MySQL Bugs: #7714: if disk full, sometimes MyISAM doesn't wait for free space, corrupts table

Bug #7714	if disk full, sometimes MyISAM doesn't wait for free space, corrupts table
Submitted:	6 Jan 2005 21:13	Modified:	6 Jan 2005 21:39
Reporter:	Guilhem Bichot
Status:	Closed
Category:	Server: MyISAM	Severity:	S3 (Non-critical)
Version:	4.0.23	OS:	Any (all)
Assigned to:	Guilhem Bichot	Target Version:

Description:
mysqld is running as a user which has a quota; a large INSERT is running; instead of 
blocking (waiting for free space) when quota is exceeded, the INSERT terminates with:
ERROR 1030 (HY000) at line 1: Got error 127 from storage engine
and a CHECK TABLE then:
+--------+-------+----------+---------------------------------------------------+
| Table  | Op    | Msg_type | Msg_text                                          |
+--------+-------+----------+---------------------------------------------------+
| test.t | check | error    | Size of datafile is: 8192         Should be: 8280 |
| test.t | check | error    | Corrupt                                           |
+--------+-------+----------+---------------------------------------------------+
This happens only if the write() cannot even write one byte.

How to repeat:
see description

Suggested fix:
my_write() is the only buggy place; it has a test for writenbytes != -1, to be removed.

After the pending fix, we see the INSERT block and this message goes to error log:
50106 16:49:21 [ERROR] /home/mysql_src/mysql-4.1-clean/sql/mysqld: Disk is full writing
'./test/t.MYD' (Errcode: 122). Waiting for someone to free space... Retry in 60 secs

Thank you for your bug report. This issue has been committed to our
source repository of that product and will be incorporated into the
next release.

If necessary, you can access the source repository and build the latest
available version, including the bugfix, yourself. More information 
about accessing the source trees is available at
    http://www.mysql.com/doc/en/Installing_source_tree.html

Additional info:

Fixed in 4.0 in ChangeSet@1.2022, 2005-01-06 21:30:39+01:00, guilhem@mysql.com