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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5089) Skip initializing all enabled storage plugins for every query
Date Sun, 26 Mar 2017 05:46:43 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15942164#comment-15942164

ASF GitHub Bot commented on DRILL-5089:

Github user paul-rogers commented on a diff in the pull request:

    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/SchemaTreeProvider.java
    @@ -119,6 +127,74 @@ public SchemaPlus createRootSchema(SchemaConfig schemaConfig) {
    +  public SchemaPlus createPartialRootSchema(final String userName, final SchemaConfigInfoProvider
    +                                            final String storage) {
    +    final String schemaUser = isImpersonationEnabled ? userName : ImpersonationUtil.getProcessUserName();
    +    final SchemaConfig schemaConfig = SchemaConfig.newBuilder(schemaUser, provider).build();
    +    final SchemaPlus rootSchema = SimpleCalciteSchema.createRootSchema(false);
    +    Set<String> storageSet = Sets.newHashSet();
    +    storageSet.add(storage);
    +    addNewStoragesToRootSchema(schemaConfig, rootSchema, storageSet);
    +    schemaTreesToClose.add(rootSchema);
    --- End diff --
    There is quite a bit of plumbing here to get right -- for each new schema added. Please
factor out the common code into a (private) implementation method. Else, we'll be chasing
bugs forever as people modify one copy but miss the others.

> Skip initializing all enabled storage plugins for every query
> -------------------------------------------------------------
>                 Key: DRILL-5089
>                 URL: https://issues.apache.org/jira/browse/DRILL-5089
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Query Planning & Optimization
>    Affects Versions: 1.9.0
>            Reporter: Abhishek Girish
>            Assignee: Chunhui Shi
>            Priority: Critical
> In a query's lifecycle, at attempt is made to initialize each enabled storage plugin,
while building the schema tree. This is done regardless of the actual plugins involved within
a query. 
> Sometimes, when one or more of the enabled storage plugins have issues - either due to
misconfiguration or the underlying datasource being slow or being down, the overall query
time taken increases drastically. Most likely due the attempt being made to register schemas
from a faulty plugin.
> For example, when a jdbc plugin is configured with SQL Server, and at one point the underlying
SQL Server db goes down, any Drill query starting to execute at that point and beyond begin
to slow down drastically. 
> We must skip registering unrelated schemas (& workspaces) for a query. 

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