cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-981) Dynamic endpoint snitch
Date Thu, 15 Apr 2010 14:38:50 GMT
Dynamic endpoint snitch
-----------------------

                 Key: CASSANDRA-981
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-981
             Project: Cassandra
          Issue Type: New Feature
          Components: Core
            Reporter: Jonathan Ellis
             Fix For: 0.7


An endpoint snitch that automatically and dynamically infers "distance" to other machines
without having to explicitly configure rack and datacenter positions solves two problems:

The killer feature here is adapting to things like compaction or a failing-but-not-yet-dead
disk.  This is important, since when we are doing reads we pick the "closest" replica for
actually reading data from (and only read md5s from other replicas).  This means that if the
closest replica by network topology is temporarily slow due to compaction (for instance),
we'll have to block for its reply even if we get the other replies much much faster.

Not having to manually re-sync your configuration with your network topology when changes
(adding machines) are made is a nice bonus.


-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: https://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message