HBASE-24164 Retain the ReadRequests and WriteRequests of region on we… (#1500)

Signed-off-by: stack <stack@apache.org>

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

@@ -151,6 +151,11 @@ public class TransitRegionStateProcedure
     this.forceNewPlan = forceNewPlan;
     this.type = type;
     setInitalAndLastState();
+
+    // when do reopen TRSP, let the rs know the targetServer so it can keep some info on close
+    if (type == TransitionType.REOPEN) {
+      this.assignCandidate = getRegionStateNode(env).getRegionLocation();
+    }
   }
 
   @Override

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java

@@ -872,6 +872,19 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
     this.maxCellSize = conf.getLong(HBASE_MAX_CELL_SIZE_KEY, DEFAULT_MAX_CELL_SIZE);
     this.miniBatchSize = conf.getInt(HBASE_REGIONSERVER_MINIBATCH_SIZE,
         DEFAULT_HBASE_REGIONSERVER_MINIBATCH_SIZE);
+
+    // recover the metrics of read and write requests count if they were retained
+    if (rsServices != null && rsServices.getRegionServerAccounting() != null) {
+      Pair<Long, Long> retainedRWRequestsCnt = rsServices.getRegionServerAccounting()
+        .getRetainedRegionRWRequestsCnt().get(getRegionInfo().getEncodedName());
+      if (retainedRWRequestsCnt != null) {
+        this.setReadRequestsCount(retainedRWRequestsCnt.getFirst());
+        this.setWriteRequestsCount(retainedRWRequestsCnt.getSecond());
+        // remove them since won't use again
+        rsServices.getRegionServerAccounting().getRetainedRegionRWRequestsCnt()
+          .remove(getRegionInfo().getEncodedName());
+      }
+    }
   }
 
   void setHTableSpecificConf() {
@@ -8942,4 +8955,14 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver, Regi
       }
     }
   }
+
+  @VisibleForTesting
+  public void setReadRequestsCount(long readRequestsCount) {
+    this.readRequestsCount.add(readRequestsCount);
+  }
+
+  @VisibleForTesting
+  public void setWriteRequestsCount(long writeRequestsCount) {
+    this.writeRequestsCount.add(writeRequestsCount);
+  }
 }

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java

@@ -3291,7 +3291,12 @@ public class HRegionServer extends HasThread implements
         closeSeqNum = r.getOpenSeqNum();
         if (closeSeqNum == HConstants.NO_SEQNUM) closeSeqNum = 0;
       }
-      addToMovedRegions(r.getRegionInfo().getEncodedName(), destination, closeSeqNum);
+      boolean selfMove = ServerName.isSameAddress(destination, this.getServerName());
+      addToMovedRegions(r.getRegionInfo().getEncodedName(), destination, closeSeqNum, selfMove);
+      if (selfMove) {
+        this.regionServerAccounting.getRetainedRegionRWRequestsCnt().put(r.getRegionInfo().getEncodedName()
+          , new Pair<>(r.getReadRequestsCount(), r.getWriteRequestsCount()));
+      }
     }
     this.regionFavoredNodesMap.remove(r.getRegionInfo().getEncodedName());
     return toReturn != null;
@@ -3453,8 +3458,8 @@ public class HRegionServer extends HasThread implements
    */
   private static final int TIMEOUT_REGION_MOVED = (2 * 60 * 1000);
 
-  private void addToMovedRegions(String encodedName, ServerName destination, long closeSeqNum) {
-    if (ServerName.isSameAddress(destination, this.getServerName())) {
+  private void addToMovedRegions(String encodedName, ServerName destination, long closeSeqNum, boolean selfMove) {
+    if (selfMove) {
       LOG.warn("Not adding moved region record: " + encodedName + " to self.");
       return;
     }

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionServerAccounting.java

@@ -19,6 +19,8 @@
 package org.apache.hadoop.hbase.regionserver;
 
 import java.lang.management.MemoryType;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.atomic.LongAdder;
 
 import org.apache.hadoop.conf.Configuration;
@@ -47,6 +49,11 @@ public class RegionServerAccounting {
   private long globalOnHeapMemstoreLimit;
   private long globalOnHeapMemstoreLimitLowMark;
 
+  // encoded region name -> Pair -> read count as first, write count as second.
+  // when region close and target rs is the current server, we will put an entry,
+  // and will remove it when reigon open after recover them.
+  private ConcurrentMap<String, Pair<Long, Long>> retainedRegionRWRequestsCnt;
+
   public RegionServerAccounting(Configuration conf) {
     Pair<Long, MemoryType> globalMemstoreSizePair = MemorySizeUtil.getGlobalMemStoreSize(conf);
     this.globalMemStoreLimit = globalMemstoreSizePair.getFirst();
@@ -67,6 +74,7 @@ public class RegionServerAccounting {
     this.globalOnHeapMemstoreLimit = MemorySizeUtil.getOnheapGlobalMemStoreSize(conf);
     this.globalOnHeapMemstoreLimitLowMark =
         (long) (this.globalOnHeapMemstoreLimit * this.globalMemStoreLimitLowMarkPercent);
+    this.retainedRegionRWRequestsCnt = new ConcurrentHashMap<>();
   }
 
   long getGlobalMemStoreLimit() {
@@ -123,6 +131,13 @@ public class RegionServerAccounting {
     return this.globalMemStoreOffHeapSize.sum();
   }
 
+  /**
+   * @return the retained metrics of region's read and write requests count
+   */
+  protected ConcurrentMap<String, Pair<Long, Long>> getRetainedRegionRWRequestsCnt() {
+    return this.retainedRegionRWRequestsCnt;
+  }
+
   void incGlobalMemStoreSize(MemStoreSize mss) {
     incGlobalMemStoreSize(mss.getDataSize(), mss.getHeapSize(), mss.getOffHeapSize());
   }

hbase-server/src/test/java/org/apache/hadoop/hbase/master/assignment/TestTransitRegionStateProcedure.java

@@ -17,6 +17,7 @@
  */
 package org.apache.hadoop.hbase.master.assignment;
 
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
@@ -130,6 +131,8 @@ public class TestTransitRegionStateProcedure {
       UTIL.getMiniHBaseCluster().getMaster().getMasterProcedureExecutor().getEnvironment();
     HRegionServer rs = UTIL.getRSForFirstRegionInTable(tableName);
     HRegion region = rs.getRegions(tableName).get(0);
+    region.setReadRequestsCount(1);
+    region.setWriteRequestsCount(2);
     long openSeqNum = region.getOpenSeqNum();
     TransitRegionStateProcedure proc =
       TransitRegionStateProcedure.reopen(env, region.getRegionInfo());
@@ -139,6 +142,8 @@ public class TestTransitRegionStateProcedure {
     long openSeqNum2 = region2.getOpenSeqNum();
     // confirm that the region is successfully opened
     assertTrue(openSeqNum2 > openSeqNum);
+    assertEquals(1, region2.getReadRequestsCount());
+    assertEquals(2, region2.getWriteRequestsCount());
   }
 
   @Test