[jira] [Updated] (HBASE-9426) Make custom distributed barrier procedure pluggable

["Richard Ding (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-9426?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Richard Ding updated HBASE-9426:
--------------------------------

    Attachment: HBASE-9426.patch.1

Attaching a patch that implements the pluggable procedure on the region server side.

Please let me know what you think. I'll add another patch for the master side.
                
> Make custom distributed barrier procedure pluggable 
> ----------------------------------------------------
>
>                 Key: HBASE-9426
>                 URL: https://issues.apache.org/jira/browse/HBASE-9426
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.95.2, 0.94.11
>            Reporter: Richard Ding
>            Assignee: Richard Ding
>         Attachments: HBASE-9426.patch.1
>
>
> Currently if one wants to implement a custom distributed barrier procedure (e.g., distributed log roll or distributed table flush), the HBase core code needs to be modified in order for the procedure to work.
> Looking into the snapshot code (especially on region server side), most of the code to enable the procedure are generic life-cycle management (i.e., init, start, stop). We can make this part pluggable.
> Here is the proposal. Following the coprocessor example, we define two properties:
> {code}
> hbase.procedure.regionserver.classes
> hbase.procedure.master.classes
> {code}
> The values for both are comma delimited list of classes. On region server side, the classes implements the following interface:
> {code}
> public interface RegionServerProcedureManager {
>   public void initialize(RegionServerServices rss) throws KeeperException;
>   public void start();
>   public void stop(boolean force) throws IOException;
>   public String getProcedureName();
> }
> {code}
> While on Master side, the classes implement the interface:
> {code}
> public interface MasterProcedureManager {
>   public void initialize(MasterServices master) throws KeeperException, IOException, UnsupportedOperationException;
>   public void stop(String why);
>   public String getProcedureName();
>   public void execProcedure(ProcedureDescription desc) throws IOException;
>   IOException;
> }
> {code}
> Where the ProcedureDescription is defined as
> {code}
> message ProcedureDescription {
>   required string name = 1;
>   required string instance = 2;
>   optional int64 creationTime = 3 [default = 0];
>   message Property {
>     required string tag = 1;
>     optional string value = 2;
>   }
>   repeated Property props = 4;
> }
> {code}
> A generic API can be defined on HMaster to trigger a procedure:
> {code}
> public boolean execProcedure(ProcedureDescription desc) throws IOException;
> {code}
> _SnapshotManager_ and _RegionServerSnapshotManager_ are special examples of _MasterProcedureManager_ and _RegionServerProcedureManager_. They will be automatically included (users don't need to specify them in the conf file).

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