HBASE-26114 when “hbase.mob.compaction.threads.max” is set to a negative number, HMaster cannot start normally (#3541)

Signed-off-by: Anoop <[email protected]>

Author: liever18

hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobUtils.java

@@ -863,7 +863,8 @@ public static void doMobCompaction(Configuration conf, FileSystem fs, TableName
   public static ExecutorService createMobCompactorThreadPool(Configuration conf) {
     int maxThreads = conf.getInt(MobConstants.MOB_COMPACTION_THREADS_MAX,
         MobConstants.DEFAULT_MOB_COMPACTION_THREADS_MAX);
-    if (maxThreads == 0) {
+    // resets to default mob compaction thread number when the user sets this value incorrectly      
+    if (maxThreads <= 0) {
       maxThreads = 1;
     }
     final SynchronousQueue<Runnable> queue = new SynchronousQueue<>();