[jira] [Created] (SOLR-7569) Create an API to force a leader election between nodes

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

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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