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https://issues.apache.org/jira/browse/COUCHDB-3006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15260804#comment-15260804
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ASF GitHub Bot commented on COUCHDB-3006:
-----------------------------------------
GitHub user nickva opened a pull request:
https://github.com/apache/couchdb-couch-replicator/pull/37
Add jittered delay during replication error handling
For one-to-many replications, when source fails, it
can create a stampede effect. A jittered delay is
used to avoid that.
Delay is random, in a range proportional to
current number of replications, with a maximum of
1 minute.
Seed random number generator within each
replication process with a non-deterministic value,
otherwise the same sequence of delays is generated
for all replications.
Jira: COUCHDB-3006
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloudant/couchdb-couch-replicator couchdb-3006
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/couchdb-couch-replicator/pull/37.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #37
----
commit 0f9bc69f37ae970371af64525ae6c77332e60a07
Author: Nick Vatamaniuc <[email protected]>
Date: 2016-04-27T19:21:14Z
Add jittered delay during replication error handling
For one-to-many replications, when source fails, it
can create a stampede effect. A jittered delay is
used to avoid that.
Delay is random, in a range proportional to
current number of replications, with a maximum of
1 minute.
Seed random number generator within each
replication process with a non-deterministic value,
otherwise the same sequence of delays is generated
for all replications.
Jira: COUCHDB-3006
----
> Source failure in one source to many target replications causes a stampede
> --------------------------------------------------------------------------
>
> Key: COUCHDB-3006
> URL: https://issues.apache.org/jira/browse/COUCHDB-3006
> Project: CouchDB
> Issue Type: Bug
> Reporter: Nick Vatamaniuc
>
> For multiple replications from a single source to multiple targets. If source
> fails, all replications post an error state back their replication document
> and attempt to restart. This creates a stampede effect and causes sharp load
> spikes on the replication cluster.
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