Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Hadoop streaming is advantageous for those cases when the developer do not have the much knowhow of Java and can write Mapper/Reducer in any scripting language faster.</p> <p>When compared to custom jar jobs, a streaming Job would also have the additional overhead of starting a scripting(Python/Ruby/Perl) VM. This leads to a lot of inter-process communication, resulting in reduced efficiency of the jobs in most of the cases. </p> <p>Using Hadoop streaming brings with it restrictions on the input/output formats. There are times when you would like to create custom input/output formats, using custom jars would be the natural choice. Also using Java one can over-ride/extend many of hadoop's functionalities to one's need/choice.</p> <p>Quoting from an answer <a href="https://stackoverflow.com/questions/9569009/what-are-the-pros-and-cons-of-running-a-job-in-hadoop-using-various-languages">here</a>:</p> <blockquote> <p>Hadoop do has capability to work with MR jobs created in other languages - it is called streaming. This model only allow us to define mapper and reducer with some restrictions not present in java. In the same time - input/output formats and other plugins do have to be written as java classes So I would define decision making as following: </p> <ul> <li>Use Java, unless you have serious codebase you need to resue in Your MR job. </li> <li>Consider to use python when you need to create some simple ad hoc jobs.</li> </ul> </blockquote> <p>As for streaming only available for <code>mapred</code> API, it doesn't make sense. While using streaming mappers/reducers are written in another languages, so no point worrying about which API hadoop internally will use in order to execute them.</p>
    singulars
    1. This table or related slice is empty.
    1. POHadoop Streaming job vs regular jobs?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USAmar
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COwhere could i find more details. Some links would be helpful
      singulars
      1. PO
      1. USTom Sebastian
    2. COconsider using google, it is a great website, here you have the first hit if you type hadoop streaming: http://hadoop.apache.org/docs/r1.1.2/streaming.html
      singulars
      1. PO
      1. USDDW
    3. COeven this answer would help: http://stackoverflow.com/questions/6873077/streaming-or-custom-jar-in-hadoop/6889756#6889756
      singulars
      1. PO
      1. USAmar
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload