cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Marcus Eriksson (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-13215) Cassandra nodes startup time 20x more after upgarding to 3.x
Date Wed, 11 Oct 2017 12:38:00 GMT


Marcus Eriksson commented on CASSANDRA-13215:

so finally got around to finishing this up, I still need to write a bunch of tests, but if
anyone has a safe place to try it out, please do

> Cassandra nodes startup time 20x more after upgarding to 3.x
> ------------------------------------------------------------
>                 Key: CASSANDRA-13215
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>         Environment: Cluster setup: two datacenters (dc-main, dc-backup).
> dc-main - 9 servers, no vnodes
> dc-backup - 6 servers, vnodes
>            Reporter: Viktor Kuzmin
>            Assignee: Marcus Eriksson
>         Attachments: simple-cache.patch
> CompactionStrategyManage.getCompactionStrategyIndex is called on each sstable at startup.
And this function calls StorageService.getDiskBoundaries. And getDiskBoundaries calls AbstractReplicationStrategy.getAddressRanges.
> It appears that last function can be really slow. In our environment we have 1545 tokens
and with NetworkTopologyStrategy it can make 1545*1545 computations in worst case (maybe I'm
wrong, but it really takes lot's of cpu).
> Also this function can affect runtime later, cause it is called not only during startup.
> I've tried to implement simple cache for getDiskBoundaries results and now startup time
is about one minute instead of 25m, but I'm not sure if it's a good solution.

This message was sent by Atlassian JIRA

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message