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  1. Solr
  2. SOLR-7569

Create an API to force a leader election between nodes

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    Description

      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.

      Attachments

        1. SOLR-7569.patch
          20 kB
          Ishan Chattopadhyaya
        2. SOLR-7569.patch
          21 kB
          Ishan Chattopadhyaya
        3. SOLR-7569_lir_down_state_test.patch
          6 kB
          Ishan Chattopadhyaya
        4. SOLR-7569.patch
          15 kB
          Ishan Chattopadhyaya
        5. SOLR-7569.patch
          15 kB
          Ishan Chattopadhyaya
        6. SOLR-7569.patch
          18 kB
          Ishan Chattopadhyaya
        7. SOLR-7569.patch
          18 kB
          Ishan Chattopadhyaya
        8. SOLR-7569.patch
          32 kB
          Ishan Chattopadhyaya
        9. SOLR-7569.patch
          34 kB
          Ishan Chattopadhyaya
        10. SOLR-7569.patch
          34 kB
          Ishan Chattopadhyaya
        11. SOLR-7569.patch
          35 kB
          Ishan Chattopadhyaya
        12. SOLR-7569.patch
          36 kB
          Ishan Chattopadhyaya
        13. SOLR-7569.patch
          8 kB
          Ishan Chattopadhyaya
        14. SOLR-7569.patch
          34 kB
          Ishan Chattopadhyaya
        15. SOLR-7569.patch
          29 kB
          Ishan Chattopadhyaya
        16. SOLR-7569.patch
          29 kB
          Ishan Chattopadhyaya
        17. SOLR-7569.patch
          30 kB
          Ishan Chattopadhyaya
        18. SOLR-7569-testfix.patch
          2 kB
          Ishan Chattopadhyaya

        Issue Links

          contains

          Improvement - An improvement or enhancement to an existing feature or task. SOLR-8233 Core admin API for overriding last published state

          • Major - Major loss of function.
          • Resolved
          depends upon

          Bug - A problem which impairs or prevents the functions of the product. SOLR-7989 After a new leader is elected it, it should ensure it's state is ACTIVE if it has already registered with ZK.

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. SOLR-9305 ForceLeaderTest.testReplicasInLIRNoLeader(): connection refused

          • Major - Major loss of function.
          • Closed

          New Feature - A new feature of the product, which has yet to be developed. SOLR-5991 SolrCloud: Add API to move leader off a Solr instance

          • Major - Major loss of function.
          • Reopened

          Activity

            People

              noble.paul Noble Paul
              shalin Shalin Shekhar Mangar
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              Dates

                Created:
                Updated:
                Resolved: