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From <>
Subject RE: Manual Indexing With Buckets
Date Fri, 24 Jul 2015 12:09:35 GMT
It is a bit hard to follow. Perhaps you could include your proposed schema (annotated with
your size predictions) to spur more discussion. To me, it sounds a bit convoluted. Why is
a "batch" so big (up to 100 million rows)? Is a row in the primary only associated with one

Sean Durity - Cassandra Admin, Big Data Team
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From: Anuj Wadehra []
Sent: Friday, July 24, 2015 3:57 AM
Subject: Re: Manual Indexing With Buckets

Can anyone take this one?


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From:"Anuj Wadehra" <<>>
Date:Thu, 23 Jul, 2015 at 10:57 pm
Subject:Manual Indexing With Buckets
We have a primary table and we need search capability by batchid column. So we are creating
a manual index for search by batch id. We are using buckets to restrict a row size in batch
id index table to 50mb. As batch size may vary drastically ( ie one batch id may be associated
to 100k row keys in primary table while other may be associated with 100million row keys),
we are creating a metadata table to track the approximate data while insertions for a batch
in primary table, so that batch id index table has dynamic no of buckets/rows. As more data
is inserted for a batch in primary table, new set of 10 buckets are added. At any point in
time, clients will write to latest 10 buckets created for a batch od index in round robin
 to avoid hotspots.

Comments required on the following:
1. I want to know any suggestios on above design?

2. Whats the best approach for updating/deleting from index table. When a row is manually
purged from primary table, we dont know where that row key exists in x number of buckets created
for its batch id?


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