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From "Richard Ding (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9426) Make custom distributed barrier procedure pluggable
Date Wed, 04 Sep 2013 00:01:53 GMT
Richard Ding created HBASE-9426:

             Summary: 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: 0.94.11, 0.95.2
            Reporter: Richard Ding
            Assignee: Richard Ding

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:


The values for both are comma delimited list of classes. On region server side, the classes
implements the following interface:

public interface RegionServerProcedureManager {
  public void initialize(RegionServerServices rss) throws KeeperException;
  public void start();
  public void stop(boolean force) throws IOException;
  public String getProcedureName();

While on Master side, the classes implement the interface:

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;

Where the ProcedureDescription is defined as

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;

A generic API can be defined on HMaster to trigger a procedure:

public boolean execProcedure(ProcedureDescription desc) throws IOException;

_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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