the timeout value on the > Cassandra Hadoop API to get around this problem? > > > 11/07/28 12:02:47 INFO mapred.JobClient: Task Id : > attempt_201107281151_0001_m_000052_0, Status : FAILED > java.lang.RuntimeException: TimedOutException() > at > org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.maybeInit(ColumnFamilyRecordReader.java:265) > at > org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.computeNext(ColumnFamilyRecordReader.java:279) > at > org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.computeNext(ColumnFamilyRecordReader.java:177) > at > com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:140) > at > com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:135) > at > org.apache.cassandra.hadoop.ColumnFamilyRecordReader.nextKeyValue(ColumnFamilyRecordReader.java:136) > at > org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:423) > at org.apache.hadoop.mapreduce.MapContext.nextKeyValue(MapContext.java:67) > at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:143) > at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:621) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:305) > at org.apache.hadoop.mapred.Child.main(Child.java:170) > Caused by: TimedOutException() > at > org.apache.cassandra.thrift.Cassandra$get_range_slices_result.read(Cassandra.java:12590) > at > org.apache.cassandra.thrift.Cassandra$Client.recv_get_range_slices(Cassandra.java:762) > at > org.apache.cassandra.thrift.Cassandra$Client.get_range_slices(Cassandra.java:734) > at > org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.maybeInit(ColumnFamilyRecordReader.java:243) > ... 11 more > > Thanks in advance, > > John
