hfutatzhanghb commented on code in PR #6509:
URL: https://github.com/apache/hadoop/pull/6509#discussion_r1498581949


##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockRecoveryWorker.java:
##########
@@ -436,9 +442,17 @@ protected void recover() throws IOException {
                   "datanode={})", block, internalBlk, id, e);
         }
       }
-      checkLocations(syncBlocks.size());
 
-      final long safeLength = getSafeLength(syncBlocks);
+      final long safeLength;
+      if (dnNotHaveReplicaCnt + zeroLenReplicaCnt <= locs.length - 
ecPolicy.getNumDataUnits()) {
+        checkLocations(syncBlocks.size());
+        safeLength = getSafeLength(syncBlocks);
+      } else {
+        safeLength = 0;
+        LOG.warn("Block recovery: More than {} datanodes do not have the 
replica of block {}." +

Review Comment:
   It seems useless here, have removed it . Originally, it was more than (9 - 
6) datanodes ...



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