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From "Pushkar Raste (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-9689) Process updates concurrently during {{PeerSync}}
Date Mon, 24 Oct 2016 22:20:58 GMT
Pushkar Raste created SOLR-9689:
-----------------------------------

             Summary: Process updates concurrently during {{PeerSync}}
                 Key: SOLR-9689
                 URL: https://issues.apache.org/jira/browse/SOLR-9689
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Pushkar Raste


This came up during discussion with [~shalinmangar]

During {{PeerSync}}, updates are applied one a time by looping through the updates received
from the leader. This is slow and could keep node in recovery for a long time if number of
updates to apply were large. 

We can apply updates concurrently, this should be no different than what could happen during
normal indexing (we can't really ensure that a replica will process updates in the same order
as the leader or other replicas).

There are few corner cases around dbq we should be careful about. 



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