You are viewing a plain text version of this content. The canonical link for it is here.
Posted to mapreduce-user@hadoop.apache.org by Claudio Martella <cl...@tis.bz.it> on 2011/11/07 15:48:49 UTC
Map-only output compression
Hello list,
I have a map-only job and I'd like to compress the output (possibly
avoiding a re-compression when the map-output gets promoted as final
output).
I can see 4 ways of obtaining it:
1) by defining map to compress through mapred.compress.map.output.*
2) by defining output to compress through mapred.output.compression.*
3) by defining the TextOutputFormat to compress through
TextOutputFormat.setCompressOutput()
4) by composing one or more of the first 3 possibilities
Any insight about how to do this properly? I'm running hadoop 0.20.204.0
--
Claudio Martella
Free Software & Open Technologies
Analyst
TIS innovation park
Via Siemens 19 | Siemensstr. 19
39100 Bolzano | 39100 Bozen
Tel. +39 0471 068 123
Fax +39 0471 068 129
claudio.martella@tis.bz.it http://www.tis.bz.it
Short information regarding use of personal data. According to Section 13 of Italian Legislative Decree no. 196 of 30 June 2003, we inform you that we process your personal data in order to fulfil contractual and fiscal obligations and also to send you information regarding our services and events. Your personal data are processed with and without electronic means and by respecting data subjects' rights, fundamental freedoms and dignity, particularly with regard to confidentiality, personal identity and the right to personal data protection. At any time and without formalities you can write an e-mail to privacy@tis.bz.it in order to object the processing of your personal data for the purpose of sending advertising materials and also to exercise the right to access personal data and other rights referred to in Section 7 of Decree 196/2003. The data controller is TIS Techno Innovation Alto Adige, Siemens Street n. 19, Bolzano. You can find the complete information on the web site www.tis.bz.it.
Re: Map-only output compression
Posted by Claudio Martella <cl...@tis.bz.it>.
Thanks!
On Mon Nov 7 15:57:01 2011, Joey Echeverria wrote:
> You want option 3.
>
> Option 1 is only used to compress intermediate output, it doesn't
> apply to map only jobs.
> Option 2 only enables compression for SequenceFileOutputFormat. If
> you're not using that output format, it won't help.
>
> -Joey
>
> On Monday, November 7, 2011, Claudio Martella wrote:
>
> Hello list,
>
> I have a map-only job and I'd like to compress the output (possibly
> avoiding a re-compression when the map-output gets promoted as final
> output).
> I can see 4 ways of obtaining it:
>
> 1) by defining map to compress through mapred.compress.map.output.*
> 2) by defining output to compress through mapred.output.compression.*
> 3) by defining the TextOutputFormat to compress through
> TextOutputFormat.setCompressOutput()
> 4) by composing one or more of the first 3 possibilities
>
> Any insight about how to do this properly? I'm running hadoop
> 0.20.204.0
>
>
> --
> Claudio Martella
> Free Software & Open Technologies
> Analyst
>
> TIS innovation park
> Via Siemens 19 | Siemensstr. 19
> 39100 Bolzano | 39100 Bozen
> Tel. +39 0471 068 123
> Fax +39 0471 068 129
> claudio.martella@tis.bz.it <javascript:;> http://www.tis.bz.it
>
> Short information regarding use of personal data. According to
> Section 13 of Italian Legislative Decree no. 196 of 30 June 2003,
> we inform you that we process your personal data in order to
> fulfil contractual and fiscal obligations and also to send you
> information regarding our services and events. Your personal data
> are processed with and without electronic means and by respecting
> data subjects' rights, fundamental freedoms and dignity,
> particularly with regard to confidentiality, personal identity and
> the right to personal data protection. At any time and without
> formalities you can write an e-mail to privacy@tis.bz.it
> <javascript:;> in order to object the processing of your personal
> data for the purpose of sending advertising materials and also to
> exercise the right to access personal data and other rights
> referred to in Section 7 of Decree 196/2003. The data controller
> is TIS Techno Innovation Alto Adige, Siemens Street n. 19,
> Bolzano. You can find the complete information on the web site
> www.tis.bz.it <http://www.tis.bz.it>.
>
>
>
>
>
>
> --
> Joseph Echeverria
> Cloudera, Inc.
> 443.305.9434
>
--
--
Claudio Martella
Free Software & Open Technologies
Analyst
TIS innovation park
Via Siemens 19 | Siemensstr. 19
39100 Bolzano | 39100 Bozen
Tel. +39 0471 068 123
Fax +39 0471 068 129
claudio.martella@tis.bz.it http://www.tis.bz.it
Short information regarding use of personal data. According to Section
13 of Italian Legislative Decree no. 196 of 30 June 2003, we inform you
that we process your personal data in order to fulfil contractual and
fiscal obligations and also to send you information regarding our
services and events. Your personal data are processed with and without
electronic means and by respecting data subjects' rights, fundamental
freedoms and dignity, particularly with regard to confidentiality,
personal identity and the right to personal data protection. At any
time and without formalities you can write an e-mail to
privacy@tis.bz.it in order to object the processing of your personal
data for the purpose of sending advertising materials and also to
exercise the right to access personal data and other rights referred to
in Section 7 of Decree 196/2003. The data controller is TIS Techno
Innovation Alto Adige, Siemens Street n. 19, Bolzano. You can find the
complete information on the web site www.tis.bz.it.
Re: Map-only output compression
Posted by Joey Echeverria <jo...@cloudera.com>.
You want option 3.
Option 1 is only used to compress intermediate output, it doesn't apply to
map only jobs.
Option 2 only enables compression for SequenceFileOutputFormat. If you're
not using that output format, it won't help.
-Joey
On Monday, November 7, 2011, Claudio Martella wrote:
> Hello list,
>
> I have a map-only job and I'd like to compress the output (possibly
> avoiding a re-compression when the map-output gets promoted as final
> output).
> I can see 4 ways of obtaining it:
>
> 1) by defining map to compress through mapred.compress.map.output.*
> 2) by defining output to compress through mapred.output.compression.*
> 3) by defining the TextOutputFormat to compress through
> TextOutputFormat.setCompressOutput()
> 4) by composing one or more of the first 3 possibilities
>
> Any insight about how to do this properly? I'm running hadoop 0.20.204.0
>
>
> --
> Claudio Martella
> Free Software & Open Technologies
> Analyst
>
> TIS innovation park
> Via Siemens 19 | Siemensstr. 19
> 39100 Bolzano | 39100 Bozen
> Tel. +39 0471 068 123
> Fax +39 0471 068 129
> claudio.martella@tis.bz.it <javascript:;> http://www.tis.bz.it
>
> Short information regarding use of personal data. According to Section 13
> of Italian Legislative Decree no. 196 of 30 June 2003, we inform you that
> we process your personal data in order to fulfil contractual and fiscal
> obligations and also to send you information regarding our services and
> events. Your personal data are processed with and without electronic means
> and by respecting data subjects' rights, fundamental freedoms and dignity,
> particularly with regard to confidentiality, personal identity and the
> right to personal data protection. At any time and without formalities you
> can write an e-mail to privacy@tis.bz.it <javascript:;> in order to
> object the processing of your personal data for the purpose of sending
> advertising materials and also to exercise the right to access personal
> data and other rights referred to in Section 7 of Decree 196/2003. The data
> controller is TIS Techno Innovation Alto Adige, Siemens Street n. 19,
> Bolzano. You can find the complete information on the web site
> www.tis.bz.it.
>
>
>
>
>
--
Joseph Echeverria
Cloudera, Inc.
443.305.9434