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https://issues.apache.org/jira/browse/CASSANDRA-2905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13067315#comment-13067315
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Brandon Williams commented on CASSANDRA-2905:
---------------------------------------------
Since we don't know how many times we should retry, or how long to wait between
retries, we should expose these tunables to the job configuration.
> 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
> 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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