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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