Databases
StackOverflow2013
Postsdbo
POcustom inputformat for reading json in hadoop
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POcustom inputformat for reading json in hadoop
    primarykey
    data
    text
    <p>i am a beginner of hadoop,i have been told to create a custom inputformat class to read json data,i have googled up and learnt how to create a custom inputformat class to read data from the file.but i am stuck on parsing the json data. my json data looks like this</p> <pre><code>[ { "_count": 30, "_start": 0, "_total": 180, "values": [ { "attachment": { "contentDomain": "techcarnival2013.eventbrite.com", "contentUrl": "http://techcarnival2013.eventbrite.com/", "imageUrl": "http://ebmedia.eventbrite.com/s3-s3/static/images/django/logos/eb_home_tm-trans-fb.png", "summary": "Get to know a few thousand of Silicon Valley's best and brightest while enjoying unparalleled access to Candlestick Park,\u00a0games, food, music and more. We'll have carnival games you haven't played since you were ten, giant inflatable obstacle...", "title": "Tech Carnival @ Candlestick Park" }, "comments": { "_total": 0 }, "creationTimestamp": 1373908436000, "creator": { "firstName": "Clayton", "headline": "Director of Operations", "secondname":{ "name":"myname" }, "lastName": "K.", "pictureUrl": "http://m.c.lnkd.licdn.com/mpr/mprx/0_R7Vm6_RqBDHaHCDzJHRA6hsNcwOfECjzMeaA6heqHeo0v6ovBWoCe8pVJiYrd5pJVu4KdbnQQ3Lj" }, "likes": { "_total": 0 }, "relationToViewer": { "availableActions": { "_total": 7, "values": [ { "code": "add-comment" }, { "code": "categorize-as-job" }, { "code": "categorize-as-promotion" }, { "code": "flag-as-inappropriate" }, { "code": "follow" }, { "code": "like" }, { "code": "reply-privately" } ] }, "isFollowing": false, "isLiked": false }, "summary": "Network with 4,000+ from the tech community, including folks from DFJ, Google, LinkedIn, Square, Uber, Y Combinator, 500 Startups, etc. $10 ticket gets you all-you-can-ride access to the pop-up Tech Carnival, will be the biggest Wednesday night of the tech summer.", "title": "Tech Event @ Candlestick Park on Wednesday, July 17th! Come play carnival games with ~4,000 of the Bay area's best and brightest!" }, { "attachment": { "contentDomain": "lifebeyondnumbers.com", "contentUrl": "http://bit.ly/10VTqMu", "imageUrl": "http://lifebeyondnumbers.com/wp-content/uploads/2013/07/lurnq_Online_Courses.jpg", "summary": "LurnQ offers a platform for learning and teaching that is free for everyone. It caters to a diverse online audience and is relevant to everyone in general. The key segment that we address now is of life long learners.", "title": "LurnQ - making lifelong learning clutter free, fun and a social..." }, "comments": { "_total": 0 }, "creationTimestamp": 1373883177000, "creator": { "firstName": "Syed", "headline": "Founder and CEO at QubiqSquare", "lastName": "Muksit", "pictureUrl": "http://m.c.lnkd.licdn.com/mpr/mprx/0_Y5gdzlRCbQBTqIa-pXYnz-01b6KinDO-pFWnz-ZCZLk1WWdt-_SLUt2uWmrpzo0OxQxcVv6pRjbE" }, "likes": { "_total": 0 }, "relationToViewer": { "availableActions": { "_total": 7, "values": [ { "code": "add-comment" }, { "code": "categorize-as-job" }, { "code": "categorize-as-promotion" }, { "code": "flag-as-inappropriate" }, { "code": "follow" }, { "code": "like" }, { "code": "reply-privately" } ] }, "isFollowing": false, "isLiked": false }, "summary": "LurnQ offers a platform for learning and teaching that is free for everyone. It caters to a diverse online audience and is relevant to everyone in general. The key segment that we address now is of life long learners.", "title": "There is so much to learn and most of the times, we don\u2019t even know that this-and-that good stuff exists. http://bit.ly/10VTqMu" }, { "attachment": { "contentDomain": "techcarnival2013.eventbrite.com", "contentUrl": "http://techcarnival2013.eventbrite.com/", "imageUrl": "http://ebmedia.eventbrite.com/s3-s3/static/images/django/logos/eb_home_tm-trans-fb.png", "summary": "Get to know a few thousand of Silicon Valley's best and brightest while enjoying unparalleled access to Candlestick Park,\u00a0games, food, music and more. We'll have carnival games you haven't played since you were ten, giant inflatable obstacle...", "title": "Tech Carnival @ Candlestick Park" }, "comments": { "_total": 0 }, "creationTimestamp": 1373654758000, "creator": { "firstName": "Clayton", "headline": "Director of Operations", "lastName": "K.", "pictureUrl": "http://m.c.lnkd.licdn.com/mpr/mprx/0_R7Vm6_RqBDHaHCDzJHRA6hsNcwOfECjzMeaA6heqHeo0v6ovBWoCe8pVJiYrd5pJVu4KdbnQQ3Lj" }, "likes": { "_total": 0 }, "relationToViewer": { "availableActions": { "_total": 7, "values": [ { "code": "add-comment" }, { "code": "categorize-as-job" }, { "code": "categorize-as-promotion" }, { "code": "flag-as-inappropriate" }, { "code": "follow" }, { "code": "like" }, { "code": "reply-privately" } ] }, "isFollowing": false, "isLiked": false }, "summary": "Network with 4,000+ from the tech community, including folks from DFJ, Google, LinkedIn, Square, Uber, Y Combinator, 500 Startups, etc. $10 ticket gets you all-you-can-ride access to the pop-up Tech Carnival, will be the biggest Wednesday night of the tech summer.", "title": "Tech Event @ Candlestick Park on Wednesday, July 17th! Come play carnival games with ~4,000 of the Bay area's best and brightest!" } .......... ........ so on ] </code></pre> <p>so im in a confusion how to read the json object in my custom inputformat class.any ideas on how to parse this?i want to read individual json object inside the json array,i mean read the proper json string and then give the string to map where i would use a json parser inside the map to construct my own key value pair.any help on this?thanks in advance</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USjkovacs
    1. USuser1585111
    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. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POcustom inputformat for reading json in hadoop
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    2. VO
      singulars
      1. POcustom inputformat for reading json in hadoop
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIs a json object in one single line or does it take up multiple lines? If a single line, have a look at https://github.com/alexholmes/hadoop-book/blob/master/src/main/java/com/manning/hip/ch3/json/JsonInputFormat.java
      singulars
      1. POcustom inputformat for reading json in hadoop
      1. USMagham Ravi
    2. COSo, what I understood is you are able to get the full JSON data inside the mappers but couldn't parse it?
      singulars
      1. POcustom inputformat for reading json in hadoop
      1. USSSaikia_JtheRocker
    3. CO@Magham Ravi it takes up multiple lines
      singulars
      1. POcustom inputformat for reading json in hadoop
      1. USuser1585111
 

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