HBASE-22881 Fix non-daemon threads in hbase server implementation (#512) (#536)

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

hbase-client/src/test/java/org/apache/hadoop/hbase/client/TestClientNoCluster.java

@@ -807,7 +807,8 @@ public class TestClientNoCluster extends Configured implements Tool {
 
     // Have them all share the same connection so they all share the same instance of
     // ManyServersManyRegionsConnection so I can keep an eye on how many requests by server.
-    final ExecutorService pool = Executors.newCachedThreadPool(Threads.getNamedThreadFactory("p"));
+    final ExecutorService pool = Executors.newCachedThreadPool(
+        Threads.newDaemonThreadFactory("p"));
       // Executors.newFixedThreadPool(servers * 10, Threads.getNamedThreadFactory("p"));
     // Share a connection so I can keep counts in the 'server' on concurrency.
     final Connection sharedConnection = ConnectionFactory.createConnection(getConf()/*, pool*/);

hbase-common/src/main/java/org/apache/hadoop/hbase/util/Threads.java

@@ -204,7 +204,7 @@ public class Threads {
    * @param prefix The prefix of every created Thread's name
    * @return a {@link java.util.concurrent.ThreadFactory} that names threads
    */
-  public static ThreadFactory getNamedThreadFactory(final String prefix) {
+  private static ThreadFactory getNamedThreadFactory(final String prefix) {
     SecurityManager s = System.getSecurityManager();
     final ThreadGroup threadGroup = (s != null) ? s.getThreadGroup() : Thread.currentThread()
         .getThreadGroup();

hbase-server/src/main/java/org/apache/hadoop/hbase/backup/HFileArchiver.java

@@ -226,7 +226,9 @@ public class HFileArchiver {
       @Override
       public Thread newThread(Runnable r) {
         final String name = "HFileArchiver-" + threadNumber.getAndIncrement();
-        return new Thread(r, name);
+        Thread t = new Thread(r, name);
+        t.setDaemon(true);
+        return t;
       }
     };
   }

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

@@ -23,21 +23,21 @@ import java.util.List;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.SynchronousQueue;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.hbase.TableName;
-import org.apache.yetus.audience.InterfaceAudience;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
 import org.apache.hadoop.hbase.master.locking.LockManager;
 import org.apache.hadoop.hbase.mob.MobUtils;
 import org.apache.hadoop.hbase.procedure2.LockType;
 import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 /**
  * The mob compaction thread used in {@link MasterRpcServices}
@@ -55,14 +55,11 @@ public class MasterMobCompactionThread {
     this.conf = master.getConfiguration();
     final String n = Thread.currentThread().getName();
     // this pool is used to run the mob compaction
-    this.masterMobPool = new ThreadPoolExecutor(1, 2, 60, TimeUnit.SECONDS,
+    this.masterMobPool = new ThreadPoolExecutor(1, 2, 60,
-      new SynchronousQueue<>(), new ThreadFactory() {
+        TimeUnit.SECONDS, new SynchronousQueue<>(),
-        @Override
+        new ThreadFactoryBuilder().setDaemon(true)
-        public Thread newThread(Runnable r) {
+            .setNameFormat(n + "-MasterMobCompaction-" + EnvironmentEdgeManager.currentTime())
-          String name = n + "-MasterMobCompaction-" + EnvironmentEdgeManager.currentTime();
+            .build());
-          return new Thread(r, name);
-        }
-      });
     ((ThreadPoolExecutor) this.masterMobPool).allowCoreThreadTimeOut(true);
     // this pool is used in the mob compaction to compact the mob files by partitions
     // in parallel

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

@@ -675,7 +675,7 @@ public class SplitTableRegionProcedure
     LOG.info("pid=" + getProcId() + " splitting " + nbFiles + " storefiles, region=" +
         getParentRegion().getShortNameToLog() + ", threads=" + maxThreads);
     final ExecutorService threadPool = Executors.newFixedThreadPool(maxThreads,
-      Threads.getNamedThreadFactory("StoreFileSplitter-%1$d"));
+      Threads.newDaemonThreadFactory("StoreFileSplitter-%1$d"));
     final List<Future<Pair<Path, Path>>> futures = new ArrayList<Future<Pair<Path, Path>>>(nbFiles);
 
     // Split each store file.

hbase-server/src/main/java/org/apache/hadoop/hbase/procedure/flush/RegionServerFlushTableProcedureManager.java

@@ -25,11 +25,9 @@ import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorCompletionService;
 import java.util.concurrent.Future;
-import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
-import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.Abortable;
 import org.apache.hadoop.hbase.DaemonThreadFactory;
@@ -47,7 +45,9 @@ import org.apache.hadoop.hbase.procedure.ZKProcedureMemberRpcs;
 import org.apache.hadoop.hbase.regionserver.HRegion;
 import org.apache.hadoop.hbase.regionserver.HRegionServer;
 import org.apache.hadoop.hbase.regionserver.RegionServerServices;
+import org.apache.hadoop.hbase.util.Threads;
 import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
+import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.zookeeper.KeeperException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -213,10 +213,8 @@ public class RegionServerFlushTableProcedureManager extends RegionServerProcedur
         RegionServerFlushTableProcedureManager.FLUSH_TIMEOUT_MILLIS_DEFAULT);
       int threads = conf.getInt(CONCURENT_FLUSH_TASKS_KEY, DEFAULT_CONCURRENT_FLUSH_TASKS);
       this.name = name;
-      executor = new ThreadPoolExecutor(threads, threads, keepAlive, TimeUnit.MILLISECONDS,
+      executor = Threads.getBoundedCachedThreadPool(threads, keepAlive, TimeUnit.MILLISECONDS,
-          new LinkedBlockingQueue<>(), new DaemonThreadFactory("rs("
+          new DaemonThreadFactory("rs(" + name + ")-flush-proc-pool-"));
-              + name + ")-flush-proc-pool"));
-      executor.allowCoreThreadTimeOut(true);
       taskPool = new ExecutorCompletionService<>(executor);
     }
 

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

@@ -31,7 +31,6 @@ import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.Executors;
 import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -56,8 +55,10 @@ import org.apache.hadoop.util.StringUtils;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+
 import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
 import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;
+import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 /**
  * Compact region on request and then run split if appropriate
@@ -118,14 +119,9 @@ public class CompactSplit implements CompactionRequester, PropagatingConfigurati
   private void createSplitExcecutors() {
     final String n = Thread.currentThread().getName();
     int splitThreads = conf.getInt(SPLIT_THREADS, SPLIT_THREADS_DEFAULT);
-    this.splits =
+    this.splits = (ThreadPoolExecutor) Executors.newFixedThreadPool(splitThreads,
-        (ThreadPoolExecutor) Executors.newFixedThreadPool(splitThreads, new ThreadFactory() {
+            new ThreadFactoryBuilder().setNameFormat(n + "-splits-" + System.currentTimeMillis())
-          @Override
+                .setDaemon(true).build());
-          public Thread newThread(Runnable r) {
-            String name = n + "-splits-" + System.currentTimeMillis();
-            return new Thread(r, name);
-          }
-        });
   }
 
   private void createCompactionExecutors() {
@@ -144,24 +140,16 @@ public class CompactSplit implements CompactionRequester, PropagatingConfigurati
     StealJobQueue<Runnable> stealJobQueue = new StealJobQueue<Runnable>(COMPARATOR);
     this.longCompactions = new ThreadPoolExecutor(largeThreads, largeThreads, 60,
         TimeUnit.SECONDS, stealJobQueue,
-        new ThreadFactory() {
+        new ThreadFactoryBuilder()
-          @Override
+            .setNameFormat(n + "-longCompactions-" + System.currentTimeMillis())
-          public Thread newThread(Runnable r) {
+            .setDaemon(true).build());
-            String name = n + "-longCompactions-" + System.currentTimeMillis();
-            return new Thread(r, name);
-          }
-        });
     this.longCompactions.setRejectedExecutionHandler(new Rejection());
     this.longCompactions.prestartAllCoreThreads();
     this.shortCompactions = new ThreadPoolExecutor(smallThreads, smallThreads, 60,
         TimeUnit.SECONDS, stealJobQueue.getStealFromQueue(),
-        new ThreadFactory() {
+        new ThreadFactoryBuilder()
-          @Override
+            .setNameFormat(n + "-shortCompactions-" + System.currentTimeMillis())
-          public Thread newThread(Runnable r) {
+            .setDaemon(true).build());
-            String name = n + "-shortCompactions-" + System.currentTimeMillis();
-            return new Thread(r, name);
-          }
-        });
     this.shortCompactions.setRejectedExecutionHandler(new Rejection());
   }
 

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

@@ -26,7 +26,6 @@ import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorCompletionService;
 import java.util.concurrent.Future;
-import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
@@ -36,6 +35,7 @@ import org.apache.hadoop.hbase.DaemonThreadFactory;
 import org.apache.hadoop.hbase.DroppedSnapshotException;
 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.util.Threads;
 import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.yetus.audience.InterfaceStability;
@@ -283,10 +283,8 @@ public class RegionServerSnapshotManager extends RegionServerProcedureManager {
         RegionServerSnapshotManager.SNAPSHOT_TIMEOUT_MILLIS_DEFAULT);
       int threads = conf.getInt(CONCURENT_SNAPSHOT_TASKS_KEY, DEFAULT_CONCURRENT_SNAPSHOT_TASKS);
       this.name = name;
-      executor = new ThreadPoolExecutor(threads, threads, keepAlive, TimeUnit.MILLISECONDS,
+      executor = Threads.getBoundedCachedThreadPool(threads, keepAlive, TimeUnit.MILLISECONDS,
-          new LinkedBlockingQueue<>(), new DaemonThreadFactory("rs("
+          new DaemonThreadFactory("rs(" + name + ")-snapshot-pool-"));
-              + name + ")-snapshot-pool"));
-      executor.allowCoreThreadTimeOut(true);
       taskPool = new ExecutorCompletionService<>(executor);
     }
 

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

@@ -227,7 +227,8 @@ public class FSHLog extends AbstractFSWAL<Writer> {
     // Using BlockingWaitStrategy. Stuff that is going on here takes so long it makes no sense
     // spinning as other strategies do.
     this.disruptor = new Disruptor<>(RingBufferTruck::new,
-        getPreallocatedEventCount(), Threads.getNamedThreadFactory(hostingThreadName + ".append"),
+        getPreallocatedEventCount(),
+        Threads.newDaemonThreadFactory(hostingThreadName + ".append"),
         ProducerType.MULTI, new BlockingWaitStrategy());
     // Advance the ring buffer sequence so that it starts from 1 instead of 0,
     // because SyncFuture.NOT_DONE = 0.

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

@@ -32,7 +32,6 @@ import java.util.concurrent.CompletionService;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorCompletionService;
 import java.util.concurrent.Future;
-import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.regex.Matcher;
@@ -57,6 +56,7 @@ import org.apache.hadoop.hbase.replication.HBaseReplicationEndpoint;
 import org.apache.hadoop.hbase.replication.regionserver.ReplicationSinkManager.SinkPeer;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.FSUtils;
+import org.apache.hadoop.hbase.util.Threads;
 import org.apache.hadoop.hbase.wal.WAL.Entry;
 import org.apache.hadoop.ipc.RemoteException;
 import org.apache.yetus.audience.InterfaceAudience;
@@ -64,6 +64,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
+import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos.AdminService.BlockingInterface;
 
@@ -141,9 +142,8 @@ public class HBaseInterClusterReplicationEndpoint extends HBaseReplicationEndpoi
     // per sink thread pool
     this.maxThreads = this.conf.getInt(HConstants.REPLICATION_SOURCE_MAXTHREADS_KEY,
       HConstants.REPLICATION_SOURCE_MAXTHREADS_DEFAULT);
-    this.exec = new ThreadPoolExecutor(maxThreads, maxThreads, 60, TimeUnit.SECONDS,
+    this.exec = Threads.getBoundedCachedThreadPool(maxThreads, 60, TimeUnit.SECONDS,
-        new LinkedBlockingQueue<>());
+        new ThreadFactoryBuilder().setDaemon(true).setNameFormat("SinkThread-%d").build());
-    this.exec.allowCoreThreadTimeOut(true);
     this.abortable = ctx.getAbortable();
     // Set the size limit for replication RPCs to 95% of the max request size.
     // We could do with less slop if we have an accurate estimate of encoded size. Being

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

@@ -10,8 +10,6 @@
  */
 package org.apache.hadoop.hbase.replication.regionserver;
 
-import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
-
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InterruptedIOException;
@@ -27,7 +25,6 @@ import java.util.Map.Entry;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
-import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
@@ -39,9 +36,6 @@ import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hbase.HBaseConfiguration;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.TableName;
-import org.apache.yetus.audience.InterfaceAudience;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.RegionLocator;
 import org.apache.hadoop.hbase.client.Table;
@@ -53,6 +47,12 @@ import org.apache.hadoop.hbase.security.token.FsDelegationToken;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.FSUtils;
 import org.apache.hadoop.hbase.util.Pair;
+import org.apache.hadoop.hbase.util.Threads;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 /**
  * It is used for replicating HFile entries. It will first copy parallely all the hfiles to a local
@@ -105,12 +105,9 @@ public class HFileReplicator {
     this.maxCopyThreads =
         this.conf.getInt(REPLICATION_BULKLOAD_COPY_MAXTHREADS_KEY,
           REPLICATION_BULKLOAD_COPY_MAXTHREADS_DEFAULT);
-    ThreadFactoryBuilder builder = new ThreadFactoryBuilder();
+    this.exec = Threads.getBoundedCachedThreadPool(maxCopyThreads, 60, TimeUnit.SECONDS,
-    builder.setNameFormat("HFileReplicationCallable-%1$d");
+        new ThreadFactoryBuilder().setDaemon(true)
-    this.exec =
+            .setNameFormat("HFileReplicationCallable-%1$d").build());
-        new ThreadPoolExecutor(maxCopyThreads, maxCopyThreads, 60, TimeUnit.SECONDS,
-            new LinkedBlockingQueue<>(), builder.build());
-    this.exec.allowCoreThreadTimeOut(true);
     this.copiesPerThread =
         conf.getInt(REPLICATION_BULKLOAD_COPY_HFILES_PERTHREAD_KEY,
           REPLICATION_BULKLOAD_COPY_HFILES_PERTHREAD_DEFAULT);

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

@@ -196,8 +196,8 @@ public class ReplicationSourceManager implements ReplicationListener {
     int nbWorkers = conf.getInt("replication.executor.workers", 1);
     // use a short 100ms sleep since this could be done inline with a RS startup
     // even if we fail, other region servers can take care of it
-    this.executor = new ThreadPoolExecutor(nbWorkers, nbWorkers, 100, TimeUnit.MILLISECONDS,
+    this.executor = new ThreadPoolExecutor(nbWorkers, nbWorkers, 100,
-        new LinkedBlockingQueue<>());
+        TimeUnit.MILLISECONDS, new LinkedBlockingQueue<>());
     ThreadFactoryBuilder tfb = new ThreadFactoryBuilder();
     tfb.setNameFormat("ReplicationExecutor-%d");
     tfb.setDaemon(true);

hbase-server/src/main/java/org/apache/hadoop/hbase/snapshot/SnapshotManifest.java

@@ -571,7 +571,7 @@ public final class SnapshotManifest {
   public static ThreadPoolExecutor createExecutor(final Configuration conf, final String name) {
     int maxThreads = conf.getInt("hbase.snapshot.thread.pool.max", 8);
     return Threads.getBoundedCachedThreadPool(maxThreads, 30L, TimeUnit.SECONDS,
-              Threads.getNamedThreadFactory(name));
+              Threads.newDaemonThreadFactory(name));
   }
 
   /**

hbase-server/src/main/java/org/apache/hadoop/hbase/tool/HFileContentValidator.java

@@ -108,7 +108,7 @@ public class HFileContentValidator extends AbstractHBaseTool {
     int availableProcessors = Runtime.getRuntime().availableProcessors();
     int numThreads = conf.getInt("hfilevalidator.numthreads", availableProcessors);
     return Executors.newFixedThreadPool(numThreads,
-        Threads.getNamedThreadFactory("hfile-validator"));
+        Threads.newDaemonThreadFactory("hfile-validator"));
   }
 
   @Override

hbase-server/src/main/java/org/apache/hadoop/hbase/util/FSUtils.java

@@ -1623,7 +1623,8 @@ public abstract class FSUtils extends CommonFSUtils {
     // run in multiple threads
     ThreadPoolExecutor tpe = new ThreadPoolExecutor(threadPoolSize,
         threadPoolSize, 60, TimeUnit.SECONDS,
-        new ArrayBlockingQueue<>(statusList.length));
+        new ArrayBlockingQueue<>(statusList.length),
+        Threads.newDaemonThreadFactory("FSRegionQuery"));
     try {
       // ignore all file status items that are not of interest
       for (FileStatus regionStatus : statusList) {

hbase-server/src/main/java/org/apache/hadoop/hbase/util/ModifyRegionUtils.java

@@ -28,7 +28,6 @@ import java.util.concurrent.Callable;
 import java.util.concurrent.CompletionService;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorCompletionService;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
@@ -235,14 +234,7 @@ public abstract class ModifyRegionUtils {
         "hbase.hregion.open.and.init.threads.max", 16));
     ThreadPoolExecutor regionOpenAndInitThreadPool = Threads
     .getBoundedCachedThreadPool(maxThreads, 30L, TimeUnit.SECONDS,
-        new ThreadFactory() {
+        Threads.newDaemonThreadFactory(threadNamePrefix));
-          private int count = 1;
-
-          @Override
-          public Thread newThread(Runnable r) {
-            return new Thread(r, threadNamePrefix + "-" + count++);
-          }
-        });
     return regionOpenAndInitThreadPool;
   }
 }

hbase-server/src/test/java/org/apache/hadoop/hbase/procedure/SimpleRSProcedureManager.java

@@ -124,9 +124,9 @@ public class SimpleRSProcedureManager extends RegionServerProcedureManager {
 
     public SimpleSubprocedurePool(String name, Configuration conf) {
       this.name = name;
-      executor = new ThreadPoolExecutor(1, 1, 500, TimeUnit.SECONDS,
+      executor = new ThreadPoolExecutor(1, 1, 500,
-          new LinkedBlockingQueue<>(),
+          TimeUnit.SECONDS, new LinkedBlockingQueue<>(),
-          new DaemonThreadFactory("rs(" + name + ")-procedure-pool"));
+          new DaemonThreadFactory("rs(" + name + ")-procedure-pool-"));
       taskPool = new ExecutorCompletionService<>(executor);
     }
 

hbase-thrift/src/main/java/org/apache/hadoop/hbase/thrift/IncrementCoalescer.java

@@ -26,10 +26,8 @@ import java.util.concurrent.Callable;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.LinkedBlockingQueue;
-import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
-import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.LongAdder;
 import org.apache.hadoop.hbase.CellUtil;
 import org.apache.hadoop.hbase.client.Table;
@@ -130,27 +128,6 @@ public class IncrementCoalescer implements IncrementCoalescerMBean {
 
   }
 
-  static class DaemonThreadFactory implements ThreadFactory {
-    static final AtomicInteger poolNumber = new AtomicInteger(1);
-    final ThreadGroup group;
-    final AtomicInteger threadNumber = new AtomicInteger(1);
-    final String namePrefix;
-
-    DaemonThreadFactory() {
-      SecurityManager s = System.getSecurityManager();
-      group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
-      namePrefix = "ICV-" + poolNumber.getAndIncrement() + "-thread-";
-    }
-
-    @Override
-    public Thread newThread(Runnable r) {
-      Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
-      if (!t.isDaemon()) t.setDaemon(true);
-      if (t.getPriority() != Thread.NORM_PRIORITY) t.setPriority(Thread.NORM_PRIORITY);
-      return t;
-    }
-  }
-
   private final LongAdder failedIncrements = new LongAdder();
   private final LongAdder successfulCoalescings = new LongAdder();
   private final LongAdder totalIncrements = new LongAdder();
@@ -168,10 +145,9 @@ public class IncrementCoalescer implements IncrementCoalescerMBean {
   public IncrementCoalescer(ThriftHBaseServiceHandler hand) {
     this.handler = hand;
     LinkedBlockingQueue<Runnable> queue = new LinkedBlockingQueue<>();
-    pool =
+    pool = new ThreadPoolExecutor(CORE_POOL_SIZE, CORE_POOL_SIZE, 50,
-        new ThreadPoolExecutor(CORE_POOL_SIZE, CORE_POOL_SIZE, 50, TimeUnit.MILLISECONDS, queue,
+        TimeUnit.MILLISECONDS, queue,
-            Threads.newDaemonThreadFactory("IncrementCoalescer"));
+        Threads.newDaemonThreadFactory("IncrementCoalescer"));
-
     MBeans.register("thrift", "Thrift", this);
   }