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https://issues.apache.org/jira/browse/SOLR-3751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444996#comment-13444996
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Mark Miller commented on SOLR-3751:
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When doing a replicate from a leader, we can also check that the leader locally
thinks he is the leader.
> Add defensive checks against errant updates to distrib update processor.
> ------------------------------------------------------------------------
>
> Key: SOLR-3751
> URL: https://issues.apache.org/jira/browse/SOLR-3751
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Reporter: Mark Miller
> Assignee: Mark Miller
> Priority: Minor
> Fix For: 4.0, 5.0
>
>
> The distrib update processor should do sanity checks on incoming updates -
> you never know what greedy routers might hang to some packets for while
> before letting them go.
> We can quickly and easily check a couple things.
> If the update is from a Leader we can check that we don't currently think we
> are the leader (using a local isLeader state).
> If the update is from a Leader we can check that that leader matches what is
> in our current ClusterState.
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