HDFS-11783. Ozone: Fix spotbugs warnings. Contributed by Weiwei Yang.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/cblock/meta/VolumeDescriptor.java

@@ -262,16 +262,7 @@ public class VolumeDescriptor {
           return false;
         }
       }
-      for (String containerKey : containerMap.keySet()) {
-        if (!other.containerMap.containsKey(containerKey)) {
-          return false;
-        }
-        if (!containerMap.get(containerKey).equals(
-            other.containerMap.get(containerKey))) {
-          return false;
-        }
-      }
-      return true;
+      return containerMap.equals(other.containerMap);
     }
     return false;
   }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/scm/block/BlockManagerImpl.java

@@ -104,7 +104,6 @@ public class BlockManagerImpl implements BlockManager {
     }
     Options options = new Options();
     options.cacheSize(this.cacheSize * OzoneConsts.MB);
-    options.createIfMissing();
 
     // Write the block key to container name mapping.
     File blockContainerDbPath = new File(scmMetaDataDir, BLOCK_DB);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/scm/cli/SQLCLI.java

@@ -156,8 +156,12 @@ public class SQLCLI  extends Configured implements Tool {
       LOG.error("Error processing output path {}", outPath);
       return -1;
     }
-    if (!Files.exists(outPath.getParent())) {
-      Files.createDirectories(outPath.getParent());
+
+    Path outParentPath = outPath.getParent();
+    if (outParentPath != null) {
+      if (!Files.exists(outParentPath)) {
+        Files.createDirectories(outParentPath);
+      }
     }
     LOG.info("Parent path [{}] db name [{}]", parentPath, dbName);
     if (dbName.toString().equals(CONTAINER_DB)) {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/scm/container/ContainerMapping.java

@@ -87,7 +87,6 @@ public class ContainerMapping implements Mapping {
     }
     Options options = new Options();
     options.cacheSize(this.cacheSize * OzoneConsts.MB);
-    options.createIfMissing();
 
     // Write the container name to pipeline mapping.
     File containerDBPath = new File(scmMetaDataDir, CONTAINER_DB);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/ozone/scm/node/SCMNodePoolManager.java

@@ -89,7 +89,6 @@ public final class SCMNodePoolManager implements NodePoolManager {
     }
     Options options = new Options();
     options.cacheSize(cacheSize * OzoneConsts.MB);
-    options.createIfMissing();
 
     File nodePoolDBPath = new File(scmMetaDataDir, NODEPOOL_DB);
     nodePoolStore = new LevelDBStore(nodePoolDBPath, options);