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Posted to commits@cassandra.apache.org by "Jacek Lewandowski (JIRA)" <ji...@apache.org> on 2013/09/03 13:16:52 UTC
[jira] [Updated] (CASSANDRA-5972) Reduce the amount of data to be
transferred during repair
[ https://issues.apache.org/jira/browse/CASSANDRA-5972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jacek Lewandowski updated CASSANDRA-5972:
-----------------------------------------
Description:
Currently, when a validator finds a token range different in n replicas, data streams are initiated simultaneously between each possible pair of these n nodes, in both directions. It yields n*(n-1) data stream in total.
It can be done in a sequence - Replica[1] -> R[2], R[2] -> R[3], ... , R[n-1] -> R[n]. After this process, the data in R[n] are up to date. Then, we continue: R[n] -> R[1], R[1] -> R[2], ... , R[n-2] -> R[n-1]. The active repair is done after 2*(n-1) data transfers performed sequentially in 2*(n-1) steps.
was:
Currently, when a validator finds a token range different in n replicas, data streams are initiated simultaneously between each possible pair of these n nodes, in both directions. It yields n*(n-1) data stream in total.
It can be done in a sequence - R(1) -> R(2), R(2) -> R(3), ... , R(n-1) -> R(n). After this process, the data in R(n) are up to date. Then, we continue: R(n) -> R(1), R(1) -> R(2), ... , R(n-2) -> R(n-1). The active repair is done after 2*(n-1) data transfers performed sequentially in 2*(n-1) steps.
> Reduce the amount of data to be transferred during repair
> ---------------------------------------------------------
>
> Key: CASSANDRA-5972
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5972
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jacek Lewandowski
> Priority: Minor
>
> Currently, when a validator finds a token range different in n replicas, data streams are initiated simultaneously between each possible pair of these n nodes, in both directions. It yields n*(n-1) data stream in total.
> It can be done in a sequence - Replica[1] -> R[2], R[2] -> R[3], ... , R[n-1] -> R[n]. After this process, the data in R[n] are up to date. Then, we continue: R[n] -> R[1], R[1] -> R[2], ... , R[n-2] -> R[n-1]. The active repair is done after 2*(n-1) data transfers performed sequentially in 2*(n-1) steps.
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