HBASE-28090 Make entryReader field final in ReplicationSourceShipper class (#5409)

Signed-off-by: Wellington Chevreuil <wchevreuil@apache.org>

Author: Apache9

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

@@ -27,8 +27,9 @@
 public class RecoveredReplicationSource extends ReplicationSource {
 
   @Override
-  protected RecoveredReplicationSourceShipper createNewShipper(String walGroupId) {
-    return new RecoveredReplicationSourceShipper(conf, walGroupId, logQueue, this, queueStorage,
+  protected RecoveredReplicationSourceShipper createNewShipper(String walGroupId,
+    ReplicationSourceWALReader walReader) {
+    return new RecoveredReplicationSourceShipper(conf, walGroupId, this, walReader, queueStorage,
       () -> {
         if (workerThreads.isEmpty()) {
           this.getSourceMetrics().clear();

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

@@ -30,9 +30,9 @@ public class RecoveredReplicationSourceShipper extends ReplicationSourceShipper
   private final Runnable tryFinish;
 
   public RecoveredReplicationSourceShipper(Configuration conf, String walGroupId,
-    ReplicationSourceLogQueue logQueue, RecoveredReplicationSource source,
+    RecoveredReplicationSource source, ReplicationSourceWALReader walReader,
     ReplicationQueueStorage queueStorage, Runnable tryFinish) {
-    super(conf, walGroupId, logQueue, source);
+    super(conf, walGroupId, source, walReader);
     this.tryFinish = tryFinish;
   }
 

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

@@ -367,14 +367,13 @@ private void tryStartNewShipper(String walGroupId) {
         return value;
       } else {
         LOG.debug("{} starting shipping worker for walGroupId={}", logPeerId(), walGroupId);
-        ReplicationSourceShipper worker = createNewShipper(walGroupId);
         ReplicationSourceWALReader walReader =
           createNewWALReader(walGroupId, getStartOffset(walGroupId));
+        ReplicationSourceShipper worker = createNewShipper(walGroupId, walReader);
         Threads.setDaemonThreadRunning(
           walReader, Thread.currentThread().getName() + ".replicationSource.wal-reader."
             + walGroupId + "," + queueId,
           (t, e) -> this.uncaughtException(t, e, this.manager, this.getPeerId()));
-        worker.setWALReader(walReader);
         worker.startup((t, e) -> this.uncaughtException(t, e, this.manager, this.getPeerId()));
         return worker;
       }
@@ -428,8 +427,9 @@ private long getFileSize(Path currentPath) throws IOException {
     return fileSize;
   }
 
-  protected ReplicationSourceShipper createNewShipper(String walGroupId) {
-    return new ReplicationSourceShipper(conf, walGroupId, logQueue, this);
+  protected ReplicationSourceShipper createNewShipper(String walGroupId,
+    ReplicationSourceWALReader walReader) {
+    return new ReplicationSourceShipper(conf, walGroupId, this, walReader);
   }
 
   private ReplicationSourceWALReader createNewWALReader(String walGroupId, long startPosition) {
@@ -665,7 +665,7 @@ public void terminate(String reason, Exception cause, boolean clearMetrics) {
     terminate(reason, cause, clearMetrics, true);
   }
 
-  public void terminate(String reason, Exception cause, boolean clearMetrics, boolean join) {
+  private void terminate(String reason, Exception cause, boolean clearMetrics, boolean join) {
     if (cause == null) {
       LOG.info("{} Closing source {} because: {}", logPeerId(), this.queueId, reason);
     } else {
@@ -684,9 +684,7 @@ public void terminate(String reason, Exception cause, boolean clearMetrics, bool
 
     for (ReplicationSourceShipper worker : workers) {
       worker.stopWorker();
-      if (worker.entryReader != null) {
-        worker.entryReader.setReaderRunning(false);
-      }
+      worker.entryReader.setReaderRunning(false);
     }
 
     if (this.replicationEndpoint != null) {

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

@@ -55,9 +55,8 @@ public enum WorkerState {
   }
 
   private final Configuration conf;
-  protected final String walGroupId;
-  protected final ReplicationSourceLogQueue logQueue;
-  protected final ReplicationSource source;
+  final String walGroupId;
+  private final ReplicationSource source;
 
   // Last position in the log that we sent to ZooKeeper
   // It will be accessed by the stats thread so make it volatile
@@ -66,22 +65,22 @@ public enum WorkerState {
   private Path currentPath;
   // Current state of the worker thread
   private volatile WorkerState state;
-  protected ReplicationSourceWALReader entryReader;
+  final ReplicationSourceWALReader entryReader;
 
   // How long should we sleep for each retry
-  protected final long sleepForRetries;
+  private final long sleepForRetries;
   // Maximum number of retries before taking bold actions
-  protected final int maxRetriesMultiplier;
+  private final int maxRetriesMultiplier;
   private final int DEFAULT_TIMEOUT = 20000;
   private final int getEntriesTimeout;
   private final int shipEditsTimeout;
 
-  public ReplicationSourceShipper(Configuration conf, String walGroupId,
-    ReplicationSourceLogQueue logQueue, ReplicationSource source) {
+  public ReplicationSourceShipper(Configuration conf, String walGroupId, ReplicationSource source,
+    ReplicationSourceWALReader walReader) {
     this.conf = conf;
     this.walGroupId = walGroupId;
-    this.logQueue = logQueue;
     this.source = source;
+    this.entryReader = walReader;
     // 1 second
     this.sleepForRetries = this.conf.getLong("replication.source.sleepforretries", 1000);
     // 5 minutes @ 1 sec per
@@ -295,10 +294,6 @@ long getCurrentPosition() {
     return currentPosition;
   }
 
-  void setWALReader(ReplicationSourceWALReader entryReader) {
-    this.entryReader = entryReader;
-  }
-
   protected boolean isActive() {
     return source.isSourceActive() && state == WorkerState.RUNNING && !isInterrupted();
   }

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

@@ -291,8 +291,7 @@ public void testTerminateClearsBuffer() throws Exception {
       mock(MetricsSource.class));
     ReplicationSourceWALReader reader =
       new ReplicationSourceWALReader(null, conf, null, 0, null, source, null);
-    ReplicationSourceShipper shipper = new ReplicationSourceShipper(conf, null, null, source);
-    shipper.entryReader = reader;
+    ReplicationSourceShipper shipper = new ReplicationSourceShipper(conf, null, source, reader);
     source.workerThreads.put("testPeer", shipper);
     WALEntryBatch batch = new WALEntryBatch(10, logDir);
     WAL.Entry mockEntry = mock(WAL.Entry.class);