Revert "HDFS-14099. Unknown frame descriptor when decompressing multiple frames (#3836)"

This reverts commit 05b43f2057.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/zstd/ZStandardDecompressor.java

@@ -113,12 +113,6 @@ public class ZStandardDecompressor implements Decompressor {
     compressedDirectBuf.put(
         userBuf, userBufOff, bytesInCompressedBuffer);
 
-    // Set the finished to false when compressedDirectBuf still
-    // contains some bytes.
-    if (compressedDirectBuf.position() > 0 && finished) {
-      finished = false;
-    }
-
     userBufOff += bytesInCompressedBuffer;
     userBufferBytesToConsume -= bytesInCompressedBuffer;
   }
@@ -192,13 +186,6 @@ public class ZStandardDecompressor implements Decompressor {
         0,
         directBufferSize
     );
-
-    // Set the finished to false when compressedDirectBuf still
-    // contains some bytes.
-    if (remaining > 0 && finished) {
-      finished = false;
-    }
-
     uncompressedDirectBuf.limit(n);
 
     // Get at most 'len' bytes

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/zstd/TestZStandardCompressorDecompressor.java

@@ -234,65 +234,6 @@ public class TestZStandardCompressorDecompressor {
     }
   }
 
-  /**
-   * Verify decompressor logic with some finish operation in compress.
-   */
-  @Test
-  public void testCompressorDecompressorWithFinish() throws Exception {
-    DataOutputStream deflateOut = null;
-    DataInputStream inflateIn = null;
-    int byteSize = 1024 * 100;
-    byte[] bytes = generate(byteSize);
-    int firstLength = 1024 * 30;
-
-    int bufferSize = IO_FILE_BUFFER_SIZE_DEFAULT;
-    try {
-      DataOutputBuffer compressedDataBuffer = new DataOutputBuffer();
-      CompressionOutputStream deflateFilter =
-              new CompressorStream(compressedDataBuffer, new ZStandardCompressor(),
-                      bufferSize);
-
-      deflateOut =
-              new DataOutputStream(new BufferedOutputStream(deflateFilter));
-
-      // Write some data and finish.
-      deflateOut.write(bytes, 0, firstLength);
-      deflateFilter.finish();
-      deflateOut.flush();
-
-      // ResetState then write some data and finish.
-      deflateFilter.resetState();
-      deflateOut.write(bytes, firstLength, firstLength);
-      deflateFilter.finish();
-      deflateOut.flush();
-
-      // ResetState then write some data and finish.
-      deflateFilter.resetState();
-      deflateOut.write(bytes, firstLength * 2, byteSize - firstLength * 2);
-      deflateFilter.finish();
-      deflateOut.flush();
-
-      DataInputBuffer deCompressedDataBuffer = new DataInputBuffer();
-      deCompressedDataBuffer.reset(compressedDataBuffer.getData(), 0,
-              compressedDataBuffer.getLength());
-
-      CompressionInputStream inflateFilter =
-              new DecompressorStream(deCompressedDataBuffer,
-                      new ZStandardDecompressor(bufferSize), bufferSize);
-
-      inflateIn = new DataInputStream(new BufferedInputStream(inflateFilter));
-
-      byte[] result = new byte[byteSize];
-      inflateIn.read(result);
-      assertArrayEquals(
-              "original array not equals compress/decompressed array", bytes,
-              result);
-    } finally {
-      IOUtils.closeStream(deflateOut);
-      IOUtils.closeStream(inflateIn);
-    }
-  }
-
   @Test
   public void testZStandardCompressDecompressInMultiThreads() throws Exception {
     MultithreadedTestUtil.TestContext ctx =