HBASE-19990 Create remote wal directory when transitting to state S

hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/ProcedureYieldException.java

@@ -15,16 +15,21 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.apache.hadoop.hbase.procedure2;
 
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.yetus.audience.InterfaceStability;
 
-// TODO: Not used yet
+/**
+ * Indicate that a procedure wants to be rescheduled. Usually because there are something wrong but
+ * we do not want to fail the procedure.
+ * <p>
+ * TODO: need to support scheduling after a delay.
+ */
 @InterfaceAudience.Private
 @InterfaceStability.Stable
 public class ProcedureYieldException extends ProcedureException {
+
   /** default constructor */
   public ProcedureYieldException() {
     super();

hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/ReplicationUtils.java

@@ -41,6 +41,8 @@ public final class ReplicationUtils {
 
   public static final String REPLICATION_ATTR_NAME = "__rep__";
 
+  public static final String REMOTE_WAL_DIR_NAME = "remoteWALs";
+
   private ReplicationUtils() {
   }
 

hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java

@@ -41,6 +41,7 @@ import org.apache.hadoop.hbase.log.HBaseMarkers;
 import org.apache.hadoop.hbase.mob.MobConstants;
 import org.apache.hadoop.hbase.procedure2.store.wal.WALProcedureStore;
 import org.apache.hadoop.hbase.regionserver.HRegion;
+import org.apache.hadoop.hbase.replication.ReplicationUtils;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.FSTableDescriptors;
 import org.apache.hadoop.hbase.util.FSUtils;
@@ -133,7 +134,6 @@ public class MasterFileSystem {
    * Idempotent.
    */
   private void createInitialFileSystemLayout() throws IOException {
-
     final String[] protectedSubDirs = new String[] {
         HConstants.BASE_NAMESPACE_DIR,
         HConstants.HFILE_ARCHIVE_DIRECTORY,
@@ -145,7 +145,8 @@ public class MasterFileSystem {
       HConstants.HREGION_LOGDIR_NAME,
       HConstants.HREGION_OLDLOGDIR_NAME,
       HConstants.CORRUPT_DIR_NAME,
-      WALProcedureStore.MASTER_PROCEDURE_LOGDIR
+      WALProcedureStore.MASTER_PROCEDURE_LOGDIR,
+      ReplicationUtils.REMOTE_WAL_DIR_NAME
     };
     // check if the root directory exists
     checkRootDir(this.rootdir, conf, this.fs);
@@ -192,7 +193,9 @@ public class MasterFileSystem {
     return this.fs;
   }
 
-  protected FileSystem getWALFileSystem() { return this.walFs; }
+  public FileSystem getWALFileSystem() {
+    return this.walFs;
+  }
 
   public Configuration getConfiguration() {
     return this.conf;
@@ -235,12 +238,8 @@ public class MasterFileSystem {
 
   /**
    * Get the rootdir. Make sure its wholesome and exists before returning.
-   * @param rd
-   * @param c
-   * @param fs
-   * @return hbase.rootdir (after checks for existence and bootstrapping if
-   * needed populating the directory with necessary bootup files).
-   * @throws IOException
+   * @return hbase.rootdir (after checks for existence and bootstrapping if needed populating the
+   *         directory with necessary bootup files).
    */
   private Path checkRootDir(final Path rd, final Configuration c, final FileSystem fs)
       throws IOException {

hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/MasterProcedureEnv.java

@@ -25,6 +25,7 @@ import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.conf.ConfigurationObserver;
 import org.apache.hadoop.hbase.ipc.RpcServer;
 import org.apache.hadoop.hbase.master.MasterCoprocessorHost;
+import org.apache.hadoop.hbase.master.MasterFileSystem;
 import org.apache.hadoop.hbase.master.MasterServices;
 import org.apache.hadoop.hbase.master.assignment.AssignmentManager;
 import org.apache.hadoop.hbase.master.replication.ReplicationPeerManager;
@@ -139,6 +140,10 @@ public class MasterProcedureEnv implements ConfigurationObserver {
     return master.getReplicationPeerManager();
   }
 
+  public MasterFileSystem getMasterFileSystem() {
+    return master.getMasterFileSystem();
+  }
+
   public boolean isRunning() {
     if (this.master == null || this.master.getMasterProcedureExecutor() == null) return false;
     return master.getMasterProcedureExecutor().isRunning();

hbase-server/src/main/java/org/apache/hadoop/hbase/master/replication/TransitPeerSyncReplicationStateProcedure.java

@@ -20,14 +20,18 @@ package org.apache.hadoop.hbase.master.replication;
 import java.io.IOException;
 import java.util.List;
 import java.util.stream.Collectors;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.client.RegionInfo;
 import org.apache.hadoop.hbase.client.replication.ReplicationPeerConfigUtil;
 import org.apache.hadoop.hbase.master.MasterCoprocessorHost;
+import org.apache.hadoop.hbase.master.MasterFileSystem;
 import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
 import org.apache.hadoop.hbase.procedure2.ProcedureStateSerializer;
 import org.apache.hadoop.hbase.procedure2.ProcedureSuspendedException;
 import org.apache.hadoop.hbase.procedure2.ProcedureYieldException;
 import org.apache.hadoop.hbase.replication.ReplicationException;
+import org.apache.hadoop.hbase.replication.ReplicationUtils;
 import org.apache.hadoop.hbase.replication.SyncReplicationState;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;
@@ -205,7 +209,22 @@ public class TransitPeerSyncReplicationStateProcedure
         }
         return Flow.HAS_MORE_STATE;
       case CREATE_DIR_FOR_REMOTE_WAL:
-        // TODO: create wal for write remote wal
+        MasterFileSystem mfs = env.getMasterFileSystem();
+        Path remoteWALDir = new Path(mfs.getWALRootDir(), ReplicationUtils.REMOTE_WAL_DIR_NAME);
+        Path remoteWALDirForPeer = new Path(remoteWALDir, peerId);
+        FileSystem walFs = mfs.getWALFileSystem();
+        try {
+          if (walFs.exists(remoteWALDirForPeer)) {
+            LOG.warn("Wal dir {} already exists, usually this should not happen, continue anyway",
+              remoteWALDirForPeer);
+          } else if (!walFs.mkdirs(remoteWALDirForPeer)) {
+            LOG.warn("Can not create remote wal dir {}", remoteWALDirForPeer);
+            throw new ProcedureYieldException();
+          }
+        } catch (IOException e) {
+          LOG.warn("Failed to create remote wal dir {}", remoteWALDirForPeer, e);
+          throw new ProcedureYieldException();
+        }
         setNextState(
           PeerSyncReplicationStateTransitionState.POST_PEER_SYNC_REPLICATION_STATE_TRANSITION);
         return Flow.HAS_MORE_STATE;

hbase-server/src/test/java/org/apache/hadoop/hbase/replication/TestSyncReplication.java

@@ -19,7 +19,9 @@ package org.apache.hadoop.hbase.replication;
 
 import static org.hamcrest.CoreMatchers.containsString;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertThat;
+import static org.junit.Assert.assertTrue;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -45,6 +47,7 @@ import org.apache.hadoop.hbase.client.RowMutations;
 import org.apache.hadoop.hbase.client.Table;
 import org.apache.hadoop.hbase.client.TableDescriptor;
 import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
+import org.apache.hadoop.hbase.master.MasterFileSystem;
 import org.apache.hadoop.hbase.regionserver.HRegion;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.testclassification.ReplicationTests;
@@ -154,8 +157,13 @@ public class TestSyncReplication {
 
   @Test
   public void testStandby() throws Exception {
+    MasterFileSystem mfs = UTIL2.getHBaseCluster().getMaster().getMasterFileSystem();
+    Path remoteWALDir = new Path(mfs.getWALRootDir(), ReplicationUtils.REMOTE_WAL_DIR_NAME);
+    Path remoteWALDirForPeer = new Path(remoteWALDir, PEER_ID);
+    assertFalse(mfs.getWALFileSystem().exists(remoteWALDirForPeer));
     UTIL2.getAdmin().transitReplicationPeerSyncReplicationState(PEER_ID,
       SyncReplicationState.STANDBY);
+    assertTrue(mfs.getWALFileSystem().exists(remoteWALDirForPeer));
     try (Table table = UTIL2.getConnection().getTable(TABLE_NAME)) {
       assertDisallow(table, t -> t.get(new Get(Bytes.toBytes("row"))));
       assertDisallow(table,