message: remove KERB_TICKET_CACHE_PATH env
diff: @@ -59,8 +59,6 @@ class LibHDFS {
  std::function<hdfsBuilder*()> hdfsNewBuilder;
  std::function<void(hdfsBuilder*, const char*)> hdfsBuilderSetNameNode;
  std::function<int(const char*, char**)> hdfsConfGetStr;
  - std::function<void(hdfsBuilder*, const char* kerbTicketCachePath)>
  - hdfsBuilderSetKerbTicketCachePath;
  std::function<int(hdfsFS, hdfsFile)> hdfsCloseFile;
  std::function<tSize(hdfsFS, hdfsFile, tOffset, void*, tSize)> hdfsPread;
  std::function<tSize(hdfsFS, hdfsFile, const void*, tSize)> hdfsWrite;
  @@ -87,7 +85,6 @@ class LibHDFS {
  BIND_HDFS_FUNC(hdfsNewBuilder);
  BIND_HDFS_FUNC(hdfsBuilderSetNameNode);
  BIND_HDFS_FUNC(hdfsConfGetStr);
  - BIND_HDFS_FUNC(hdfsBuilderSetKerbTicketCachePath);
  BIND_HDFS_FUNC(hdfsCloseFile);
  BIND_HDFS_FUNC(hdfsPread);
  BIND_HDFS_FUNC(hdfsWrite);
  @@ -166,13 +163,6 @@ Status HadoopFileSystem::Connect(StringPiece fname, hdfsFS* fs) {
  } else {
  hdfs_->hdfsBuilderSetNameNode(builder, nn.c_str());
  }
  - // KERB_TICKET_CACHE_PATH will be deleted in the future, Because KRB5CCNAME is
  - // the build in environment variable of Kerberos, so KERB_TICKET_CACHE_PATH
  - // and related code are unnecessary.
  - char* ticket_cache_path = getenv("KERB_TICKET_CACHE_PATH");
  - if (ticket_cache_path != nullptr) {
  - hdfs_->hdfsBuilderSetKerbTicketCachePath(builder, ticket_cache_path);
  - }
  *fs = hdfs_->hdfsBuilderConnect(builder);
  if (*fs == nullptr) {
  return errors::NotFound(strerror(errno));
  