George Chow created DRILL-1198:
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Summary: C++ DrillClient need to negotiate with Zookeeper quorum
if/when an assigned DrillBit fails
Key: DRILL-1198
URL: https://issues.apache.org/jira/browse/DRILL-1198
Project: Apache Drill
Issue Type: Improvement
Components: Client - C++
Reporter: George Chow
Current DrillClient does not recover from a DrillBit failure when the
connection is initiated via a Zookeeper quorum.
This JIRA covers adding this capability to the C++ DrillClient.
The key question to consider: how far does the DrillClient go in recovering the
connection? One interesting example to consider if when the DrillBit fails in
the middle of a query.
Scenario:
1. An app connects via ODBC to a Drill cluster via the ZK quorum. ZK assigns a
Drillbit node1 to the connection.
2. The app issues a query and node1 starts processing the query and returns 2
RecordBatches back
3. node1 fails.
4. DrillClient detects the loss of node1 and negotiates with the quorum for a
replacement, node2
5. Question: does DrillClient try to re-execute the query and skip over the
first two RecordBatches (since DrillClient knows that was the state of the
connection to node1)?
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