HBASE-26479: Print too slow/big scan's operation_id in region server log

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

@@ -74,6 +74,7 @@
 import org.apache.hadoop.hbase.client.Get;
 import org.apache.hadoop.hbase.client.Increment;
 import org.apache.hadoop.hbase.client.Mutation;
+import org.apache.hadoop.hbase.client.OperationWithAttributes;
 import org.apache.hadoop.hbase.client.Put;
 import org.apache.hadoop.hbase.client.RegionInfo;
 import org.apache.hadoop.hbase.client.RegionReplicaUtil;
@@ -1278,6 +1279,7 @@ public String getScanDetailsWithId(long scannerId) {
     StringBuilder builder = new StringBuilder();
     builder.append("table: ").append(scanner.getRegionInfo().getTable().getNameAsString());
     builder.append(" region: ").append(scanner.getRegionInfo().getRegionNameAsString());
+    builder.append(" operation_id: ").append(scanner.getOperationId());
     return builder.toString();
   }
 
@@ -1290,6 +1292,12 @@ public String getScanDetailsWithRequest(ScanRequest request) {
       StringBuilder builder = new StringBuilder();
       builder.append("table: ").append(region.getRegionInfo().getTable().getNameAsString());
       builder.append(" region: ").append(region.getRegionInfo().getRegionNameAsString());
+      for (NameBytesPair pair : request.getScan().getAttributeList()) {
+        if (OperationWithAttributes.ID_ATRIBUTE.equals(pair.getName())) {
+          builder.append(" operation_id: ").append(Bytes.toString(pair.getValue().toByteArray()));
+          break;
+        }
+      }
       return builder.toString();
     } catch (IOException ignored) {
       return null;

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

@@ -73,6 +73,14 @@ public interface RegionScanner extends InternalScanner {
    */
   int getBatch();
 
+  /**
+   * @return The Scanner's {@link org.apache.hadoop.hbase.client.Scan#ID_ATRIBUTE} value,
+   *         or null if not set.
+   */
+  default String getOperationId() {
+    return null;
+  }
+
   /**
    * Grab the next row's worth of values. This is a special internal method to be called from
    * coprocessor hooks to avoid expensive setup. Caller must set the thread's readpoint, start and

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

@@ -89,6 +89,7 @@ class RegionScannerImpl implements RegionScanner, Shipper, RpcCallback {
   private final long maxResultSize;
   private final ScannerContext defaultScannerContext;
   private final FilterWrapper filter;
+  private final String operationId;
 
   private RegionServerServices rsServices;
 
@@ -121,6 +122,7 @@ private static boolean hasNonce(HRegion region, long nonce) {
     defaultScannerContext = ScannerContext.newBuilder().setBatchLimit(scan.getBatch()).build();
     this.stopRow = scan.getStopRow();
     this.includeStopRow = scan.includeStopRow();
+    this.operationId = scan.getId();
 
     // synchronize on scannerReadPoints so that nobody calculates
     // getSmallestReadPoint, before scannerReadPoints is updated.
@@ -215,6 +217,11 @@ public int getBatch() {
     return this.defaultScannerContext.getBatchLimit();
   }
 
+  @Override
+  public String getOperationId() {
+    return operationId;
+  }
+
   /**
    * Reset both the filter and the old filter.
    * @throws IOException in case a filter raises an I/O exception.

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java

@@ -4446,6 +4446,23 @@ public boolean isFamilyEssential(byte[] name) {
     }
   }
 
+  @Test
+  public void testScannerOperationId() throws IOException {
+    region = initHRegion(tableName, method, CONF, COLUMN_FAMILY_BYTES);
+    Scan scan = new Scan();
+    RegionScanner scanner = region.getScanner(scan);
+    assertNull(scanner.getOperationId());
+    scanner.close();
+
+    String operationId = "test_operation_id_0101";
+    scan = new Scan().setId(operationId);
+    scanner = region.getScanner(scan);
+    assertEquals(operationId, scanner.getOperationId());
+    scanner.close();
+
+    HBaseTestingUtil.closeRegionAndWAL(this.region);
+  }
+
   /**
    * Write an HFile block full with Cells whose qualifier that are identical between
    * 0 and Short.MAX_VALUE. See HBASE-13329.