Add retry logic to ColumnFamilyRecordReader
-------------------------------------------
Key: CASSANDRA-2905
URL: https://issues.apache.org/jira/browse/CASSANDRA-2905
Project: Cassandra
Issue Type: Improvement
Reporter: Jeremy Hanna
Assignee: Jeremy Hanna
One thing that would improve the built-in ColumnFamilyRecordReader is some
retry logic if it times out on hasNext. It could help in addition to setting
the rpc_timeout_in_ms, so that timeouts happen less frequently so there are
fewer blacklisted task trackers (which are the result of an error, including
the timeout).
{code}
java.lang.RuntimeException: TimedOutException() at
org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.maybeInit(ColumnFamilyRecordReader.java:264)
at
org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.computeNext(ColumnFamilyRecordReader.java:279)
at
org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.computeNext(ColumnFamilyRecordReader.java:176)
at
com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136)
at
com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131)
at
org.apache.cassandra.hadoop.ColumnFamilyRecordReader.nextKeyValue(ColumnFamilyRecordReader.java:135)
at org.apache.cassandra.hadoop.pig.CassandraStorage.getNext(Unknown Source) at
org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigRecordReader.nextKeyValue(PigRecordReader.java:187)
at
org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:455)
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:646) at
org.apache.hadoop.mapred.MapTask.run(MapTask.java:322) at
org.apache.hadoop.mapred.Child$4.run(Child.java:268) at
java.security.AccessController.doPrivileged(Native Method) at
javax.security.auth.Subject.doAs(Subject.java:396) at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1115)
at org.apache.hadoop.mapred.Child.main(Child.java:262) Caused by:
TimedOutException() at
org.apache.cassandra.thrift.Cassandra$get_range_slices_result.read(Cassandra.java:12104)
at
org.apache.cassandra.thrift.Cassandra$Client.recv_get_range_slices(Cassandra.java:732)
at
org.apache.cassandra.thrift.Cassandra$Client.get_range_slices(Cassandra.java:704)
at
org.apache.cassandra.hadoop.ColumnFamilyRecordReader$RowIterator.maybeInit(ColumnFamilyRecordReader.java:242)
... 17 more
{code}
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
