The slowness you’re seeing when you have additional storage plugins that are
not being used by your query is due to DRILL-5089.
-- Zelaine
On 3/7/17, 11:20 PM, "PROJJWAL SAHA" <proj.s...@gmail.com> wrote:
Hi Kunal,
Good catch ! Thanks for this pointer.
I enabled logging at org.apache.drill level and I found -
2017-03-08 01:39:01,822 [274058fa-79df-9c74-3219-3fcb83a04605:foreman] INFO
o.a.drill.exec.work.foreman.Foreman - Query text for query id
274058fa-79df-9c74-3219-3fcb83a04605: explain plan for select * from
dfs.root.`/scratch/localdisk/drill/testdata/Cust_1G_20_tsv` where
ORDER_ID='41' and CUSTOMER_ID='568'
*2017-03-08 01:39:01,823 [274058fa-79df-9c74-3219-3fcb83a04605:foreman]
DEBUG o.a.d.e.s.h.HBaseStoragePluginConfig - Initializing HBase
StoragePlugin configuration with zookeeper quorum 'localhost', port '2181'.*
*2017-03-08 01:39:16,038 [274058fa-79df-9c74-3219-3fcb83a04605:foreman]
DEBUG o.a.drill.exec.store.SchemaFactory - Took 14214 ms to register
schemas.*
i am not sure why the hbase storage plugin comes in play as it is disabled.
i then disabled all the other active plugins that i had and just kept the
dfs plugin.
the planning time is now reduced to 0.9 secs
and the query time for 1GB partitioned tsv data is taking 3.63 secs
is that a reasonable behaviour ?
Regards,
Projjwal
On Wed, Mar 8, 2017 at 12:11 AM, Kunal Khatua <kkha...@mapr.com> wrote:
>
> Looking at the 1st two lines of the log shows that the bulk of time was
> lost before the query even went into the real planning stage of the query:
>
>
> 2017-03-07 06:27:28,074 [274166de-f543-3fa7-ef9e-8e9e87d5d6a0:foreman]
> INFO o.a.drill.exec.work.foreman.Foreman - Query text for query id
> 274166de-f543-3fa7-ef9e-8e9e87d5d6a0: select columns[0] from
> dfs.root.`/scratch/localdisk/drill/testdata/Cust_1G_20_tsv` where
> columns[0] ='41' and columns[3] ='568'
> 2017-03-07 06:28:00,775 [274166de-f543-3fa7-ef9e-8e9e87d5d6a0:foreman]
> INFO o.a.d.exec.store.dfs.FileSelection - FileSelection.getStatuses()
> took 0 ms, numFiles: 1
>
>
> More than 30 secs is unaccounted for. Can you turn on the root logger to
> be at the debug level and retry the explain plan?
>
>
> Kunal Khatua
>
>
> ________________________________
> From: rahul challapalli <challapallira...@gmail.com>
> Sent: Tuesday, March 7, 2017 5:24:43 AM
> To: user
> Subject: Re: Minimise query plan time for dfs plugin for local file system
> on tsv file
>
> I did not get a chance to review the log file.
>
> However the next thing I would try is to make your cluster a single node
> cluster first and then run the same explain plan query separately on each
> individual file.
>
>
>
> On Mar 7, 2017 5:09 AM, "PROJJWAL SAHA" <proj.s...@gmail.com> wrote:
>
> > Hi Rahul,
> >
> > thanks for your suggestions. However, I am still not able to see any
> > reduction in query planning time
> > by explicit column names, removing extract headers and using
> columns[index]
> >
> > As I said, I ran explain plan and its taking 30+ secs for me.
> > My data is 1 GB tsv split into 20 files of 5 MB each.
> > Each 5MB file has close to 50k records
> > Its a 5 node cluster, and width per node is 4
> > Therefore, total number of minor fragments for one major fragment is 20
> > I have copied the source directory in all the drillbit nodes
> >
> > can you tell me a reasonable time estimate which I can expect drill to
> > return result for query for the above described scenario.
> > Query is - select columns[0] from dfs.root.`/scratch/localdisk/
> drill/testdata/Cust_1G_20_tsv`
> > where columns[0] ='41' and columns[3] ='568'
> >
> > attached is the json profile
> > and the drillbit.log
> >
> > I also have the tracing enabled.
> > org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler
> > org.apache.drill.exec.work.foreman.Foreman
> > however i see the duration of various steps in the order of ms in the
> logs.
> > i am not sure where planning time of the order of 30 secs is consumed.
> >
> > Please help
> >
> > Regards,
> > Projjwal
> >
> >
> >
> >
> >
> >
> >
> > On Mon, Mar 6, 2017 at 11:23 PM, rahul challapalli <
> > challapallira...@gmail.com> wrote:
> >
> >> You can try the below things. For each of the below check the planning
> >> time
> >> individually
> >>
> >> 1. Run explain plan for a simple "select * from `
> >> /scratch/localdisk/drill/testdata/Cust_1G_tsv`"
> >> 2. Replace the '*' in your query with explicit column names
> >> 3. Remove the extract header from your storage plugin configuration and
> >> from your data files? Rewrite your query to use, columns[0_based_index]
> >> instead of explicit column names
> >>
> >> Also how many columns do you have in your text files and what is the
> size
> >> of each file? Like gautam suggested, it would be good to take a look at
> >> drillbit.log file (from the foreman node where planning occurred) and
> the
> >> query profile as well.
> >>
> >> - Rahul
> >>
> >> On Mon, Mar 6, 2017 at 9:30 AM, Gautam Parai <gpa...@mapr.com> wrote:
> >>
> >> > Can you please provide the drillbit.log file?
> >> >
> >> >
> >> > Gautam
> >> >
> >> > ________________________________
> >> > From: PROJJWAL SAHA <proj.s...@gmail.com>
> >> > Sent: Monday, March 6, 2017 1:45:38 AM
> >> > To: user@drill.apache.org
> >> > Subject: Fwd: Minimise query plan time for dfs plugin for local file
> >> > system on tsv file
> >> >
> >> > all, please help me in giving suggestions on what areas i can look
> into
> >> > why the query planning time is taking so long for files which are
> local
> >> to
> >> > the drill machines. I have the same directory structure copied on all
> >> the 5
> >> > nodes of the cluster. I am accessing the source files using out of
the
> >> box
> >> > dfs storage plugin.
> >> >
> >> > Query planning time is approx 30 secs
> >> > Query execution time is apprx 1.5 secs
> >> >
> >> > Regards,
> >> > Projjwal
> >> >
> >> > ---------- Forwarded message ----------
> >> > From: PROJJWAL SAHA <proj.s...@gmail.com<mailto:proj.s...@gmail.com>>
> >> > Date: Fri, Mar 3, 2017 at 5:06 PM
> >> > Subject: Minimise query plan time for dfs plugin for local file
system
> >> on
> >> > tsv file
> >> > To: user@drill.apache.org<mailto:user@drill.apache.org>
> >> >
> >> >
> >> > Hello all,
> >> >
> >> > I am quering select * from dfs.xxx where yyy (filter condition)
> >> >
> >> > I am using dfs storage plugin that comes out of the box from drill on
> a
> >> > 1GB file, local to the drill cluster.
> >> > The 1GB file is split into 10 files of 100 MB each.
> >> > As expected I see 11 minor and 2 major fagments.
> >> > The drill cluster is 5 nodes cluster with 4 cores, 32 GB each.
> >> >
> >> > One observation is that the query plan time is more than 30 seconds.
I
> >> ran
> >> > the explain plan query to validate this.
> >> > The query execution time is 2 secs.
> >> > total time taken is 32secs
> >> >
> >> > I wanted to understand how can i minimise the query plan time.
> >> Suggestions
> >> > ?
> >> > Is the time taken described above expected ?
> >> > Attached is result from explain plan query
> >> >
> >> > Regards,
> >> > Projjwal
> >> >
> >> >
> >> >
> >>
> >
> >
>
