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Date: Fri, 25 Jan 2013 07:25:12 +0000 (UTC)
From: "Amit Nithian (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
Message-ID: <JIRA.12629227.1359098607209.189827.1359098712799@arcas>
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Subject: [jira] [Created] (SOLR-4354) Replication should perform full copy
 if slave's generation higher than master's
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Amit Nithian created SOLR-4354:
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             Summary: Replication should perform full copy if slave's generation higher than master's
                 Key: SOLR-4354
                 URL: https://issues.apache.org/jira/browse/SOLR-4354
             Project: Solr
          Issue Type: Bug
          Components: replication (java)
    Affects Versions: 4.1
            Reporter: Amit Nithian
             Fix For: 4.2
         Attachments: SOLR-4354.patch

We have dual masters each incrementally indexing from our MySQL database and sit behind a virtual hostname in our load balancer. As such, it's possible that the generation numbers between the masters for a given index are not in sync. Slaves are configured to replicate from this virtual host (and pin based on source/dest IP hash) so we can add and remove masters as necessary (great for maintenance). 

For the most part this works but we've seen the following happen:
* Slave has been pulling from master A
* Master A goes down for maint and now will pull from master B (which has a lower generation number for some reason than master A).
* Slave now tries to pull from master B (has higher index version than slave but lower generation).
* Slave downloads index files, moves them to the index/ directory but these files are deleted during the doCommit() phase (looks like older generation data is deleted).
* Index remains as-is and no change.

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