HADOOP-14616. Client fails to read a block with erasure code (XOR, native) when one of the data block is lost. Contributed by Huafeng Wang.

(cherry picked from commit fe84cdc9daa37af791a23a390e080777090c5e24)

hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/erasurecode/jni_xor_decoder.c

@@ -58,7 +58,8 @@ Java_org_apache_hadoop_io_erasurecode_rawcoder_NativeXORRawDecoder_decodeImpl(
   numParityUnits = ((IsalCoder*)xorDecoder)->numParityUnits;
   chunkSize = (int)dataLen;
 
-  getInputs(env, inputs, inputOffsets, xorDecoder->inputs, numDataUnits);
+  getInputs(env, inputs, inputOffsets, xorDecoder->inputs,
+      numDataUnits + numParityUnits);
   getOutputs(env, outputs, outputOffsets, xorDecoder->outputs, numParityUnits);
 
   for (i = 0; i < numDataUnits + numParityUnits; i++) {