Shalin Shekhar Mangar created SOLR-7569:
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Summary: Create an API to force a leader election between nodes
Key: SOLR-7569
URL: https://issues.apache.org/jira/browse/SOLR-7569
Project: Solr
Issue Type: New Feature
Components: SolrCloud
Reporter: Shalin Shekhar Mangar
There are many reasons why Solr will not elect a leader for a shard e.g. all
replicas' last published state was recovery or due to bugs which cause a leader
to be marked as 'down'. While the best solution is that they never get into
this state, we need a manual way to fix this when it does get into this state.
Right now we can do a series of dance involving bouncing the node (since
recovery paths between bouncing and REQUESTRECOVERY are different), but that is
difficult when running a large cluster. Although it is possible that such a
manual API may lead to some data loss but in some cases, it is the only
possible option to restore availability.
This issue proposes to build a new collection API which can be used to force
replicas into recovering a leader while avoiding data loss on a best effort
basis.
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