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From "Nanda kumar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12980) Ozone: SCM: Restructuring container state transition and events
Date Tue, 02 Jan 2018 21:02:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16308702#comment-16308702
] 

Nanda kumar commented on HDFS-12980:
------------------------------------

 *Event and State Transition Mapping*
{noformat}
 State: ALLOCATED ---------------> CREATING
 Event:                CREATE

 State: CREATING  ---------------> OPEN
 Event:               CREATED

 State: OPEN      ---------------> CLOSING
 Event:               FINALIZE
 
 State: CLOSING   ---------------> CLOSED
 Event:                CLOSE

 State: CLOSED   ----------------> DELETING
 Event:                DELETE

 State: DELETING ----------------> DELETED
 Event:               CLEANUP

 State: CREATING  ---------------> DELETING
 Event:               TIMEOUT
{noformat}

> Ozone: SCM: Restructuring container state transition and events
> ---------------------------------------------------------------
>
>                 Key: HDFS-12980
>                 URL: https://issues.apache.org/jira/browse/HDFS-12980
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Nanda kumar
>            Assignee: Nanda kumar
>
> Existing state transition of containers
> {noformat}
> ALLOCATED --------------> CREATING ------------------> OPEN ----------------->
PENDING_CLOSE ----------> CLOSED
>           (BEGIN_CREATE)     |      (COMPLETE_CREATE)    |    (FULL_CONTAINER)      
         (CLOSE)
>                              |                           |
>                              |                           |
>                              | (TIMEOUT)                 | (DELETE)
>                              |                           |
>                              +---------> DELETING <------+
>                                             |
>                                             |
>                                             | (CLEANUP)
>                                             |
>                                         DELETED
> {noformat}
> We don't have support for deleting a CLOSED container in this.
> *Proposal*
> {noformat}
>  [ALLOCATED]------->[CREATING]--------->[OPEN]---------->[CLOSING]------->[CLOSED]
>             (CREATE)     |    (CREATED)       (FINALIZE)          (CLOSE)    |
>                          |                                                   |
>                          |                                                   |
>                          |(TIMEOUT)                                  (DELETE)|
>                          |                                                   |
>                          +------------------> [DELETING] <-------------------+
>                                                    |
>                                                    |
>                                           (CLEANUP)|
>                                                    |
>                                                [DELETED]
> {noformat}



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