HBASE-27095 HbckChore should produce a report

In #4470 for HBASE-26192, it was noted that the HbckChore is kind of a pain to use and test
because it maintains a bunch of local state. By contract, the CatalogJanitorChore makes a nice
self-contained report. Let's update HbckChore to do the same.

Signed-off-by: Andrew Purtell <apurtell@apache.org>

Author: ndimiduk

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

@@ -132,6 +132,7 @@
 import org.apache.hadoop.hbase.master.cleaner.LogCleaner;
 import org.apache.hadoop.hbase.master.cleaner.ReplicationBarrierCleaner;
 import org.apache.hadoop.hbase.master.cleaner.SnapshotCleanerChore;
+import org.apache.hadoop.hbase.master.hbck.HbckChore;
 import org.apache.hadoop.hbase.master.http.MasterDumpServlet;
 import org.apache.hadoop.hbase.master.http.MasterRedirectServlet;
 import org.apache.hadoop.hbase.master.http.MasterStatusServlet;

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

@@ -67,6 +67,7 @@
 import org.apache.hadoop.hbase.master.assignment.RegionStateNode;
 import org.apache.hadoop.hbase.master.assignment.RegionStates;
 import org.apache.hadoop.hbase.master.cleaner.HFileCleaner;
+import org.apache.hadoop.hbase.master.hbck.HbckChore;
 import org.apache.hadoop.hbase.master.janitor.MetaFixer;
 import org.apache.hadoop.hbase.master.locking.LockProcedure;
 import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;

hbase-server/src/main/java/org/apache/hadoop/hbase/master/HbckChore.java renamed to hbase-server/src/main/java/org/apache/hadoop/hbase/master/hbck/HbckChore.java

@@ -0,0 +1,110 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hbase.master.hbck;
+
+import java.time.Instant;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hbase.ServerName;
+import org.apache.hadoop.hbase.util.HbckRegionInfo;
+import org.apache.hadoop.hbase.util.Pair;
+import org.apache.yetus.audience.InterfaceAudience;
+
+/**
+ * The result of an {@link HbckChore} execution.
+ */
+@InterfaceAudience.Private
+public class HbckReport {
+
+  private final Map<String, HbckRegionInfo> regionInfoMap = new HashMap<>();
+  private final Set<String> disabledTableRegions = new HashSet<>();
+  private final Set<String> splitParentRegions = new HashSet<>();
+  private final Map<String, ServerName> orphanRegionsOnRS = new HashMap<>();
+  private final Map<String, Path> orphanRegionsOnFS = new HashMap<>();
+  private final Map<String, Pair<ServerName, List<ServerName>>> inconsistentRegions =
+    new HashMap<>();
+
+  private Instant checkingStartTimestamp = null;
+  private Instant checkingEndTimestamp = null;
+
+  /**
+   * Used for web ui to show when the HBCK checking started.
+   */
+  public Instant getCheckingStartTimestamp() {
+    return checkingStartTimestamp;
+  }
+
+  public void setCheckingStartTimestamp(Instant checkingStartTimestamp) {
+    this.checkingStartTimestamp = checkingStartTimestamp;
+  }
+
+  /**
+   * Used for web ui to show when the HBCK checking report generated.
+   */
+  public Instant getCheckingEndTimestamp() {
+    return checkingEndTimestamp;
+  }
+
+  public void setCheckingEndTimestamp(Instant checkingEndTimestamp) {
+    this.checkingEndTimestamp = checkingEndTimestamp;
+  }
+
+  /**
+   * This map contains the state of all hbck items. It maps from encoded region name to
+   * HbckRegionInfo structure. The information contained in HbckRegionInfo is used to detect and
+   * correct consistency (hdfs/meta/deployment) problems.
+   */
+  public Map<String, HbckRegionInfo> getRegionInfoMap() {
+    return regionInfoMap;
+  }
+
+  public Set<String> getDisabledTableRegions() {
+    return disabledTableRegions;
+  }
+
+  public Set<String> getSplitParentRegions() {
+    return splitParentRegions;
+  }
+
+  /**
+   * The regions only opened on RegionServers, but no region info in meta.
+   */
+  public Map<String, ServerName> getOrphanRegionsOnRS() {
+    return orphanRegionsOnRS;
+  }
+
+  /**
+   * The regions have directory on FileSystem, but no region info in meta.
+   */
+  public Map<String, Path> getOrphanRegionsOnFS() {
+    return orphanRegionsOnFS;
+  }
+
+  /**
+   * The inconsistent regions. There are three case: case 1. Master thought this region opened, but
+   * no regionserver reported it. case 2. Master thought this region opened on Server1, but
+   * regionserver reported Server2 case 3. More than one regionservers reported opened this region
+   */
+  public Map<String, Pair<ServerName, List<ServerName>>> getInconsistentRegions() {
+    return inconsistentRegions;
+  }
+}

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

@@ -86,7 +86,7 @@ public class CatalogJanitor extends ScheduledChore {
    * Saved report from last hbase:meta scan to completion. May be stale if having trouble completing
    * scan. Check its date.
    */
-  private volatile Report lastReport;
+  private volatile CatalogJanitorReport lastReport;
 
   public CatalogJanitor(final MasterServices services) {
     super("CatalogJanitor-" + services.getServerName().toShortString(), services,
@@ -228,10 +228,10 @@ && cleanParent(e.getKey(), e.getValue())
 
   /**
    * Scan hbase:meta.
-   * @return Return generated {@link Report}
+   * @return Return generated {@link CatalogJanitorReport}
    */
   // will be override in tests.
-  protected Report scanForReport() throws IOException {
+  protected CatalogJanitorReport scanForReport() throws IOException {
     ReportMakingVisitor visitor = new ReportMakingVisitor(this.services);
     // Null tablename means scan all of meta.
     MetaTableAccessor.scanMetaForTableRegions(this.services.getConnection(), visitor, null);
@@ -241,7 +241,7 @@ protected Report scanForReport() throws IOException {
   /**
    * @return Returns last published Report that comes of last successful scan of hbase:meta.
    */
-  public Report getLastReport() {
+  public CatalogJanitorReport getLastReport() {
     return this.lastReport;
   }
 
@@ -494,7 +494,7 @@ public static void main(String[] args) throws IOException {
         t.put(p);
       }
       MetaTableAccessor.scanMetaForTableRegions(connection, visitor, null);
-      Report report = visitor.getReport();
+      CatalogJanitorReport report = visitor.getReport();
       LOG.info(report != null ? report.toString() : "empty");
     }
   }

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

@@ -34,7 +34,7 @@
  * Report made by ReportMakingVisitor
  */
 @InterfaceAudience.Private
-public class Report {
+public class CatalogJanitorReport {
   private final long now = EnvironmentEdgeManager.currentTime();
 
   // Keep Map of found split parents. These are candidates for cleanup.

hbase-server/src/main/java/org/apache/hadoop/hbase/master/janitor/Report.java renamed to hbase-server/src/main/java/org/apache/hadoop/hbase/master/janitor/CatalogJanitorReport.java

@@ -73,7 +73,7 @@ public MetaFixer(MasterServices masterServices) {
   }
 
   public void fix() throws IOException {
-    Report report = this.masterServices.getCatalogJanitor().getLastReport();
+    CatalogJanitorReport report = this.masterServices.getCatalogJanitor().getLastReport();
     if (report == null) {
       LOG.info("CatalogJanitor has not generated a report yet; run 'catalogjanitor_run' in "
         + "shell or wait until CatalogJanitor chore runs.");
@@ -90,7 +90,7 @@ public void fix() throws IOException {
    * If hole, it papers it over by adding a region in the filesystem and to hbase:meta. Does not
    * assign.
    */
-  void fixHoles(Report report) {
+  void fixHoles(CatalogJanitorReport report) {
     final List<Pair<RegionInfo, RegionInfo>> holes = report.getHoles();
     if (holes.isEmpty()) {
       LOG.info("CatalogJanitor Report contains no holes to fix. Skipping.");
@@ -220,7 +220,7 @@ private static List<RegionInfo> createMetaEntries(final MasterServices masterSer
   /**
    * Fix overlaps noted in CJ consistency report.
    */
-  List<Long> fixOverlaps(Report report) throws IOException {
+  List<Long> fixOverlaps(CatalogJanitorReport report) throws IOException {
     List<Long> pidList = new ArrayList<>();
     for (Set<RegionInfo> regions : calculateMerges(maxMergeCount, report.getOverlaps())) {
       RegionInfo[] regionsArray = regions.toArray(new RegionInfo[] {});

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

@@ -54,7 +54,7 @@ class ReportMakingVisitor implements ClientMetaTableAccessor.CloseableVisitor {
   /**
    * Report is not done until after the close has been called.
    */
-  private Report report = new Report();
+  private CatalogJanitorReport report = new CatalogJanitorReport();
 
   /**
    * RegionInfo from previous row.
@@ -77,7 +77,7 @@ class ReportMakingVisitor implements ClientMetaTableAccessor.CloseableVisitor {
   /**
    * Do not call until after {@link #close()}. Will throw a {@link RuntimeException} if you do.
    */
-  Report getReport() {
+  CatalogJanitorReport getReport() {
     if (!this.closed) {
       throw new RuntimeException("Report not ready until after close()");
     }