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Posted to user@storm.apache.org by Shivpriya Tamboskar <Sh...@symantec.com> on 2016/01/04 22:40:37 UTC

Storm-HDFS bolt file paths according to input Tuples

Hello,
  I am trying to write data into HDFS using the storm-hdfs bolt http://storm.apache.org/documentation/storm-hdfs.html

The problem I am trying to solve is that I want the file paths to be set according to the input tuples.


FileNameFormat fileNameFormat = new DefaultFileNameFormat()

        .withPath("/foo/“);


I am getting inputs from various users and what want to do is set the file paths according to the username e.g.  "/user1/“ , “/user2/“


As far as I know once the path is set for the bolt it can’t be changed unless you have file rotation policy set which is not what I want to do.


Has anyone else tried to solve this before ? Any suggestions would be appreciated.


Thanks

Shivpriya

Re: Storm-HDFS bolt file paths according to input Tuples

Posted by Shivpriya Tamboskar <Sh...@symantec.com>.

Thank you Aaron,
 I too did try to check the code to see if there is any way to modify the code and get this feature.
But it seemed too intricate. I was trying to get an idea if there are any possible solutions  the other users came up with in this situation.

-Shivpriya

From: "Aaron.Dossett" <Aa...@target.com>>
Reply-To: "user@storm.apache.org<ma...@storm.apache.org>" <us...@storm.apache.org>>
Date: Monday, January 4, 2016 at 1:49 PM
To: "user@storm.apache.org<ma...@storm.apache.org>" <us...@storm.apache.org>>
Subject: Re: Storm-HDFS bolt file paths according to input Tuples

Shivpriya,

I have thought about solving that same problem, and there is no easy answer in the current code that I could see.  You would have to modify hdfs-bolt to track a group of file handles into HDFS and define a mechanism to map a tuple to the corresponding file handle, create it if it doesn’t already exist, etc.  And you have to do it in a way that works for all of the existing flavors of hdfs-bolt (text files, sequence files, avro files).  Now hive-bolt does something conceptually similar in that in manages a connection pool, limits maximum connections, closes old connections, etc. so the pattern does exist but implementing it would be tantamount to a rewrite of hdfs-bolt.

For the problem I was trying to solve, this approach would have provided only a very small benefit, so I didn’t pursue it beyond some high level design work.  You could open a JIRA for this feature request.

Thanks, Aaron

From: Shivpriya Tamboskar <Sh...@symantec.com>>
Reply-To: "user@storm.apache.org<ma...@storm.apache.org>" <us...@storm.apache.org>>
Date: Monday, January 4, 2016 at 3:40 PM
To: "user@storm.apache.org<ma...@storm.apache.org>" <us...@storm.apache.org>>
Subject: Storm-HDFS bolt file paths according to input Tuples

Hello,
  I am trying to write data into HDFS using the storm-hdfs bolt http://storm.apache.org/documentation/storm-hdfs.html

The problem I am trying to solve is that I want the file paths to be set according to the input tuples.

FileNameFormat fileNameFormat = new DefaultFileNameFormat()

        .withPath("/foo/“);

I am getting inputs from various users and what want to do is set the file paths according to the username e.g.  "/user1/“ , “/user2/“

As far as I know once the path is set for the bolt it can’t be changed unless you have file rotation policy set which is not what I want to do.

Has anyone else tried to solve this before ? Any suggestions would be appreciated.

Thanks

Shivpriya

Re: Storm-HDFS bolt file paths according to input Tuples

Posted by "Aaron.Dossett" <Aa...@target.com>.

Shivpriya,

I have thought about solving that same problem, and there is no easy answer in the current code that I could see.  You would have to modify hdfs-bolt to track a group of file handles into HDFS and define a mechanism to map a tuple to the corresponding file handle, create it if it doesn't already exist, etc.  And you have to do it in a way that works for all of the existing flavors of hdfs-bolt (text files, sequence files, avro files).  Now hive-bolt does something conceptually similar in that in manages a connection pool, limits maximum connections, closes old connections, etc. so the pattern does exist but implementing it would be tantamount to a rewrite of hdfs-bolt.

For the problem I was trying to solve, this approach would have provided only a very small benefit, so I didn't pursue it beyond some high level design work.  You could open a JIRA for this feature request.

Thanks, Aaron

From: Shivpriya Tamboskar <Sh...@symantec.com>>
Reply-To: "user@storm.apache.org<ma...@storm.apache.org>" <us...@storm.apache.org>>
Date: Monday, January 4, 2016 at 3:40 PM
To: "user@storm.apache.org<ma...@storm.apache.org>" <us...@storm.apache.org>>
Subject: Storm-HDFS bolt file paths according to input Tuples

Hello,
  I am trying to write data into HDFS using the storm-hdfs bolt http://storm.apache.org/documentation/storm-hdfs.html

The problem I am trying to solve is that I want the file paths to be set according to the input tuples.


FileNameFormat fileNameFormat = new DefaultFileNameFormat()

        .withPath("/foo/");


I am getting inputs from various users and what want to do is set the file paths according to the username e.g.  "/user1/" , "/user2/"


As far as I know once the path is set for the bolt it can't be changed unless you have file rotation policy set which is not what I want to do.


Has anyone else tried to solve this before ? Any suggestions would be appreciated.


Thanks

Shivpriya