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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-8586) Implement hash over all documents to check for shard synchronization
Date Wed, 27 Jan 2016 03:59:39 GMT

    [ https://issues.apache.org/jira/browse/SOLR-8586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15118596#comment-15118596
] 

Yonik Seeley commented on SOLR-8586:
------------------------------------

bq. I wonder if adding hashes of the version might be prone to problems if the version of
any given document tends to be identical to many other documents

Nope, versions are unique to a shard (the leader assigns a unique version to every update).

> Implement hash over all documents to check for shard synchronization
> --------------------------------------------------------------------
>
>                 Key: SOLR-8586
>                 URL: https://issues.apache.org/jira/browse/SOLR-8586
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Yonik Seeley
>         Attachments: SOLR-8586.patch
>
>
> An order-independent hash across all of the versions in the index should suffice.  The
hash itself is pretty easy, but we need to figure out when/where to do this check (for example,
I think PeerSync is currently used in multiple contexts and this check would perhaps not be
appropriate for all PeerSync calls?)



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