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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-1198) C++ DrillClient need to negotiate with Zookeeper quorum if/when an assigned DrillBit fails
Date Sun, 04 Jan 2015 21:29:49 GMT

     [ https://issues.apache.org/jira/browse/DRILL-1198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jacques Nadeau updated DRILL-1198:
----------------------------------
    Priority: Minor  (was: Major)

> 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
>            Assignee: Parth Chandra
>            Priority: Minor
>             Fix For: 0.8.0
>
>
> 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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