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From Mario Micklisch <>
Subject a few generic questions
Date Sat, 18 Sep 2010 20:12:56 GMT
Hi there,

I am currently in the planning state of a new web application that should
use Cassandra because of its scaling possibilities.

I would like to ask a few questions to make sure I fully understood how
Cassandra handles certain cases. If there is somewhere I missed to read or
where some more details are available, please point me in that direction :-)

Removal of data:
If I delete delete data from my cluster will there over time be nodes that
will have more/less data than the average node?
Will it lead to an imbalanced distribution of data or will Cassandra move
some data between nodes to keep them evenly used?


If I have a small portion of data that is read very often which is
unfortunately on the same node.
Will this lead to an unbalanced Server-Load or will Cassandra distribute
data also based on how often it it accessed?

There is this comment on the auto_bootstap documentation:
(If no InitialToken is specified, they will pick one such that they will get
half the range of the most-loaded node.)

Does this mean the CPU Load or data load/storage?


Node down:
If I have a node that went down and took all its data with it.
Will a new node with auto_bootstrap true will replace it or do I need to
specify the token of the lost node?

Thank you in advance for your help,

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