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From "Julian Hyde (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5089) Skip initializing all enabled storage plugins for every query
Date Fri, 14 Apr 2017 02:38:42 GMT

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Julian Hyde commented on DRILL-5089:
------------------------------------

How are you able to call {{SimpleCalciteSchema.from}}? Isn't {{SimpleCalciteSchema}} package-private?

In CALCITE-1748 you ask to override a method that returns {{CalciteSchema}} but in CALCITE-911
we agreed that Drill wouldn't create your own CalciteSchema sub-classes. What has changed?

Can you take a look at CALCITE-1742, and tell me how it relates to your problem? I'd rather
fix Calcite's schema cache for Drill's and Phoenix's needs rather than let people drill holes
in our APIs.

> 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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