[jira] [Created] (KUDU-3139) Add thread-safe KuduPartitioner::PartitionRow() method

["Tim Armstrong (Jira)" <ji...@apache.org>]

Tim Armstrong created KUDU-3139:
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             Summary: Add thread-safe KuduPartitioner::PartitionRow() method
                 Key: KUDU-3139
                 URL: https://issues.apache.org/jira/browse/KUDU-3139
             Project: Kudu
          Issue Type: Improvement
          Components: client
            Reporter: Tim Armstrong


We have a scenario in IMPALA-9782 where we'd like to have multiple threads use KuduPartitioner, but this currently requires instantiating many instances, which is somewhat expensive. It would be a good improvement if we could share the KuduPartitioner. This currently doesn't work because PartitionRow() internally uses a buffer that's a member of the object - https://github.com/cloudera/kudu/blob/master/src/kudu/client/partitioner-internal.cc#L40

I talked with [~aserbin] on slack and he suggested that adding a new method that is not stateful would be a good way to solve this (I also considered cloning KuduPartitioner).



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