Revert "HBASE-24813 ReplicationSource should clear buffer usage on Replicatio… (#2191)"

This reverts commit 687e53b7e4.

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

@@ -1,4 +1,4 @@
-/**
+/*
  * 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
@@ -684,12 +684,14 @@ public class ReplicationSource implements ReplicationSourceInterface {
       Threads.shutdown(initThread, this.sleepForRetries);
     }
     Collection<ReplicationSourceShipper> workers = workerThreads.values();
-
     for (ReplicationSourceShipper worker : workers) {
       worker.stopWorker();
-      if (worker.entryReader != null) {
+      if(worker.entryReader != null) {
         worker.entryReader.setReaderRunning(false);
       }
+    }
+
+    for (ReplicationSourceShipper worker : workers) {
       if (worker.isAlive() || worker.entryReader.isAlive()) {
         try {
           // Wait worker to stop
@@ -707,9 +709,6 @@ public class ReplicationSource implements ReplicationSourceInterface {
           worker.entryReader.interrupt();
         }
       }
-      //If worker is already stopped but there was still entries batched,
-      //we need to clear buffer used for non processed entries
-      worker.clearWALEntryBatch();
     }
 
     if (this.replicationEndpoint != null) {

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

@@ -23,8 +23,6 @@ import static org.apache.hadoop.hbase.replication.ReplicationUtils.sleepForRetri
 import java.io.IOException;
 import java.util.List;
 import java.util.concurrent.PriorityBlockingQueue;
-import java.util.concurrent.atomic.LongAccumulator;
-
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hbase.Cell;
@@ -327,53 +325,4 @@ public class ReplicationSourceShipper extends Thread {
   public boolean isFinished() {
     return state == WorkerState.FINISHED;
   }
-
-  /**
-   * Attempts to properly update <code>ReplicationSourceManager.totalBufferUser</code>,
-   * in case there were unprocessed entries batched by the reader to the shipper,
-   * but the shipper didn't manage to ship those because the replication source is being terminated.
-   * In that case, it iterates through the batched entries and decrease the pending
-   * entries size from <code>ReplicationSourceManager.totalBufferUser</code>
-   * <p/>
-   * <b>NOTES</b>
-   * 1) This method should only be called upon replication source termination.
-   * It blocks waiting for both shipper and reader threads termination,
-   * to make sure no race conditions
-   * when updating <code>ReplicationSourceManager.totalBufferUser</code>.
-   *
-   * 2) It <b>does not</b> attempt to terminate reader and shipper threads. Those <b>must</b>
-   * have been triggered interruption/termination prior to calling this method.
-   */
-  void clearWALEntryBatch() {
-    long timeout = System.currentTimeMillis() + this.shipEditsTimeout;
-    while(this.isAlive() || this.entryReader.isAlive()){
-      try {
-        if (System.currentTimeMillis() >= timeout) {
-          LOG.warn("Interrupting source thread for peer {} without cleaning buffer usage "
-            + "because clearWALEntryBatch method timed out whilst waiting reader/shipper "
-            + "thread to stop.", this.source.getPeerId());
-          Thread.currentThread().interrupt();
-        } else {
-          // Wait both shipper and reader threads to stop
-          Thread.sleep(this.sleepForRetries);
-        }
-      } catch (InterruptedException e) {
-        LOG.warn("{} Interrupted while waiting {} to stop on clearWALEntryBatch: {}",
-          this.source.getPeerId(), this.getName(), e);
-        Thread.currentThread().interrupt();
-      }
-    }
-    LongAccumulator totalToDecrement = new LongAccumulator((a,b) -> a + b, 0);
-    entryReader.entryBatchQueue.forEach(w -> {
-      entryReader.entryBatchQueue.remove(w);
-      w.getWalEntries().forEach(e -> {
-        long entrySizeExcludeBulkLoad = entryReader.getEntrySizeExcludeBulkLoad(e);
-        totalToDecrement.accumulate(entrySizeExcludeBulkLoad);
-      });
-    });
-
-    LOG.trace("Decrementing totalBufferUsed by {}B while stopping Replication WAL Readers.",
-      totalToDecrement.longValue());
-    source.getSourceManager().getTotalBufferUsed().addAndGet(-totalToDecrement.longValue());
-  }
 }

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

@@ -60,8 +60,7 @@ class ReplicationSourceWALReader extends Thread {
   private final WALEntryFilter filter;
   private final ReplicationSource source;
 
-  @InterfaceAudience.Private
-  final BlockingQueue<WALEntryBatch> entryBatchQueue;
+  private final BlockingQueue<WALEntryBatch> entryBatchQueue;
   // max (heap) size of each batch - multiply by number of batches in queue to get total
   private final long replicationBatchSizeCapacity;
   // max count of each batch - multiply by number of batches in queue to get total

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

@@ -22,10 +22,7 @@ import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.OptionalLong;
 import java.util.UUID;
 import java.util.concurrent.ExecutorService;
@@ -272,47 +269,6 @@ public class TestReplicationSource {
     }
   }
 
-  @Test
-  public void testTerminateClearsBuffer() throws Exception {
-    ReplicationSource source = new ReplicationSource();
-    ReplicationSourceManager mockManager = mock(ReplicationSourceManager.class);
-    MetricsReplicationGlobalSourceSource mockMetrics =
-      mock(MetricsReplicationGlobalSourceSource.class);
-    AtomicLong buffer = new AtomicLong();
-    Mockito.when(mockManager.getTotalBufferUsed()).thenReturn(buffer);
-    Mockito.when(mockManager.getGlobalMetrics()).thenReturn(mockMetrics);
-    ReplicationPeer mockPeer = mock(ReplicationPeer.class);
-    Mockito.when(mockPeer.getPeerBandwidth()).thenReturn(0L);
-    Configuration testConf = HBaseConfiguration.create();
-    source.init(testConf, null, mockManager, null, mockPeer, null,
-      "testPeer", null, p -> OptionalLong.empty(), mock(MetricsSource.class));
-    ReplicationSourceWALReader reader = new ReplicationSourceWALReader(null,
-      conf, null, 0, null, source);
-    ReplicationSourceShipper shipper =
-      new ReplicationSourceShipper(conf, null, null, source);
-    shipper.entryReader = reader;
-    source.workerThreads.put("testPeer", shipper);
-    WALEntryBatch batch = new WALEntryBatch(10, logDir);
-    WAL.Entry mockEntry = mock(WAL.Entry.class);
-    WALEdit mockEdit = mock(WALEdit.class);
-    WALKeyImpl mockKey = mock(WALKeyImpl.class);
-    when(mockEntry.getEdit()).thenReturn(mockEdit);
-    when(mockEdit.isEmpty()).thenReturn(false);
-    when(mockEntry.getKey()).thenReturn(mockKey);
-    when(mockKey.estimatedSerializedSizeOf()).thenReturn(1000L);
-    when(mockEdit.heapSize()).thenReturn(10000L);
-    when(mockEdit.size()).thenReturn(0);
-    ArrayList<Cell> cells = new ArrayList<>();
-    KeyValue kv = new KeyValue(Bytes.toBytes("0001"), Bytes.toBytes("f"),
-      Bytes.toBytes("1"), Bytes.toBytes("v1"));
-    cells.add(kv);
-    when(mockEdit.getCells()).thenReturn(cells);
-    reader.addEntryToBatch(batch, mockEntry);
-    reader.entryBatchQueue.put(batch);
-    source.terminate("test");
-    assertEquals(0, source.getSourceManager().getTotalBufferUsed().get());
-  }
-
   /**
    * Tests that recovered queues are preserved on a regionserver shutdown.
    * See HBASE-18192
@@ -482,12 +438,12 @@ public class TestReplicationSource {
     ServerName deadServer = ServerName.valueOf("www.deadServer.com", 12006, 1524679704419L);
     PriorityBlockingQueue<Path> queue = new PriorityBlockingQueue<>();
     queue.put(new Path("/www/html/test"));
-    RecoveredReplicationSource source = mock(RecoveredReplicationSource.class);
-    Server server = mock(Server.class);
+    RecoveredReplicationSource source = Mockito.mock(RecoveredReplicationSource.class);
+    Server server = Mockito.mock(Server.class);
     Mockito.when(server.getServerName()).thenReturn(serverName);
     Mockito.when(source.getServer()).thenReturn(server);
     Mockito.when(source.getServerWALsBelongTo()).thenReturn(deadServer);
-    ReplicationQueueStorage storage = mock(ReplicationQueueStorage.class);
+    ReplicationQueueStorage storage = Mockito.mock(ReplicationQueueStorage.class);
     Mockito.when(storage.getWALPosition(Mockito.eq(serverName), Mockito.any(), Mockito.any()))
       .thenReturn(1001L);
     Mockito.when(storage.getWALPosition(Mockito.eq(deadServer), Mockito.any(), Mockito.any()))