[
https://issues.apache.org/jira/browse/KUDU-1802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Grant Henke updated KUDU-1802:
------------------------------
Labels: impala ramp-up (was: ramp-up)
> 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
> Assignee: Grant Henke
> Priority: Major
> Labels: impala, ramp-up
>
> 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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
