Hi Francis

Looks like the logs didn’t get attached.

As for the physical plan, ignore the “memory = 0.0” ; because it is a physical plan and not the actual executed query’s profile.

What you want to do to debug the possible area where the memory is being consumed is in the query’s profile page.

This will tell you which is the longest running major fragment:
http://<hostname>:8047/profiles/<queryId>#fragment-overview<http://%3chostname%3e:8047/profiles/%3cqueryId%3e#fragment-overview>
You’re looking for the Max Peak Memory column to see which ones are holding the most memory.

http://<hostname>:8047/profiles/<queryId>#operator-overview<http://%3chostname%3e:8047/profiles/%3cqueryId%3e#operator-overview>
And this will tell you the statistics for the various operators’ consumption of memory.

For running such a query through the WebUI is generally not recommended, because (by design), the WebUI creates a ResultSetListener in the Drillbit where it holds all the records before sending anything back. (https://issues.apache.org/jira/browse/DRILL-6050)

However, for Tableau, the DrillClient should have been consuming the records, so I’m wondering why Drillbit should run out of memory .

Could you share the following for both scenarios (the Web UI and when running via Tableau)?

  1.  The profiles
  2.  The Drillbit logs (drillbit.out, drillbit.log, etc)

Thanks
Kunal

From: Francis McGregor-Macdonald [mailto:[EMAIL PROTECTED]]
Sent: Sunday, January 28, 2018 2:49 PM
To: [EMAIL PROTECTED]
Subject: Re: Fwd: Creating a Tableau extracts with Drill 1.12 uses unlimited memory

Hi all,

A physical plan attached ... all memory appears to be 0.0 which seems odd?

Thanks

On Sun, Jan 28, 2018 at 10:37 PM, Francis McGregor-Macdonald <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
And with logs as attachments.

On Sun, Jan 28, 2018 at 9:40 PM, Francis McGregor-Macdonald <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
Thanks Paul and Kunal,
I think I have the right information now. With Paul's changes (and fixing up a zoo.cfg error) it isn't crashing, rather failing. Logs attached, still blowing past memory limits. It does the same thing when re-running the query from the web console so presumably its not actually Tableau related despite me first generating it that way.

Thanks.

On Sat, Jan 27, 2018 at 1:15 PM, Francis McGregor-Macdonald <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
Thanks Paul,

I will update with your suggested memory allocations also and retry.

Zookeeper crashed too which might explain more? I have attached the logs from Zookeeper too.

Thanks

On Sat, Jan 27, 2018 at 6:45 AM, Paul Rogers <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
Hi Francis,

Thanks much for the log. The log shows running a query, then immediately shows entries that occur when starting Drill. I'm guessing that Drill literally crashed at this point? This is more severe than the usual error in which a query exhausts memory.

Some general observations. The Drill memory is 60 GB, but system memory is 61 GB. Perhaps try dropping total Drill memory some to give the OS and other tasks more headroom. For a SELECT * memory, Drill needs far less than what you have, so maybe try giving Drill 48 GB total.

Then, Drill needs direct memory much more than heap. So, maybe give Drill 39 GB direct, 8 GB heap and 1 GB (the default) for code cache. These settings are in drill-env.sh.

Kunal, you have more experience with these issues. Can you make additional suggestions by looking at the log?

Thanks,

- Paul
On Thursday, January 25, 2018, 10:20:29 PM PST, Francis McGregor-Macdonald <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
Hi all,

I am guessing that each of your EMR nodes are quite large? EMR nodes are: r4.2xlarge ('vcpu': 8, 'memory': 61)

Property "planner.width.max_per_node" is set to = 6

What is the system memory and what are the allocations for heap and direct?
System Memory: 61GB (EMR nodes above)
drill_mem_heap: 12G
drill_mem_max: 48G

The view is simple: SELECT * FROM s3://myparquet.parquet (14GB)

planner.memory.max_query_memor y_per_node = 10479720202

Drillbit.log attached (I think I have the correct selection included).

Thanks

On Fri, Jan 26, 2018 at 2:41 PM, Kunal Khatua <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>> wrote:
What is the system memory and what are the allocations for heap and direct? The memory crash might be occurring due to insufficient heap. The limits parameter applies to the direct memory and not Heap.

Can you share details in the logs from the crash?

From: Timothy Farkas [mailto:[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>]
Sent: Thursday, January 25, 2018 2:58 PM
To: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>
Subject: Re: Creating a Tableau extracts with Drill 1.12 uses unlimited memory

Hi Francis,

I am guessing that each of your EMR nodes are quite large (32 or 64 vcpus). On large machines Drill's planner over parallelizes and over allocates memory. There is a property "planner.width.max_per_node" which limits the number of operators that can simultaneously execute on a Drillbit for a query. If you configure the width per node to something like 5 or 10 (you may have to play around with it) things should start working.

Thanks,
Tim

______________________________ __
From: Francis McGregor-Macdonald <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
Sent: Thursday, January 25, 2018 1:58:22 PM
To: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>
Subject: Creating a Tableau extracts with Drill 1.12 uses unlimited memory

Creating a creating a Tableau (with 10.3, 10.5 desktop) extract from a Drill (1.12 on EMR) cluster memory appears not to adhere to the limits set by planner.memory.max_query_memor y_per_node.

The extract query consumes all memory and then crashes drill.

Running the same query as a create table memory behaves as expected.

The query complexity is trivial:
select * from view only a single parquet with no calculated fields.