Migrating from MongoDB to HBase - mongodb

Question

Hi I am very new to HBase database. I downloaded some twitter data and stored into MongoDB. Now I need to transform that data into HBase to speed-up Hadoop processing. But I am not able to create it's scheme. Here I have twitter data into JSON format-
{
"_id" : ObjectId("512b71e6e4b02a4322d1c0b0"),
"id" : NumberLong("306044618179506176"),
"source" : "Facebook",
"user" : {
"name" : "Dada Bhagwan",
"location" : "India",
"url" : "http://www.dadabhagwan.org",
"id" : 191724440,
"protected" : false,
"timeZone" : null,
"description" : "Founder of Akram Vignan - Practical Spiritual Science of Self Realization",
"screenName" : "dadabhagwan",
"geoEnabled" : false,
"profileImageURL" : "http://a0.twimg.com/profile_images/1647956820/M_DSC_0034_normal.jpg",
"biggerProfileImageURL" : "http://a0.twimg.com/profile_images/1647956820/M_DSC_0034_bigger.jpg",
"profileImageUrlHttps" : "https://si0.twimg.com/profile_images/1647956820/M_DSC_0034_normal.jpg",
"profileImageURLHttps" : "https://si0.twimg.com/profile_images/1647956820/M_DSC_0034_normal.jpg",
"biggerProfileImageURLHttps" : "https://si0.twimg.com/profile_images/1647956820/M_DSC_0034_bigger.jpg",
"miniProfileImageURLHttps" : "https://si0.twimg.com/profile_images/1647956820/M_DSC_0034_mini.jpg",
"originalProfileImageURLHttps" : "https://si0.twimg.com/profile_images/1647956820/M_DSC_0034.jpg",
"followersCount" : 499,
"profileBackgroundColor" : "EEE4C1",
"profileTextColor" : "333333",
"profileLinkColor" : "990000",
"lang" : "en",
"profileSidebarFillColor" : "FCF9EC",
"profileSidebarBorderColor" : "CBC09A",
"profileUseBackgroundImage" : true,
"showAllInlineMedia" : false,
"friendsCount" : 1,
"favouritesCount" : 0,
"profileBackgroundImageUrl" : "http://a0.twimg.com/profile_background_images/396759326/dadabhagwan-twitter.jpg",
"profileBackgroundImageURL" : "http://a0.twimg.com/profile_background_images/396759326/dadabhagwan-twitter.jpg",
"profileBackgroundImageUrlHttps" : "https://si0.twimg.com/profile_background_images/396759326/dadabhagwan-twitter.jpg",
"profileBannerURL" : null,
"profileBannerRetinaURL" : null,
"profileBannerIPadURL" : null,
"profileBannerIPadRetinaURL" : null,
"miniProfileImageURL" : "http://a0.twimg.com/profile_images/1647956820/M_DSC_0034_mini.jpg",
"originalProfileImageURL" : "http://a0.twimg.com/profile_images/1647956820/M_DSC_0034.jpg",
"utcOffset" : -1,
"contributorsEnabled" : false,
"status" : null,
"createdAt" : NumberLong("1284700143000"),
"profileBannerMobileURL" : null,
"profileBannerMobileRetinaURL" : null,
"profileBackgroundTiled" : false,
"statusesCount" : 1713,
"verified" : false,
"translator" : false,
"listedCount" : 6,
"followRequestSent" : false,
"descriptionURLEntities" : [ ],
"urlentity" : {
"url" : "http://www.dadabhagwan.org",
"start" : 0,
"end" : 26,
"expandedURL" : "http://www.dadabhagwan.org",
"displayURL" : "http://www.dadabhagwan.org"
},
"rateLimitStatus" : null,
"accessLevel" : 0
},
"contributors" : [ ],
"geoLocation" : null,
"place" : null,
"favorited" : false,
"retweet" : false,
"retweetedStatus" : null,
"retweetCount" : 0,
"userMentionEntities" : [ ],
"retweetedByMe" : false,
"currentUserRetweetId" : -1,
"possiblySensitive" : false,
"urlentities" : [
{
"url" : "http://t.co/gR1GohGjaj",
"start" : 113,
"end" : 135,
"expandedURL" : "http://fb.me/2j2HKHJrM",
"displayURL" : "fb.me/2j2HKHJrM"
}
],
"hashtagEntities" : [ ],
"mediaEntities" : [ ],
"truncated" : false,
"inReplyToStatusId" : -1,
"text" : "Spiritual Quote of the Day :\n\n‘I am Chandubhai’ is an illusion itself and from that are \nkarmas charged. When... http://t.co/gR1GohGjaj",
"inReplyToUserId" : -1,
"inReplyToScreenName" : null,
"createdAt" : NumberLong("1361801697000"),
"rateLimitStatus" : null,
"accessLevel" : 0
}
Here how to divide data into columns and column-family? I thought to make one "twitter" column-family that contain source, getlocation, place, retweet etc... and another "user" column-family and that contain name, location etc... (user's data). i.e new column family for each inner level sub-document.
Is this approach is correct? Now How I will differentiate urlentity for "user" column-family and "twitter" column-family?
And how to handle those keys that contain list of sub-documents (for e.g. urlentity)

Answer 1

There are many ways to model this in HBase ranging from storing everything in a single column to having a different table for each sub entity with several other tables for "indexing".
Generally speaking you model the data in hbase based on you read and write access patterns. fo r example column family are stored in different files on disk. A reason to divide data into two column families is if there are a lot of cases where you need data from one and not the other. etc.
There's a good presentation about HBAse schema design by Ian Varley from HBaseCon 2012 you can find the slides here and the video here