[jira] [Resolved] (CASSANDRA-2905) Add retry logic to ColumnFamilyRecordReader

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-2905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis resolved CASSANDRA-2905.
---------------------------------------

    Resolution: Later
      Assignee:     (was: Jeremy Hanna)

CASSANDRA-4705 makes this mostly obsolete except for coordinator failure.
                
> 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
>            Priority: Minor
>              Labels: hadoop
>
> 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).
> {quote}
> 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
> {quote}

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