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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5290) Provide an option to build operator table once for built-in static functions and reuse it across queries.
Date Thu, 23 Feb 2017 13:32:44 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15880422#comment-15880422
] 

ASF GitHub Bot commented on DRILL-5290:
---------------------------------------

Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/757#discussion_r102711462
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/server/DrillbitContext.java
---
    @@ -189,6 +192,10 @@ public ScanResult getClasspathScan() {
     
       public RemoteFunctionRegistry getRemoteFunctionRegistry() { return functionRegistry.getRemoteFunctionRegistry();
}
     
    +  public DrillOperatorTable getOperatorTable() {
    --- End diff --
    
    Please add java doc explaining reasons why we are caching operator table and pointing
out to the USE_DYNAMIC_UDFS_KEY which triggers cached operator table usage.


> Provide an option to build operator table once for built-in static functions and reuse
it across queries.
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-5290
>                 URL: https://issues.apache.org/jira/browse/DRILL-5290
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.9.0
>            Reporter: Padma Penumarthy
>            Assignee: Padma Penumarthy
>              Labels: doc-impacting
>             Fix For: 1.10.0
>
>
> Currently, DrillOperatorTable which contains standard SQL operators and functions and
Drill User Defined Functions (UDFs) (built-in and dynamic) gets built for each query as part
of creating QueryContext. This is an expensive operation ( ~30 msec to build) and allocates
 ~2M on heap for each query. For high throughput, low latency operational queries, we quickly
run out of heap memory, causing JVM hangs. Build operator table once during startup for static
built-in functions and save in DrillbitContext, so we can reuse it across queries.
> Provide a system/session option to not use dynamic UDFs so we can use the operator table
saved in DrillbitContext and avoid building each time.
> *Please note, changes are adding new option exec.udf.use_dynamic which needs to be documented.*



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