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https://issues.apache.org/jira/browse/DRILL-5098?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Ollala updated DRILL-5098:
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Reviewer: Chun Chang (was: Paul Rogers)
> Improving fault tolerance for connection between client and foreman node.
> -------------------------------------------------------------------------
>
> Key: DRILL-5098
> URL: https://issues.apache.org/jira/browse/DRILL-5098
> Project: Apache Drill
> Issue Type: Improvement
> Components: Client - JDBC
> Reporter: Sorabh Hamirwasia
> Assignee: Sorabh Hamirwasia
> Labels: doc-impacting, ready-to-commit
> Fix For: 1.10.0
>
>
> With DRILL-5015 we allowed support for specifying multiple Drillbits in
> connection string and randomly choosing one out of it. Over time some of the
> Drillbits specified in the connection string may die and the client can fail
> to connect to Foreman node if random selection happens to be of dead Drillbit.
> Even if ZooKeeper is used for selecting a random Drillbit from the registered
> one there is a small window when client selects one Drillbit and then that
> Drillbit went down. The client will fail to connect to this Drillbit and
> error out.
> Instead if we try multiple Drillbits (configurable tries count through
> connection string) then the probability of hitting this error window will
> reduce in both the cases improving fault tolerance. During further
> investigation it was also found that if there is Authentication failure then
> we throw that error as generic RpcException. We need to improve that as well
> to capture this case explicitly since in case of Auth failure we don't want
> to try multiple Drillbits.
> Connection string example with new parameter:
> jdbc:drill:drillbit=<node name>[:<port>][,<node name2>[:<port>]...;tries=5
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