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From Mohammed Guller <>
Subject RE: Spark performance
Date Mon, 13 Jul 2015 18:38:57 GMT
Good points, Michael.

The underlying assumption in my statement is that cost is an issue. If cost is not an issue
and the only requirement is to query structured data, then there are several databases such
as Teradata, Exadata, and Vertica that can handle 4-6 TB of data and outperform Spark.


From: Michael Segel []
Sent: Sunday, July 12, 2015 6:59 AM
To: Mohammed Guller
Cc: David Mitchell; Roman Sokolov; user; Ravisankar Mani
Subject: Re: Spark performance

Not necessarily.

It depends on the use case and what you intend to do with the data.

4-6 TB will easily fit on an SMP box and can be efficiently searched by an RDBMS.
Again it depends on what you want to do and how you want to do it.

Informix’s IDS engine with its extensibility could still outperform spark in some use cases
based on the proper use of indexes and amount of parallelism.

There is a lot of cross over… now had you said 100TB+ on unstructured data… things may
be different.

Please understand that what would make spark more compelling is the TCO of the solution when
compared to SMP boxes and software licensing.

Its not that I don’t disagree with your statements, because moving from mssql or any small
RDBMS to spark … doesn’t make a whole lot of sense.
Just wanted to add that the decision isn’t as cut and dry as some think….

On Jul 11, 2015, at 8:47 AM, Mohammed Guller <<>>

Hi Roman,
Yes, Spark SQL will be a better solution than standard RDBMS databases for querying 4-6 TB
data. You can pair Spark SQL with HDFS+Parquet to build a powerful analytics solution.


From: David Mitchell []
Sent: Saturday, July 11, 2015 7:10 AM
To: Roman Sokolov
Cc: Mohammed Guller; user; Ravisankar Mani
Subject: Re: Spark performance

You can certainly query over 4 TB of data with Spark.  However, you will get an answer in
minutes or hours, not in milliseconds or seconds.  OLTP databases are used for web applications,
and typically return responses in milliseconds.  Analytic databases tend to operate on large
data sets, and return responses in seconds, minutes or hours.  When running batch jobs over
large data sets, Spark can be a replacement for analytic databases like Greenplum or Netezza.

On Sat, Jul 11, 2015 at 8:53 AM, Roman Sokolov <<>>
Hello. Had the same question. What if I need to store 4-6 Tb and do queries? Can't find any
clue in documentation.
Am 11.07.2015 03:28 schrieb "Mohammed Guller" <<>>:
Hi Ravi,
First, Neither Spark nor Spark SQL is a database. Both are compute engines, which need to
be paired with a storage system. Seconds, they are designed for processing large distributed
datasets. If you have only 100,000 records or even a million records, you don’t need Spark.
A RDBMS will perform much better for that volume of data.


From: Ravisankar Mani [<>]
Sent: Friday, July 10, 2015 3:50 AM
Subject: Spark performance

Hi everyone,
I have planned to move mssql server to spark?.  I have using around 50,000 to 1l records.
 The spark performance is slow when compared to mssql server.

What is the best data base(Spark or sql) to store or retrieve data around 50,000 to 1l records

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