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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-11844) Ozone: Recover SCM state when SCM is restarted
Date Wed, 17 May 2017 22:18:04 GMT
Weiwei Yang created HDFS-11844:
----------------------------------

             Summary: Ozone: Recover SCM state when SCM is restarted
                 Key: HDFS-11844
                 URL: https://issues.apache.org/jira/browse/HDFS-11844
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ozone, scm
            Reporter: Weiwei Yang
            Assignee: Weiwei Yang


SCM losses its state once being restarted. A simple test can be done by following steps

# Start NN, DN, SCM
# Create several containers via SCM CLI
# Restart SCM
# Get existing container state via SCM CLI, this step will fail with container doesn't exist
error.

{{ContainerManagerImpl}} maintains a cache of container mapping {{containerMap}}, if SCM is
restarted, this information is lost. We need a way to restore the state from DB in a background
thread.



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