HBASE-21257 misspelled words.[occured -> occurred]

hbase-it/src/test/java/org/apache/hadoop/hbase/chaos/util/Monkeys.java

@@ -55,7 +55,7 @@ public Monkeys(Configuration conf) {
       try {
         monkeyRunner.getAndStartMonkey();
       } catch (Exception e) {
-        LOG.error("Exception occured when running chaos monkeys: ", e);
+        LOG.error("Exception occurred when running chaos monkeys: ", e);
       }
     };
     this.executor = Executors.newSingleThreadExecutor(new ThreadFactoryBuilder()
@@ -91,7 +91,7 @@ public void close() throws IOException {
       executor.awaitTermination(10, TimeUnit.SECONDS);
     } catch (InterruptedException e) {
       Thread.currentThread().interrupt();
-      LOG.warn("Interruption occured while stopping chaos monkeys " + e);
+      LOG.warn("Interruption occurred while stopping chaos monkeys " + e);
     }
   }
 }

hbase-rest/src/main/java/org/apache/hadoop/hbase/rest/ScannerResource.java

@@ -112,7 +112,7 @@ Response update(final ScannerModel model, final boolean replace,
       servlet.getMetrics().incrementSucessfulPutRequests(1);
       return Response.created(uri).build();
     } catch (Exception e) {
-      LOG.error("Exception occured while processing " + uriInfo.getAbsolutePath() + " : ", e);
+      LOG.error("Exception occurred while processing " + uriInfo.getAbsolutePath() + " : ", e);
       servlet.getMetrics().incrementFailedPutRequests(1);
       if (e instanceof TableNotFoundException) {
         return Response.status(Response.Status.NOT_FOUND)

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

@@ -152,7 +152,7 @@ public void process() throws IOException {
 
   @Override
   protected void handleException(Throwable t) {
-    LOG.warn("Fatal error occured while opening region {}, aborting...",
+    LOG.warn("Fatal error occurred while opening region {}, aborting...",
       regionInfo.getRegionNameAsString(), t);
     getServer().abort(
       "Failed to open region " + regionInfo.getRegionNameAsString() + " and can not recover", t);

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

@@ -130,7 +130,7 @@ public void process() throws IOException {
 
   @Override
   protected void handleException(Throwable t) {
-    LOG.warn("Fatal error occured while closing region {}, aborting...", encodedName, t);
+    LOG.warn("Fatal error occurred while closing region {}, aborting...", encodedName, t);
     getServer().abort("Failed to close region " + encodedName + " and can not recover", t);
   }
 

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

@@ -64,7 +64,7 @@ public void close() throws IOException {
     }
     if (error != null) {
       throw new IOException("Failed to close at least one writer, please see the warn log above. " +
-        "The cause is the first exception occured", error);
+        "The cause is the first exception occurred", error);
     }
   }
 

hbase-server/src/main/java/org/apache/hadoop/hbase/security/access/AccessChecker.java

@@ -528,7 +528,7 @@ public static List<String> getUserGroups(String user) {
     try {
       return groupService.getGroups(user);
     } catch (IOException e) {
-      LOG.error("Error occured while retrieving group for " + user, e);
+      LOG.error("Error occurred while retrieving group for " + user, e);
       return new ArrayList<>();
     }
   }