bk commit into 5.1 tree (aelkin:1.2545) BUG#27583

[Andrei Elkin]

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ChangeSet@stripped, 2007-04-09 19:26:51+03:00, aelkin@stripped +1 -0
  Bug #27583 slave sql fails to read from iocache when slave got stopped at pos==4
  
  showed up in set of tests rpl_start_stop_slave.test,  rpl_row_create_table.test, rpl000017.test
  as failure of slave sql thread to read from iocache when slave got stopped having read only first 4 bytes
  from the master binlog.
  
  Appeared to be forgotten assignment to rpl->group_relay_log_name. If the group pos is changed at that particur
  place a similar change should happen to the group log name in step.
  After the fix slave might safely stop and relay log info will consists of correct pair 
  (relay log_name, relay log_pos).
  The correct relay log info is the guarantee that slave will restart w/o the problem.

  sql/log_event.cc@stripped, 2007-04-09 19:26:44+03:00, aelkin@stripped +3 -0
    modifing group_relay_log_name in step with _pos

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	aelkin
# Host:	dsl-hkibras1-ff1dc300-249.dhcp.inet.fi
# Root:	/home/elkin/MySQL/TEAM/FIXES/5.1/bug27563-rl_group_name

--- 1.275/sql/log_event.cc	2007-03-30 16:29:27 +03:00
+++ 1.276/sql/log_event.cc	2007-04-09 19:26:44 +03:00
@@ -3648,6 +3648,9 @@ int Rotate_log_event::do_update_pos(RELA
     memcpy(rli->group_master_log_name, new_log_ident, ident_len+1);
     rli->notify_group_master_log_name_update();
     rli->group_master_log_pos= pos;
+    strmake(rli->group_relay_log_name, rli->event_relay_log_name,
+            sizeof(rli->group_relay_log_name) - 1);
+    rli->notify_group_relay_log_name_update();
     rli->group_relay_log_pos= rli->event_relay_log_pos;
     DBUG_PRINT("info", ("new group_master_log_name: '%s'  "
                         "new group_master_log_pos: %lu",