HDFS-11526. Fix confusing block recovery message. Contributed by Yiqun Lin.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockRecoveryWorker.java

@@ -167,9 +167,8 @@ public class BlockRecoveryWorker {
           return;
         } catch (IOException e) {
           ++errorCount;
-          InterDatanodeProtocol.LOG.warn(
-              "Failed to obtain replica info for block (=" + block
-                  + ") from datanode (=" + id + ")", e);
+          InterDatanodeProtocol.LOG.warn("Failed to recover block (block="
+              + block + ", datanode=" + id + ")", e);
         }
       }
 
@@ -429,9 +428,8 @@ public class BlockRecoveryWorker {
                   + rBlock.getNewGenerationStamp() + " is aborted.", ripE);
           return;
         } catch (IOException e) {
-          InterDatanodeProtocol.LOG.warn(
-              "Failed to obtain replica info for block (=" + block
-                  + ") from datanode (=" + id + ")", e);
+          InterDatanodeProtocol.LOG.warn("Failed to recover block (block="
+              + block + ", datanode=" + id + ")", e);
         }
       }
       checkLocations(syncBlocks.size());