HDFS-16553. Fix checkstyle for the length of BlockManager construction method over limit. (#4211). Contributed by Chengwei Wang.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java

@@ -485,72 +485,54 @@ public class BlockManager implements BlockStatsMXBean {
   public BlockManager(final Namesystem namesystem, boolean haEnabled,
       final Configuration conf) throws IOException {
     this.namesystem = namesystem;
-    datanodeManager = new DatanodeManager(this, namesystem, conf);
-    heartbeatManager = datanodeManager.getHeartbeatManager();
+    this.datanodeManager = new DatanodeManager(this, namesystem, conf);
+    this.heartbeatManager = datanodeManager.getHeartbeatManager();
     this.blockIdManager = new BlockIdManager(this);
-    blocksPerPostpondedRescan = (int)Math.min(Integer.MAX_VALUE,
+    this.blocksPerPostpondedRescan = (int)Math.min(Integer.MAX_VALUE,
         datanodeManager.getBlocksPerPostponedMisreplicatedBlocksRescan());
-    rescannedMisreplicatedBlocks =
+    this.rescannedMisreplicatedBlocks =
         new ArrayList<Block>(blocksPerPostpondedRescan);
-    startupDelayBlockDeletionInMs = conf.getLong(
+    this.startupDelayBlockDeletionInMs = conf.getLong(
         DFSConfigKeys.DFS_NAMENODE_STARTUP_DELAY_BLOCK_DELETION_SEC_KEY,
-        DFSConfigKeys.DFS_NAMENODE_STARTUP_DELAY_BLOCK_DELETION_SEC_DEFAULT) * 1000L;
-    deleteBlockLockTimeMs = conf.getLong(
+        DFSConfigKeys.DFS_NAMENODE_STARTUP_DELAY_BLOCK_DELETION_SEC_DEFAULT)
+        * 1000L;
+    this.deleteBlockLockTimeMs = conf.getLong(
         DFSConfigKeys.DFS_NAMENODE_BLOCK_DELETION_LOCK_THRESHOLD_MS,
         DFSConfigKeys.DFS_NAMENODE_BLOCK_DELETION_LOCK_THRESHOLD_MS_DEFAULT);
-    deleteBlockUnlockIntervalTimeMs = conf.getLong(
+    this.deleteBlockUnlockIntervalTimeMs = conf.getLong(
         DFSConfigKeys.DFS_NAMENODE_BLOCK_DELETION_UNLOCK_INTERVAL_MS,
         DFSConfigKeys.DFS_NAMENODE_BLOCK_DELETION_UNLOCK_INTERVAL_MS_DEFAULT);
-    invalidateBlocks = new InvalidateBlocks(
+    this.invalidateBlocks = new InvalidateBlocks(
         datanodeManager.getBlockInvalidateLimit(),
         startupDelayBlockDeletionInMs,
         blockIdManager);
-    markedDeleteQueue = new ConcurrentLinkedQueue<>();
+    this.markedDeleteQueue = new ConcurrentLinkedQueue<>();
     // Compute the map capacity by allocating 2% of total memory
-    blocksMap = new BlocksMap(
+    this.blocksMap = new BlocksMap(
         LightWeightGSet.computeCapacity(2.0, "BlocksMap"));
-    placementPolicies = new BlockPlacementPolicies(
-      conf, datanodeManager.getFSClusterStats(),
-      datanodeManager.getNetworkTopology(),
-      datanodeManager.getHost2DatanodeMap());
-    storagePolicySuite = BlockStoragePolicySuite.createDefaultSuite(conf);
-    pendingReconstruction = new PendingReconstructionBlocks(conf.getInt(
+    this.placementPolicies = new BlockPlacementPolicies(
+        conf, datanodeManager.getFSClusterStats(),
+        datanodeManager.getNetworkTopology(),
+        datanodeManager.getHost2DatanodeMap());
+    this.storagePolicySuite = BlockStoragePolicySuite.createDefaultSuite(conf);
+    this.pendingReconstruction = new PendingReconstructionBlocks(conf.getInt(
         DFSConfigKeys.DFS_NAMENODE_RECONSTRUCTION_PENDING_TIMEOUT_SEC_KEY,
         DFSConfigKeys.DFS_NAMENODE_RECONSTRUCTION_PENDING_TIMEOUT_SEC_DEFAULT)
         * 1000L);
 
     createSPSManager(conf);
 
-    blockTokenSecretManager = createBlockTokenSecretManager(conf);
-
-    providedStorageMap = new ProvidedStorageMap(namesystem, this, conf);
+    this.blockTokenSecretManager = createBlockTokenSecretManager(conf);
+    this.providedStorageMap = new ProvidedStorageMap(namesystem, this, conf);
 
     this.maxCorruptFilesReturned = conf.getInt(
-      DFSConfigKeys.DFS_DEFAULT_MAX_CORRUPT_FILES_RETURNED_KEY,
-      DFSConfigKeys.DFS_DEFAULT_MAX_CORRUPT_FILES_RETURNED);
+        DFSConfigKeys.DFS_DEFAULT_MAX_CORRUPT_FILES_RETURNED_KEY,
+        DFSConfigKeys.DFS_DEFAULT_MAX_CORRUPT_FILES_RETURNED);
     this.defaultReplication = conf.getInt(DFSConfigKeys.DFS_REPLICATION_KEY,
         DFSConfigKeys.DFS_REPLICATION_DEFAULT);
 
-    final int maxR = conf.getInt(DFSConfigKeys.DFS_REPLICATION_MAX_KEY,
-        DFSConfigKeys.DFS_REPLICATION_MAX_DEFAULT);
-    final int minR = conf.getInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY,
-        DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_DEFAULT);
-    if (minR <= 0)
-      throw new IOException("Unexpected configuration parameters: "
-          + DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY
-          + " = " + minR + " <= 0");
-    if (maxR > Short.MAX_VALUE)
-      throw new IOException("Unexpected configuration parameters: "
-          + DFSConfigKeys.DFS_REPLICATION_MAX_KEY
-          + " = " + maxR + " > " + Short.MAX_VALUE);
-    if (minR > maxR)
-      throw new IOException("Unexpected configuration parameters: "
-          + DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY
-          + " = " + minR + " > "
-          + DFSConfigKeys.DFS_REPLICATION_MAX_KEY
-          + " = " + maxR);
-    this.minReplication = (short)minR;
-    this.maxReplication = (short)maxR;
+    this.minReplication = (short) initMinReplication(conf);
+    this.maxReplication = (short) initMaxReplication(conf);
 
     this.maxReplicationStreams =
         conf.getInt(DFSConfigKeys.DFS_NAMENODE_REPLICATION_MAX_STREAMS_KEY,
@@ -582,6 +564,66 @@ public class BlockManager implements BlockStatsMXBean {
         DFSConfigKeys.DFS_BLOCK_MISREPLICATION_PROCESSING_LIMIT,
         DFSConfigKeys.DFS_BLOCK_MISREPLICATION_PROCESSING_LIMIT_DEFAULT);
 
+    this.minReplicationToBeInMaintenance =
+        (short) initMinReplicationToBeInMaintenance(conf);
+    this.replQueueResetToHeadThreshold =
+        initReplQueueResetToHeadThreshold(conf);
+
+    long heartbeatIntervalSecs = conf.getTimeDuration(
+        DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY,
+        DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_DEFAULT, TimeUnit.SECONDS);
+    long blockRecoveryTimeout = getBlockRecoveryTimeout(heartbeatIntervalSecs);
+    this.pendingRecoveryBlocks = new PendingRecoveryBlocks(blockRecoveryTimeout);
+
+    this.blockReportLeaseManager = new BlockReportLeaseManager(conf);
+
+    this.bmSafeMode = new BlockManagerSafeMode(this, namesystem, haEnabled,
+        conf);
+
+    int queueSize = conf.getInt(
+        DFSConfigKeys.DFS_NAMENODE_BLOCKREPORT_QUEUE_SIZE_KEY,
+        DFSConfigKeys.DFS_NAMENODE_BLOCKREPORT_QUEUE_SIZE_DEFAULT);
+    this.blockReportThread = new BlockReportProcessingThread(queueSize);
+
+    this.deleteCorruptReplicaImmediately =
+        conf.getBoolean(DFS_NAMENODE_CORRUPT_BLOCK_DELETE_IMMEDIATELY_ENABLED,
+            DFS_NAMENODE_CORRUPT_BLOCK_DELETE_IMMEDIATELY_ENABLED_DEFAULT);
+
+    printInitialConfigs();
+  }
+
+  private int initMinReplication(Configuration conf) throws IOException {
+    final int minR = conf.getInt(
+        DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY,
+        DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_DEFAULT);
+    if (minR <= 0) {
+      throw new IOException("Unexpected configuration parameters: "
+          + DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY
+          + " = " + minR + " <= 0");
+    }
+    return minR;
+  }
+
+  private int initMaxReplication(Configuration conf) throws IOException {
+    final int maxR = conf.getInt(DFSConfigKeys.DFS_REPLICATION_MAX_KEY,
+        DFSConfigKeys.DFS_REPLICATION_MAX_DEFAULT);
+    if (maxR > Short.MAX_VALUE) {
+      throw new IOException("Unexpected configuration parameters: "
+          + DFSConfigKeys.DFS_REPLICATION_MAX_KEY
+          + " = " + maxR + " > " + Short.MAX_VALUE);
+    }
+    if (minReplication > maxR) {
+      throw new IOException("Unexpected configuration parameters: "
+          + DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY
+          + " = " + minReplication + " > "
+          + DFSConfigKeys.DFS_REPLICATION_MAX_KEY
+          + " = " + maxR);
+    }
+    return maxR;
+  }
+
+  private int initMinReplicationToBeInMaintenance(Configuration conf)
+      throws IOException {
     final int minMaintenanceR = conf.getInt(
         DFSConfigKeys.DFS_NAMENODE_MAINTENANCE_REPLICATION_MIN_KEY,
         DFSConfigKeys.DFS_NAMENODE_MAINTENANCE_REPLICATION_MIN_DEFAULT);
@@ -598,39 +640,25 @@ public class BlockManager implements BlockStatsMXBean {
           + DFSConfigKeys.DFS_REPLICATION_KEY
           + " = " + defaultReplication);
     }
-    this.minReplicationToBeInMaintenance = (short)minMaintenanceR;
+    return minMaintenanceR;
+  }
 
-    replQueueResetToHeadThreshold = conf.getInt(
+  private int initReplQueueResetToHeadThreshold(Configuration conf) {
+    int threshold = conf.getInt(
         DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_QUEUE_RESTART_ITERATIONS,
         DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_QUEUE_RESTART_ITERATIONS_DEFAULT);
-    if (replQueueResetToHeadThreshold < 0) {
+    if (threshold < 0) {
       LOG.warn("{} is set to {} and it must be >= 0. Resetting to default {}",
           DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_QUEUE_RESTART_ITERATIONS,
-          replQueueResetToHeadThreshold, DFSConfigKeys.
+          threshold, DFSConfigKeys.
               DFS_NAMENODE_REDUNDANCY_QUEUE_RESTART_ITERATIONS_DEFAULT);
-      replQueueResetToHeadThreshold = DFSConfigKeys.
+      threshold = DFSConfigKeys.
           DFS_NAMENODE_REDUNDANCY_QUEUE_RESTART_ITERATIONS_DEFAULT;
     }
+    return threshold;
+  }
 
-    long heartbeatIntervalSecs = conf.getTimeDuration(
-        DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_KEY,
-        DFSConfigKeys.DFS_HEARTBEAT_INTERVAL_DEFAULT, TimeUnit.SECONDS);
-    long blockRecoveryTimeout = getBlockRecoveryTimeout(heartbeatIntervalSecs);
-    pendingRecoveryBlocks = new PendingRecoveryBlocks(blockRecoveryTimeout);
-
-    this.blockReportLeaseManager = new BlockReportLeaseManager(conf);
-
-    bmSafeMode = new BlockManagerSafeMode(this, namesystem, haEnabled, conf);
-
-    int queueSize = conf.getInt(
-        DFSConfigKeys.DFS_NAMENODE_BLOCKREPORT_QUEUE_SIZE_KEY,
-        DFSConfigKeys.DFS_NAMENODE_BLOCKREPORT_QUEUE_SIZE_DEFAULT);
-    blockReportThread = new BlockReportProcessingThread(queueSize);
-
-    this.deleteCorruptReplicaImmediately =
-        conf.getBoolean(DFS_NAMENODE_CORRUPT_BLOCK_DELETE_IMMEDIATELY_ENABLED,
-            DFS_NAMENODE_CORRUPT_BLOCK_DELETE_IMMEDIATELY_ENABLED_DEFAULT);
-
+  private void printInitialConfigs() {
     LOG.info("defaultReplication         = {}", defaultReplication);
     LOG.info("maxReplication             = {}", maxReplication);
     LOG.info("minReplication             = {}", minReplication);