[jira] [Created] (SOLR-9438) Shard split can lose data

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

Shalin Shekhar Mangar created SOLR-9438:
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             Summary: Shard split can lose data
                 Key: SOLR-9438
                 URL: https://issues.apache.org/jira/browse/SOLR-9438
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: SolrCloud
    Affects Versions: 6.1, 5.5.2, 4.10.4
            Reporter: Shalin Shekhar Mangar
            Assignee: Shalin Shekhar Mangar
             Fix For: master (7.0), 6.3


Solr’s shard split can lose documents if the parent/sub-shard leader is killed (or crashes) between the time that the new sub-shard replica is created and before it recovers. In such a case the slice has already been set to ‘recovery’ state, the sub-shard replica comes up, finds that no other replica is up, waits until the leader vote wait time and then proceeds to become the leader as well as publish itself as active. Once that happens the overseer seeing that all replicas of the sub-shard are now ‘active’, sets the parent slice as ‘inactive’ and the new sub-shard as ‘active’.



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