HBASE-26525 Use unique thread name for group WALs

Author: sunhelly

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

@@ -237,8 +237,8 @@ public AsyncFSWAL(FileSystem fs, Abortable abortable, Path rootDir, String logDi
       ThreadPoolExecutor threadPool =
         new ThreadPoolExecutor(1, 1, 0L,
           TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(),
-            new ThreadFactoryBuilder().setNameFormat("AsyncFSWAL-%d-" + rootDir.toString()).
-              setDaemon(true).build());
+          new ThreadFactoryBuilder().setNameFormat("AsyncFSWAL-%d-prefix:" +
+            (prefix == null ? "default" : prefix)).setDaemon(true).build());
       hasConsumerTask = () -> threadPool.getQueue().peek() == consumer;
       this.consumeExecutor = threadPool;
     }