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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-1442) C++ Client - Synchronous API appears to hang when running many queries in parallel
Date Sun, 04 Jan 2015 21:28:46 GMT

     [ https://issues.apache.org/jira/browse/DRILL-1442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jacques Nadeau updated DRILL-1442:
    Fix Version/s: 0.9.0

> C++ Client - Synchronous API appears to hang when running many queries in parallel
> ----------------------------------------------------------------------------------
>                 Key: DRILL-1442
>                 URL: https://issues.apache.org/jira/browse/DRILL-1442
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Client - C++
>    Affects Versions: 0.5.0
>            Reporter: Parth Chandra
>            Assignee: Parth Chandra
>             Fix For: 0.9.0
> The C++ client library has a synchronous version that allows a client application to
submit multiple queries asynchronously but retrieve results in synchronously.
> A situation may occur where the application may submit several large queries and then
choose to process the results of the last submitted query first. In this case the client library
buffers up the results of the first few queries and may hit  its memory allocation limit before
the last queries results are retrieved. 
> The client app then deadlocks as the last query waits for more memory and the first few
queries wait for the app to consume the results.
> Technically this would qualify as a client application bug, but the client library should
prevent or break the deadlock if it can.
> At the vary least, the querySubmitter example program should not suffer from this issue.

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