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From Jon Haddad <>
Subject Re: Cassandra vs Elasticsearch.
Date Sat, 03 May 2014 08:03:32 GMT
Agreed w/ ES not being the durable data store.  I would recommend treating it as ephemeral,
and using Cassandra as your source of truth.  Keep in mind if you change your ES index mapping,
you’ll require a full reindex in order to search the data properly.  It’s not like adding
a secondary index w/ a DB, where it’ll go back and take care of it for you.


On May 3, 2014, at 12:31 AM, DuyHai Doan <> wrote:

> Hello Tim
>  You're absolutely right about ES for the query part. This is the perfect fit for complex
queries. Now regarding your question:
> "What advantages does Cassandra give me over ES?" --> linear scalability & durability.
ES is just a super index cluster. I've talked to ES guys. If they do not sell ES right now
as a "database for complex search" it's because there is no strong guarantee about durability
for your data. Many people just live with it and it's fine. Also, if you store the original
data and just pump it into ES it's also fine.
> On Sat, May 3, 2014 at 9:14 AM, Tim Uckun <> wrote:
> Hey all.
> I have been trying out some data stores for time series data and Cassandra was the first
on my list because so many people are using it for the same purpose.  I have read many articles
on how to model my time series data and tried several variations of schemas which I thought
made sense for my data but I have really struggled to run some complex queries I need to run.
 This has led me down a kind of a rabbit hole of trying to create various "materialized views"
and shotgunning the data into multiple tables which might be able to run my queries.
> In the mean time I also took the same data and pumped it into Elasticsearch and was able
to run almost all the queries I needed without doing anything fancy. Just put the data in,
and run your query. The new aggregations in ES are pretty slick although they don't seem to
be 100% accurate compared to running the same query in Postgres.
> My question is this.  What advantages does Cassandra give me over ES?  Does it compact
the data better? Is it faster to query once your data sizes are huge? Does it use less bandwidth?
Is it easier to administer? 
> I know there must be very compelling reasons to use C* because so many companies are
depending on it for their bread and butter so I'd love to hear your take.
> Thanks.

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