diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/EncodedDataBlock.java b/hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/EncodedDataBlock.java
index 6959edd367c4..c4638cc20b1c 100644
--- a/hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/EncodedDataBlock.java
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/EncodedDataBlock.java
@@ -255,7 +255,7 @@ public byte[] encodeData() {
       }
       BufferGrabbingByteArrayOutputStream stream = new BufferGrabbingByteArrayOutputStream();
       baos.writeTo(stream);
-      this.dataBlockEncoder.endBlockEncoding(encodingCtx, out, stream.getOurBytes());
+      this.dataBlockEncoder.endBlockEncoding(encodingCtx, out, stream.toByteArray());
     } catch (IOException e) {
       throw new RuntimeException(String.format(
           "Bug in encoding part of algorithm %s. " +
@@ -268,14 +268,15 @@ public byte[] encodeData() {
   private static class BufferGrabbingByteArrayOutputStream extends ByteArrayOutputStream {
     private byte[] ourBytes;
 
-    private synchronized byte[] getOurBytes() {
-      return ourBytes;
-    }
-
     @Override
     public synchronized void write(byte[] b, int off, int len) {
       this.ourBytes = b;
     }
+
+    @Override
+    public synchronized byte[] toByteArray() {
+      return ourBytes;
+    }
   }
 
   @Override
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
index f9d92aba9c32..503cc6bf192c 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
@@ -3078,7 +3078,7 @@ public List<String> listNamespaces() throws IOException {
       }
     }
     if (cpHost != null) {
-      bypass = cpHost.postListNamespaces(namespaces);
+      cpHost.postListNamespaces(namespaces);
     }
     return namespaces;
   }
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/MasterQuotaManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/MasterQuotaManager.java
index f48533ddf43e..9c9b4d0566c1 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/MasterQuotaManager.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/MasterQuotaManager.java
@@ -440,9 +440,10 @@ private void applyThrottle(final Quotas.Builder quotas, final ThrottleRequest re
         case READ_SIZE:
           if (req.hasTimedQuota()) {
             throttle.setReadSize(req.getTimedQuota());
-        } else {
-          throttle.clearReadSize();
-        }
+          } else {
+            throttle.clearReadSize();
+          }
+          break;
         case REQUEST_CAPACITY_UNIT:
           if (req.hasTimedQuota()) {
             throttle.setReqCapacityUnit(req.getTimedQuota());
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
index aa0375b8460d..b4b7c5f45265 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
@@ -7959,7 +7959,9 @@ public Result append(Append mutate, long nonceGroup, long nonce) throws IOExcept
         for (Map.Entry<Store, List<Cell>> entry: removedCellsForMemStore.entrySet()) {
           entry.getKey().add(entry.getValue());
         }
-        if (we != null) mvcc.complete(we);
+        if (we != null) {
+          mvcc.complete(we);
+        }
       } else if (we != null) {
         mvcc.completeAndWait(we);
       }
@@ -8180,6 +8182,7 @@ private Result doIncrement(Increment increment, long nonceGroup, long nonce) thr
         rowLock.release();
       }
       // if the wal sync was unsuccessful, remove keys from memstore
+      WriteEntry we = walKey != null ? walKey.getWriteEntry() : null;
       if (doRollBackMemstore) {
         for (Map.Entry<Store, List<Cell>> entry: forMemStore.entrySet()) {
           rollbackMemstore(entry.getKey(), entry.getValue());
@@ -8187,9 +8190,13 @@ private Result doIncrement(Increment increment, long nonceGroup, long nonce) thr
         for (Map.Entry<Store, List<Cell>> entry: removedCellsForMemStore.entrySet()) {
           entry.getKey().add(entry.getValue());
         }
-        if (walKey != null) mvcc.complete(walKey.getWriteEntry());
+        if (we != null) {
+          mvcc.complete(we);
+        }
       } else {
-        if (walKey != null) mvcc.completeAndWait(walKey.getWriteEntry());
+        if (we != null) {
+          mvcc.completeAndWait(we);
+        }
       }
     }
 
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
index fb4ff9a9e061..41e891863bdc 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java
@@ -2796,10 +2796,14 @@ private void removeCompactedfiles(Collection<StoreFile> compactedfiles)
             // Just close and return
             filesToRemove.add(file);
           } else {
-            LOG.info("Can't archive compacted file " + file.getPath()
+            if (r != null) {
+              LOG.info("Can't archive compacted file " + file.getPath()
                 + " because of either isCompactedAway=" + r.isCompactedAway()
                 + " or file has reference, isReferencedInReads=" + r.isReferencedInReads()
                 + ", refCount=" + r.getRefCount() + ", skipping for now.");
+            } else {
+              LOG.info("Can't archive compacted file " + file.getPath() + ", skipping for now.");
+            }
           }
         } catch (Exception e) {
           LOG.error(
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/compaction/MajorCompactor.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/compaction/MajorCompactor.java
index 96faee8c2402..b2918e80dd0e 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/compaction/MajorCompactor.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/compaction/MajorCompactor.java
@@ -69,7 +69,7 @@
 public class MajorCompactor extends Configured implements Tool {
 
   private static final Logger LOG = LoggerFactory.getLogger(MajorCompactor.class);
-  protected static final Set<MajorCompactionRequest> ERRORS = Sets.newHashSet();
+  static final Set<MajorCompactionRequest> ERRORS = Sets.newHashSet();
 
   protected ClusterCompactionQueues clusterCompactionQueues;
   private long timestamp;