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  1. Solr
  2. SOLR-4354

Replication should perform full copy if slave's generation higher than master's

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 4.1
    • Fix Version/s: 4.2
    • Component/s: replication (java)
    • Labels:
      None

      Description

      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.

        Attachments

        1. SOLR-4354.patch
          0.9 kB
          Amit Nithian

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              • Assignee:
                markrmiller@gmail.com Mark Miller
                Reporter:
                anithian Amit Nithian
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