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 20:13	Modified:	6 Jan 2005 20:39
Reporter:	Guilhem Bichot	Email Updates:
Status:	Closed	Impact on me:	None
Category:	MySQL Server: MyISAM storage engine	Severity:	S3 (Non-critical)
Version:	4.0.23	OS:	Any (all)
Assigned to:	Guilhem Bichot	CPU Architecture:	Any

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
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next release.

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Additional info:

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