upmerge from mysql-5.1 branch -> mysql-5.5 branch

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/log_event.cc b/sql/log_event.cc
index f932056dfd6..fe0e8c19c35 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -3164,6 +3164,12 @@ void Query_log_event::print(FILE* file, PRINT_EVENT_INFO* print_event_info)
 {
   Write_on_release_cache cache(&print_event_info->head_cache, file);
 
+  /**
+    reduce the size of io cache so that the write function is called
+    for every call to my_b_write().
+   */
+  DBUG_EXECUTE_IF ("simulate_file_write_error",
+                   {(&cache)->write_pos= (&cache)->write_end- 500;});
   print_query_header(&cache, print_event_info);
   my_b_write(&cache, (uchar*) query, q_len);
   my_b_printf(&cache, "\n%s\n", print_event_info->delimiter);