[fix](be) Fix creating hdfs connection coredump within bthread

* https://brpc.apache.org/docs/server/basics/
* According to the brpc doc, `JNI code checks stack layout and cannot be run in bthreads`
  so create a pthread for creating hdfs connection if necessary.

be/src/io/hdfs_util.cpp

@@ -21,6 +21,7 @@
 #include <gen_cpp/cloud.pb.h>
 
 #include <ostream>
+#include <thread>
 
 #include "common/logging.h"
 #include "io/fs/err_utils.h"
@@ -30,7 +31,7 @@
 namespace doris::io {
 namespace {
 
-Status create_hdfs_fs(const THdfsParams& hdfs_params, const std::string& fs_name, hdfsFS* fs) {
+Status _create_hdfs_fs(const THdfsParams& hdfs_params, const std::string& fs_name, hdfsFS* fs) {
     HDFSCommonBuilder builder;
     RETURN_IF_ERROR(create_hdfs_builder(hdfs_params, fs_name, &builder));
     hdfsFS hdfs_fs = hdfsBuilderConnect(builder.get());
@@ -41,6 +42,22 @@ Status create_hdfs_fs(const THdfsParams& hdfs_params, const std::string& fs_name
     return Status::OK();
 }
 
+inline bool is_bthread() {
+    return (bthread_self() != 0);
+}
+
+Status create_hdfs_fs(const THdfsParams& hdfs_params, const std::string& fs_name, hdfsFS* fs) {
+    if (is_bthread()) {
+        Status st;
+        std::thread t([&] { st = _create_hdfs_fs(hdfs_params, fs_name, fs); });
+        if (t.joinable()) {
+            t.join();
+        }
+        return st;
+    }
+    return _create_hdfs_fs(hdfs_params, fs_name, fs);
+}
+
 uint64_t hdfs_hash_code(const THdfsParams& hdfs_params, const std::string& fs_name) {
     uint64_t hash_code = 0;
     // The specified fsname is used first.