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Posted to dev@hive.apache.org by Shyam Sarkar <sh...@yahoo.com> on 2009/03/11 22:48:37 UTC

Call sequence

Hello,

I am trying to understand the call sequence of Java classes from the top level (command processor). I can see Parser and Lexer generated by Antlr. Can someone please help me on the call sequence ?  Where is the front level command processor that collects a query as a string and then calls parser?

thanks,
shyam_sarkar@yahoo.com

Re: Call sequence

Posted by Shyam Sarkar <sh...@yahoo.com>.
Thank you. 


--- On Wed, 3/11/09, Prasad Chakka <pr...@facebook.com> wrote:

> From: Prasad Chakka <pr...@facebook.com>
> Subject: Re: Call sequence
> To: "hive-dev@hadoop.apache.org" <hi...@hadoop.apache.org>, "shyam_sarkar@yahoo.com" <sh...@yahoo.com>
> Date: Wednesday, March 11, 2009, 3:11 PM
> Hi Shyam,
> 
> I find Eclipse especially useful for these kind of things.
> Follow the instructions at
> http://wiki.apache.org/hadoop/Hive/GettingStarted/EclipseSetup
> and run a unit test in debug mode and observe the stack.
> 
> Thanks,
> Prasad
> 
> 
> ________________________________
> From: Ashish Thusoo <at...@facebook.com>
> Reply-To: <hi...@hadoop.apache.org>
> Date: Wed, 11 Mar 2009 15:08:13 -0700
> To: <hi...@hadoop.apache.org>,
> <sh...@yahoo.com>
> Subject: RE: Call sequence
> 
> That should be Driver.java. Look at the run() method. That
> calls ParseDriver.parse() to get the AST. And them
> sem.analyze() to do semantic analysis, optimization and plan
> generation. Finally it goes through the Task list and runs
> the tasks according to the dependencies.
> 
> Ashish
> 
> -----Original Message-----
> From: Shyam Sarkar [mailto:shyam_sarkar@yahoo.com]
> Sent: Wednesday, March 11, 2009 2:49 PM
> To: hive-dev@hadoop.apache.org
> Subject: Call sequence
> 
> 
> Hello,
> 
> I am trying to understand the call sequence of Java classes
> from the top level (command processor). I can see Parser and
> Lexer generated by Antlr. Can someone please help me on the
> call sequence ?  Where is the front level command processor
> that collects a query as a string and then calls parser?
> 
> thanks,
> shyam_sarkar@yahoo.com

Re: Call sequence

Posted by Prasad Chakka <pr...@facebook.com>.
Hi Shyam,

I find Eclipse especially useful for these kind of things. Follow the instructions at http://wiki.apache.org/hadoop/Hive/GettingStarted/EclipseSetup and run a unit test in debug mode and observe the stack.

Thanks,
Prasad


________________________________
From: Ashish Thusoo <at...@facebook.com>
Reply-To: <hi...@hadoop.apache.org>
Date: Wed, 11 Mar 2009 15:08:13 -0700
To: <hi...@hadoop.apache.org>, <sh...@yahoo.com>
Subject: RE: Call sequence

That should be Driver.java. Look at the run() method. That calls ParseDriver.parse() to get the AST. And them sem.analyze() to do semantic analysis, optimization and plan generation. Finally it goes through the Task list and runs the tasks according to the dependencies.

Ashish

-----Original Message-----
From: Shyam Sarkar [mailto:shyam_sarkar@yahoo.com]
Sent: Wednesday, March 11, 2009 2:49 PM
To: hive-dev@hadoop.apache.org
Subject: Call sequence


Hello,

I am trying to understand the call sequence of Java classes from the top level (command processor). I can see Parser and Lexer generated by Antlr. Can someone please help me on the call sequence ?  Where is the front level command processor that collects a query as a string and then calls parser?

thanks,
shyam_sarkar@yahoo.com

RE: Call sequence

Posted by Ashish Thusoo <at...@facebook.com>.
That should be Driver.java. Look at the run() method. That calls ParseDriver.parse() to get the AST. And them sem.analyze() to do semantic analysis, optimization and plan generation. Finally it goes through the Task list and runs the tasks according to the dependencies.

Ashish 

-----Original Message-----
From: Shyam Sarkar [mailto:shyam_sarkar@yahoo.com] 
Sent: Wednesday, March 11, 2009 2:49 PM
To: hive-dev@hadoop.apache.org
Subject: Call sequence


Hello,

I am trying to understand the call sequence of Java classes from the top level (command processor). I can see Parser and Lexer generated by Antlr. Can someone please help me on the call sequence ?  Where is the front level command processor that collects a query as a string and then calls parser?

thanks,
shyam_sarkar@yahoo.com