Todd Lipcon created KUDU-1802:
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Summary: Deserializing scan tokens should avoid round-trip to
master
Key: KUDU-1802
URL: https://issues.apache.org/jira/browse/KUDU-1802
Project: Kudu
Issue Type: Improvement
Components: client, perf
Affects Versions: 1.2.0
Reporter: Todd Lipcon
Currently, KuduScanToken::DeserializeIntoScanner calls KuduClient::OpenTable()
which makes a GetTableSchema call to the master. This round trip is a bit
expensive because it's always a "thundering herd" for an Impala query or Spark
job -- every host deserializes a bunch of scan tokens at the same time and ends
up having to back off.
We should consider some ways to avoid this.
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