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From "Zhen Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HELIX-444) add per-participant partition count gauges to helix
Date Wed, 14 May 2014 18:35:15 GMT

    [ https://issues.apache.org/jira/browse/HELIX-444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13997869#comment-13997869

Zhen Zhang commented on HELIX-444:



> add per-participant partition count gauges to helix
> ---------------------------------------------------
>                 Key: HELIX-444
>                 URL: https://issues.apache.org/jira/browse/HELIX-444
>             Project: Apache Helix
>          Issue Type: Improvement
>            Reporter: Zhen Zhang
>            Assignee: Zhen Zhang
> We need a way to pull the known down partition counts out of DifferenceWithIdealState
when an instance is offline, reducing the alert volume to solely the down instance notification.
Without metrics from helix indicating the number of partitions hosted on a given participant,
we can't reason as to which "DifferenceWithIdealState" counts are supposed to be down and
which are an actually difference caused by something other than a node outage.
> These should be produced on a per-participant, per-resource basis (ie., helix.i001.participantstatus.cluster.host.db.partitiongauge
= 64 or whatever)

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