Merge pull request #9240 from JiayiFeng/fix_bug_in_recordio

Fix a bug of RecordIO

paddle/fluid/recordio/header.cc

@@ -29,8 +29,8 @@ Header::Header(uint32_t num, uint32_t sum, Compressor c, uint32_t cs)
 
 bool Header::Parse(std::istream& is) {
   uint32_t magic;
-  size_t read_size =
-      is.readsome(reinterpret_cast<char*>(&magic), sizeof(uint32_t));
+  is.read(reinterpret_cast<char*>(&magic), sizeof(uint32_t));
+  size_t read_size = is.gcount();
   if (read_size < sizeof(uint32_t)) {
     return false;
   }

paddle/fluid/recordio/scanner.cc

@@ -28,6 +28,7 @@ Scanner::Scanner(const std::string &filename) {
 }
 
 void Scanner::Reset() {
+  stream_->clear();
   stream_->seekg(0, std::ios::beg);
   ParseNextChunk();
 }