[jira] [Created] (SOLR-6279) cores?action=UNLOAD can unregister unclosed core

["Christine Poerschke (JIRA)" <ji...@apache.org>]

Christine Poerschke created SOLR-6279:
-----------------------------------------

             Summary: cores?action=UNLOAD can unregister unclosed core
                 Key: SOLR-6279
                 URL: https://issues.apache.org/jira/browse/SOLR-6279
             Project: Solr
          Issue Type: Bug
            Reporter: Christine Poerschke


baseline:

{code}
  /somewhere/instanceA/collection1_shard1/core.properties
  /somewhere/instanceA/collection1_shard1/data
  /somewhere/instanceA/collection1_shard2/core.properties
  /somewhere/instanceA/collection1_shard2/data

  /somewhere/instanceB
{code}

actions:

{code}
  curl "http://host:port/solr/admin/cores?action=UNLOAD&core=collection1_shard2"

  # since UNLOAD completed we should now be free to move the unloaded core's files as we wish

  mv /somewhere/instanceA/collection1_shard2 /somewhere/instanceB/collection1_shard2
{code}

expected result:

{code}
  /somewhere/instanceA/collection1_shard1/core.properties
  /somewhere/instanceA/collection1_shard1/data

  # collection1_shard2 files have been fully relocated

  /somewhere/instanceB/collection1_shard2/core.properties.unloaded
  /somewhere/instanceB/collection1_shard2/data
{code}

actual result:

{code}
  /somewhere/instanceA/collection1_shard1/core.properties
  /somewhere/instanceA/collection1_shard1/data
  /somewhere/instanceA/collection1_shard2/data

  # collection1_shard2 files have not been fully relocated and/or some files were left behind in instanceA because the UNLOAD action had returned prior to the core being closed

  /somewhere/instanceB/collection1_shard2/core.properties.unloaded
  /somewhere/instanceB/collection1_shard2/data
{code}


+proposed fix:+ Changing CoreContainer.unload to wait for core to close before unregistering it from ZK. Adding testMidUseUnload method to TestLazyCores.




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