Better error logging on RocksDB write error

Summary:
On I/O error, error strings can be fetched by
rocksdb::String.ToString().c_str(), though errno is lost.
This diff adds messages on I/O error.
This diff also updates RocksDB revision to the latest, and fixed a
compiler error.

@update-submodule: rocksdb

Test Plan:
Simulated disk error then got below message and crashed.
 2015-09-10 11:49:33 3218281 [ERROR] RocksDB: Failed to write to WAL -
status 5, IO error: ./.rocksdb/000038.log: No space left on device
 2015-09-10 11:49:33 3218281 [ERROR] RocksDB: Aborting on WAL write
error.

Reviewers: spetrunia, hermanlee4, maykov

Reviewed By: maykov

Differential Revision: https://reviews.facebook.net/D46599

Author: yoshinorim

storage/rocksdb/ha_rocksdb.cc

@@ -6259,16 +6259,17 @@ void rocksdb_handle_io_error(rocksdb::Status status, enum io_error_type type)
     case ROCKSDB_IO_ERROR_TRX_COMMIT:
     case ROCKSDB_IO_ERROR_DICT_COMMIT:
     {
-      sql_print_error("RocksDB: Failed to write to WAL - status %d",
-                      status.code());
+      sql_print_error("RocksDB: Failed to write to WAL - status %d, %s",
+                      status.code(), status.ToString().c_str());
       sql_print_error("RocksDB: Aborting on WAL write error.");
       abort_with_stack_traces();
       break;
     }
     case ROCKSDB_IO_ERROR_BG_THREAD:
     {
       sql_print_warning("RocksDB: BG Thread failed to write to RocksDB "
-                        "- status %d", status.code());
+                        "- status %d, %s", status.code(),
+                        status.ToString().c_str());
       break;
     }
     default:
@@ -6278,8 +6279,8 @@ void rocksdb_handle_io_error(rocksdb::Status status, enum io_error_type type)
   }
   else if (status.IsCorruption())
   {
-      sql_print_error("RocksDB: Data Corruption detected! %d",
-                      status.code());
+      sql_print_error("RocksDB: Data Corruption detected! %d, %s",
+                      status.code(), status.ToString().c_str());
       sql_print_error("RocksDB: Aborting because of data corruption.");
       abort_with_stack_traces();
   }
@@ -6288,15 +6289,17 @@ void rocksdb_handle_io_error(rocksdb::Status status, enum io_error_type type)
     switch (type) {
     case ROCKSDB_IO_ERROR_DICT_COMMIT:
     {
-      sql_print_error("RocksDB: Failed to write to WAL (dictionary) - status %d",
-                      status.code());
+      sql_print_error("RocksDB: Failed to write to WAL (dictionary) - "
+                      "status %d, %s",
+                      status.code(), status.ToString().c_str());
       sql_print_error("RocksDB: Aborting on WAL write error.");
       abort_with_stack_traces();
       break;
     }
     default:
       sql_print_warning("RocksDB: Failed to write to RocksDB "
-                        "- status %d", status.code());
+                        "- status %d, %s", status.code(),
+                        status.ToString().c_str());
       break;
     }
   }

storage/rocksdb/rdb_i_s.cc

@@ -454,6 +454,7 @@ static int i_s_rocksdb_cfoptions_fill_table(THD *thd,
         case rocksdb::kBZip2Compression: val.append("kBZip2Compression:"); break;
         case rocksdb::kLZ4Compression: val.append("kLZ4Compression:"); break;
         case rocksdb::kLZ4HCCompression: val.append("kLZ4HCCompression:"); break;
+        case rocksdb::kZSTDNotFinalCompression: val.append("kZSTDNotFinalCompression"); break;
       }
     }
     val.pop_back();