HDFS-10717. Fix findbugs warnings of hadoop-hdfs-client in branch-2. Contributed by Akira Ajisaka.

(cherry picked from commit 6ead6f3bb83b5c27d884401fb950b5b629fec7ec)

hadoop-hdfs-project/hadoop-hdfs-client/dev-support/findbugsExcludeFile.xml

@@ -1,9 +1,12 @@
 <FindBugsFilter>
   <Match>
     <Or>
+      <Class name="org.apache.hadoop.fs.BlockStorageLocation"/>
+      <Class name="org.apache.hadoop.fs.HdfsVolumeId"/>
       <Class name="org.apache.hadoop.fs.XAttr"/>
       <Class name="org.apache.hadoop.fs.XAttr$Builder"/>
       <Class name="org.apache.hadoop.hdfs.inotify.EventBatch"/>
+      <Class name="org.apache.hadoop.hdfs.protocol.HdfsBlocksMetadata"/>
       <Class name="org.apache.hadoop.hdfs.protocol.HdfsFileStatus"/>
       <Class name="org.apache.hadoop.hdfs.protocol.LocatedBlock"/>
       <Class name="org.apache.hadoop.hdfs.protocol.BlockStoragePolicy"/>

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DataStreamer.java

@@ -404,7 +404,6 @@ class DataStreamer extends Daemon {
                        ByteArrayManager byteArrayManage,
                        boolean isAppend, String[] favoredNodes,
                        EnumSet<AddBlockFlag> flags) {
-    this.block = block;
     this.dfsClient = dfsClient;
     this.src = src;
     this.progress = progress;