SSTables are immutable - once they're written to disk, they cannot be
changed.
On read C* checks *all* SSTables [1], but to make it faster, it uses
Bloom Filters, that can tell you if a row is *not* in a specific
SSTable, so you don't have to read it at all. However, *if* you read it
in case
@Michal : look a this for the improvement of read performance :
https://issues.apache.org/jira/browse/CASSANDRA-2498
Best regards.
Jean Armel
2013/7/18 Michał Michalski mich...@opera.com
SSTables are immutable - once they're written to disk, they cannot be
changed.
On read C* checks *all*
Thanks! :-)
M.
W dniu 18.07.2013 08:42, Jean-Armel Luce pisze:
@Michal : look a this for the improvement of read performance :
https://issues.apache.org/jira/browse/CASSANDRA-2498
Best regards.
Jean Armel
2013/7/18 Michał Michalski mich...@opera.com
SSTables are immutable - once they're
This webinar I did a few months ago goes through the read and write path
http://www.youtube.com/watch?v=zFCjekgK7ZY
I get to that about 29 minutes in.
slides
http://www.slideshare.net/aaronmorton/cassandra-community-webinar-introduction-to-apache-cassandra-12-20353118
Cheers
Since SSTables are mutable, and they are ordered, does this mean that there
is a index of key ranges that each SS table holds, and the value could be 1
more sstables that have to be scanned and then the latest one is chosen?
e.g. Say I write a value abc to CF1. This gets stored in a sstable.
Since SSTables are mutable, and they are ordered, does this mean that there
is a index of key ranges that each SS table holds, and the value could be 1
more sstables that have to be scanned and then the latest one is chosen?
e.g. Say I write a value abc to CF1. This gets stored in a sstable.
Yes..Multiple SSTables can have same key and only after compaction the keys are
merged reflect the latest value..
From: S Ahmed [mailto:sahmed1...@gmail.com]
Sent: 17 July 2013 15:54
To: cassandra-u...@incubator.apache.org
Subject: is there a key to sstable index file?
Since SSTables
On Wed, Jul 17, 2013 at 1:53 PM, S Ahmed sahmed1...@gmail.com wrote:
So is there an index of key's to sstables, and there can be 1 or more
sstables per key?
There are bloom filters, which answer the question is my row key
definitely not in this SSTable?
There is also the Key Cache, which is
