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Posted to common-user@hadoop.apache.org by bhushan_mahale <bh...@persistent.co.in> on 2009/10/27 09:43:47 UTC
Problem to create sequence file for
Hi,
I have written a code to create sequence files for given text files.
The program takes following input parameters:
1. Local source directory - contains all the input text files
2. Destination HDFS URI - location on hdfs where sequence file will be copied
The key for a sequence-record is the file-name.
The value for a sequence-record is the content of the text file.
The program runs fine for large number input text files. But if the size of a single input text file is > 100 MB then it throws following exception:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.lang.String.toCharArray(String.java:2726)
at org.apache.hadoop.io.Text.encode(Text.java:388)
at org.apache.hadoop.io.Text.set(Text.java:178)
at org.apache.hadoop.io.Text.<init>(Text.java:81)
at SequenceFileCreator.create(SequenceFileCreator.java:106)
at SequenceFileCreator.processFile(SequenceFileCreator.java:168)
I am using "org.apache.hadoop.io.SequenceFile.Writer" for creating the sequence file. The Text class is used for keyclass and valclass.
I tried increasing the max memory for the program but it throws same error.
Can you provide your suggestions?
Thanks,
- Bhushan
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==========
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Re: Problem to create sequence file for
Posted by Jean-Eric CAZAMEA <je...@yahoo.com>.
Il y a 2 lettres inversées dans le nom
Jean-Eric
________________________________
From: Jason Venner <ja...@gmail.com>
To: common-user@hadoop.apache.org
Sent: Tue, October 27, 2009 3:54:00 PM
Subject: Re: Problem to create sequence file for
If your string is up to 300MB you will need probably 1.3+gig to write it
1 copy in the string 600MB if your file is all ascii (strings store as
shorts)
1 copy in the byte array as utf8 1 to x3 expansion, say 600MB
1 copy in the on the wire format, say 700MB
possibly
1 copy in a transit buffer on the way to the remote file system, say 720MB
that adds up to 1.9g to -> 2.6g
Hopefully there are not more copies made ;)
Try setting your heap to 3 or 5 gig with a 64bit jvm.
On Tue, Oct 27, 2009 at 9:25 AM, bhushan_mahale <
bhushan_mahale@persistent.co.in> wrote:
> Hi Jason,
>
> Thanks for the reply.
> The string is the entire content of the input text file.
> It could as long as ~300MB.
> I tried increasing jvm heap but unfortunately it was giving same error.
>
> Other option I am thinking is to split input files first.
>
> - Bhushan
> -----Original Message-----
> From: Jason Venner [mailto:jason.hadoop@gmail.com]
> Sent: Tuesday, October 27, 2009 7:19 PM
> To: common-user@hadoop.apache.org
> Subject: Re: Problem to create sequence file for
>
> How large is the string that is being written?
> Does it contain the entire contents of your file?
> You may simple need to increase the heap size with your jvm.
>
>
> On Tue, Oct 27, 2009 at 3:43 AM, bhushan_mahale <
> bhushan_mahale@persistent.co.in> wrote:
>
> > Hi,
> >
> > I have written a code to create sequence files for given text files.
> > The program takes following input parameters:
> >
> > 1. Local source directory - contains all the input text files
> > 2. Destination HDFS URI - location on hdfs where sequence file will be
> > copied
> >
> > The key for a sequence-record is the file-name.
> > The value for a sequence-record is the content of the text file.
> >
> > The program runs fine for large number input text files. But if the size
> of
> > a single input text file is > 100 MB then it throws following exception:
> >
> > Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> > at java.lang.String.toCharArray(String.java:2726)
> > at org.apache.hadoop.io.Text.encode(Text.java:388)
> > at org.apache.hadoop.io.Text.set(Text.java:178)
> > at org.apache.hadoop.io.Text.<init>(Text.java:81)
> > at SequenceFileCreator.create(SequenceFileCreator.java:106)
> > at SequenceFileCreator.processFile(SequenceFileCreator.java:168)
> >
> > I am using "org.apache.hadoop.io.SequenceFile.Writer" for creating the
> > sequence file. The Text class is used for keyclass and valclass.
> >
> > I tried increasing the max memory for the program but it throws same
> error.
> >
> > Can you provide your suggestions?
> >
> > Thanks,
> > - Bhushan
> >
> >
> > DISCLAIMER
> > ==========
> > This e-mail may contain privileged and confidential information which is
> > the property of Persistent Systems Ltd. It is intended only for the use
> of
> > the individual or entity to which it is addressed. If you are not the
> > intended recipient, you are not authorized to read, retain, copy, print,
> > distribute or use this message. If you have received this communication
> in
> > error, please notify the sender and delete all copies of this message.
> > Persistent Systems Ltd. does not accept any liability for virus infected
> > mails.
> >
>
>
>
> --
> Pro Hadoop, a book to guide you from beginner to hadoop mastery,
> http://www.amazon.com/dp/1430219424?tag=jewlerymall
> www.prohadoopbook.com a community for Hadoop Professionals
>
> DISCLAIMER
> ==========
> This e-mail may contain privileged and confidential information which is
> the property of Persistent Systems Ltd. It is intended only for the use of
> the individual or entity to which it is addressed. If you are not the
> intended recipient, you are not authorized to read, retain, copy, print,
> distribute or use this message. If you have received this communication in
> error, please notify the sender and delete all copies of this message.
> Persistent Systems Ltd. does not accept any liability for virus infected
> mails.
>
--
Pro Hadoop, a book to guide you from beginner to hadoop mastery,
http://www.amazon.com/dp/1430219424?tag=jewlerymall
www.prohadoopbook.com a community for Hadoop Professionals
Re: Problem to create sequence file for
Posted by Jason Venner <ja...@gmail.com>.
If your string is up to 300MB you will need probably 1.3+gig to write it
1 copy in the string 600MB if your file is all ascii (strings store as
shorts)
1 copy in the byte array as utf8 1 to x3 expansion, say 600MB
1 copy in the on the wire format, say 700MB
possibly
1 copy in a transit buffer on the way to the remote file system, say 720MB
that adds up to 1.9g to -> 2.6g
Hopefully there are not more copies made ;)
Try setting your heap to 3 or 5 gig with a 64bit jvm.
On Tue, Oct 27, 2009 at 9:25 AM, bhushan_mahale <
bhushan_mahale@persistent.co.in> wrote:
> Hi Jason,
>
> Thanks for the reply.
> The string is the entire content of the input text file.
> It could as long as ~300MB.
> I tried increasing jvm heap but unfortunately it was giving same error.
>
> Other option I am thinking is to split input files first.
>
> - Bhushan
> -----Original Message-----
> From: Jason Venner [mailto:jason.hadoop@gmail.com]
> Sent: Tuesday, October 27, 2009 7:19 PM
> To: common-user@hadoop.apache.org
> Subject: Re: Problem to create sequence file for
>
> How large is the string that is being written?
> Does it contain the entire contents of your file?
> You may simple need to increase the heap size with your jvm.
>
>
> On Tue, Oct 27, 2009 at 3:43 AM, bhushan_mahale <
> bhushan_mahale@persistent.co.in> wrote:
>
> > Hi,
> >
> > I have written a code to create sequence files for given text files.
> > The program takes following input parameters:
> >
> > 1. Local source directory - contains all the input text files
> > 2. Destination HDFS URI - location on hdfs where sequence file will be
> > copied
> >
> > The key for a sequence-record is the file-name.
> > The value for a sequence-record is the content of the text file.
> >
> > The program runs fine for large number input text files. But if the size
> of
> > a single input text file is > 100 MB then it throws following exception:
> >
> > Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> > at java.lang.String.toCharArray(String.java:2726)
> > at org.apache.hadoop.io.Text.encode(Text.java:388)
> > at org.apache.hadoop.io.Text.set(Text.java:178)
> > at org.apache.hadoop.io.Text.<init>(Text.java:81)
> > at SequenceFileCreator.create(SequenceFileCreator.java:106)
> > at SequenceFileCreator.processFile(SequenceFileCreator.java:168)
> >
> > I am using "org.apache.hadoop.io.SequenceFile.Writer" for creating the
> > sequence file. The Text class is used for keyclass and valclass.
> >
> > I tried increasing the max memory for the program but it throws same
> error.
> >
> > Can you provide your suggestions?
> >
> > Thanks,
> > - Bhushan
> >
> >
> > DISCLAIMER
> > ==========
> > This e-mail may contain privileged and confidential information which is
> > the property of Persistent Systems Ltd. It is intended only for the use
> of
> > the individual or entity to which it is addressed. If you are not the
> > intended recipient, you are not authorized to read, retain, copy, print,
> > distribute or use this message. If you have received this communication
> in
> > error, please notify the sender and delete all copies of this message.
> > Persistent Systems Ltd. does not accept any liability for virus infected
> > mails.
> >
>
>
>
> --
> Pro Hadoop, a book to guide you from beginner to hadoop mastery,
> http://www.amazon.com/dp/1430219424?tag=jewlerymall
> www.prohadoopbook.com a community for Hadoop Professionals
>
> DISCLAIMER
> ==========
> This e-mail may contain privileged and confidential information which is
> the property of Persistent Systems Ltd. It is intended only for the use of
> the individual or entity to which it is addressed. If you are not the
> intended recipient, you are not authorized to read, retain, copy, print,
> distribute or use this message. If you have received this communication in
> error, please notify the sender and delete all copies of this message.
> Persistent Systems Ltd. does not accept any liability for virus infected
> mails.
>
--
Pro Hadoop, a book to guide you from beginner to hadoop mastery,
http://www.amazon.com/dp/1430219424?tag=jewlerymall
www.prohadoopbook.com a community for Hadoop Professionals
Re: Problem to create sequence file for
Posted by Amogh Vasekar <am...@yahoo-inc.com>.
Hi Bhushan,
If splitting input files is an option, why don't you let hadoop do this for you? If need be you may use a custom input format and sequencefile*outputformat.
Amogh
On 10/27/09 7:55 PM, "bhushan_mahale" <bh...@persistent.co.in> wrote:
Hi Jason,
Thanks for the reply.
The string is the entire content of the input text file.
It could as long as ~300MB.
I tried increasing jvm heap but unfortunately it was giving same error.
Other option I am thinking is to split input files first.
- Bhushan
-----Original Message-----
From: Jason Venner [mailto:jason.hadoop@gmail.com]
Sent: Tuesday, October 27, 2009 7:19 PM
To: common-user@hadoop.apache.org
Subject: Re: Problem to create sequence file for
How large is the string that is being written?
Does it contain the entire contents of your file?
You may simple need to increase the heap size with your jvm.
On Tue, Oct 27, 2009 at 3:43 AM, bhushan_mahale <
bhushan_mahale@persistent.co.in> wrote:
> Hi,
>
> I have written a code to create sequence files for given text files.
> The program takes following input parameters:
>
> 1. Local source directory - contains all the input text files
> 2. Destination HDFS URI - location on hdfs where sequence file will be
> copied
>
> The key for a sequence-record is the file-name.
> The value for a sequence-record is the content of the text file.
>
> The program runs fine for large number input text files. But if the size of
> a single input text file is > 100 MB then it throws following exception:
>
> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> at java.lang.String.toCharArray(String.java:2726)
> at org.apache.hadoop.io.Text.encode(Text.java:388)
> at org.apache.hadoop.io.Text.set(Text.java:178)
> at org.apache.hadoop.io.Text.<init>(Text.java:81)
> at SequenceFileCreator.create(SequenceFileCreator.java:106)
> at SequenceFileCreator.processFile(SequenceFileCreator.java:168)
>
> I am using "org.apache.hadoop.io.SequenceFile.Writer" for creating the
> sequence file. The Text class is used for keyclass and valclass.
>
> I tried increasing the max memory for the program but it throws same error.
>
> Can you provide your suggestions?
>
> Thanks,
> - Bhushan
>
>
> DISCLAIMER
> ==========
> This e-mail may contain privileged and confidential information which is
> the property of Persistent Systems Ltd. It is intended only for the use of
> the individual or entity to which it is addressed. If you are not the
> intended recipient, you are not authorized to read, retain, copy, print,
> distribute or use this message. If you have received this communication in
> error, please notify the sender and delete all copies of this message.
> Persistent Systems Ltd. does not accept any liability for virus infected
> mails.
>
--
Pro Hadoop, a book to guide you from beginner to hadoop mastery,
http://www.amazon.com/dp/1430219424?tag=jewlerymall
www.prohadoopbook.com a community for Hadoop Professionals
DISCLAIMER
==========
This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails.
RE: Problem to create sequence file for
Posted by bhushan_mahale <bh...@persistent.co.in>.
Hi Jason,
Thanks for the reply.
The string is the entire content of the input text file.
It could as long as ~300MB.
I tried increasing jvm heap but unfortunately it was giving same error.
Other option I am thinking is to split input files first.
- Bhushan
-----Original Message-----
From: Jason Venner [mailto:jason.hadoop@gmail.com]
Sent: Tuesday, October 27, 2009 7:19 PM
To: common-user@hadoop.apache.org
Subject: Re: Problem to create sequence file for
How large is the string that is being written?
Does it contain the entire contents of your file?
You may simple need to increase the heap size with your jvm.
On Tue, Oct 27, 2009 at 3:43 AM, bhushan_mahale <
bhushan_mahale@persistent.co.in> wrote:
> Hi,
>
> I have written a code to create sequence files for given text files.
> The program takes following input parameters:
>
> 1. Local source directory - contains all the input text files
> 2. Destination HDFS URI - location on hdfs where sequence file will be
> copied
>
> The key for a sequence-record is the file-name.
> The value for a sequence-record is the content of the text file.
>
> The program runs fine for large number input text files. But if the size of
> a single input text file is > 100 MB then it throws following exception:
>
> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> at java.lang.String.toCharArray(String.java:2726)
> at org.apache.hadoop.io.Text.encode(Text.java:388)
> at org.apache.hadoop.io.Text.set(Text.java:178)
> at org.apache.hadoop.io.Text.<init>(Text.java:81)
> at SequenceFileCreator.create(SequenceFileCreator.java:106)
> at SequenceFileCreator.processFile(SequenceFileCreator.java:168)
>
> I am using "org.apache.hadoop.io.SequenceFile.Writer" for creating the
> sequence file. The Text class is used for keyclass and valclass.
>
> I tried increasing the max memory for the program but it throws same error.
>
> Can you provide your suggestions?
>
> Thanks,
> - Bhushan
>
>
> DISCLAIMER
> ==========
> This e-mail may contain privileged and confidential information which is
> the property of Persistent Systems Ltd. It is intended only for the use of
> the individual or entity to which it is addressed. If you are not the
> intended recipient, you are not authorized to read, retain, copy, print,
> distribute or use this message. If you have received this communication in
> error, please notify the sender and delete all copies of this message.
> Persistent Systems Ltd. does not accept any liability for virus infected
> mails.
>
--
Pro Hadoop, a book to guide you from beginner to hadoop mastery,
http://www.amazon.com/dp/1430219424?tag=jewlerymall
www.prohadoopbook.com a community for Hadoop Professionals
DISCLAIMER
==========
This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails.
Re: Problem to create sequence file for
Posted by Jason Venner <ja...@gmail.com>.
How large is the string that is being written?
Does it contain the entire contents of your file?
You may simple need to increase the heap size with your jvm.
On Tue, Oct 27, 2009 at 3:43 AM, bhushan_mahale <
bhushan_mahale@persistent.co.in> wrote:
> Hi,
>
> I have written a code to create sequence files for given text files.
> The program takes following input parameters:
>
> 1. Local source directory - contains all the input text files
> 2. Destination HDFS URI - location on hdfs where sequence file will be
> copied
>
> The key for a sequence-record is the file-name.
> The value for a sequence-record is the content of the text file.
>
> The program runs fine for large number input text files. But if the size of
> a single input text file is > 100 MB then it throws following exception:
>
> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> at java.lang.String.toCharArray(String.java:2726)
> at org.apache.hadoop.io.Text.encode(Text.java:388)
> at org.apache.hadoop.io.Text.set(Text.java:178)
> at org.apache.hadoop.io.Text.<init>(Text.java:81)
> at SequenceFileCreator.create(SequenceFileCreator.java:106)
> at SequenceFileCreator.processFile(SequenceFileCreator.java:168)
>
> I am using "org.apache.hadoop.io.SequenceFile.Writer" for creating the
> sequence file. The Text class is used for keyclass and valclass.
>
> I tried increasing the max memory for the program but it throws same error.
>
> Can you provide your suggestions?
>
> Thanks,
> - Bhushan
>
>
> DISCLAIMER
> ==========
> This e-mail may contain privileged and confidential information which is
> the property of Persistent Systems Ltd. It is intended only for the use of
> the individual or entity to which it is addressed. If you are not the
> intended recipient, you are not authorized to read, retain, copy, print,
> distribute or use this message. If you have received this communication in
> error, please notify the sender and delete all copies of this message.
> Persistent Systems Ltd. does not accept any liability for virus infected
> mails.
>
--
Pro Hadoop, a book to guide you from beginner to hadoop mastery,
http://www.amazon.com/dp/1430219424?tag=jewlerymall
www.prohadoopbook.com a community for Hadoop Professionals