Avoid logging under mutex in DBImpl::WriteLevel0TableForRecovery().

Summary: Avoid logging under mutex in DBImpl::WriteLevel0TableForRecovery().

Test Plan: make all check

Reviewers: igor, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D38823

db/db_impl.cc

@@ -1155,9 +1155,6 @@ Status DBImpl::WriteLevel0TableForRecovery(int job_id, ColumnFamilyData* cfd,
           cfd->ioptions()->compression_opts, paranoid_file_checks, Env::IO_HIGH,
           &table_properties);
       LogFlush(db_options_.info_log);
-      mutex_.Lock();
-    }
-  }
       Log(InfoLogLevel::DEBUG_LEVEL, db_options_.info_log,
           "[%s] [WriteLevel0TableForRecovery]"
           " Level-0 table #%" PRIu64 ": %" PRIu64 " bytes %s",
@@ -1170,7 +1167,9 @@ Status DBImpl::WriteLevel0TableForRecovery(int job_id, ColumnFamilyData* cfd,
             &event_logger_, job_id, meta.fd.GetNumber(), meta.fd.GetFileSize(),
             table_properties);
       }
-
+      mutex_.Lock();
+    }
+  }
   ReleaseFileNumberFromPendingOutputs(pending_outputs_inserted_elem);
 
   // Note that if file_size is zero, the file has been deleted and