| Bug #42651 | Regression: falcon_bug_22169-big started to fail with error 305 | ||
|---|---|---|---|
| Submitted: | 6 Feb 2009 14:52 | Modified: | 15 May 2009 16:13 |
| Reporter: | Hakan Küçükyılmaz | Email Updates: | |
| Status: | Closed | Impact on me: | |
| Category: | MySQL Server: Falcon storage engine | Severity: | S1 (Critical) |
| Version: | mysql-6.0-falcon-team | OS: | Linux (or any) |
| Assigned to: | Christopher Powers | CPU Architecture: | Any |
| Tags: | F_MEMORY | ||
[3 Mar 2009 7:33]
Bugs System
A patch for this bug has been committed. After review, it may be pushed to the relevant source trees for release in the next version. You can access the patch from: http://lists.mysql.com/commits/68093 3046 Christopher Powers 2009-03-03 Bug #42651 "Regression: falcon_bug_22169-big started to fail with error 305" Bug #33177 "Table creation fails after error 305 and tablespace change" Bug #32838 "Falcon; error 1296 : Got error 305 'record memory is exhausted'" The fix for these bugs is the first of several improvements to Falcon's memory management (Worklog TBD). Falcon out-of-memory errors are caused by a combination of things. Recent improvements to the Scavenger and to the Backlogging subsystem (Bug#42592) have contributed to the resolution of these bugs, however, certain operations can still fill the record cache to the point where scavenging is ineffective. Scavenging efficiency will be greatly improved by allocating record data and metadata separately. The record cache now stores only actual record data, and Record and RecordVersion objects (metadata) are allocated from separate memory pools. The metadata memory pools are completely homogeneous, with no memory fragmentation. The record cache will also be far less fragmented, because large blocks of record data will no longer be interspersed with very small blocks of object data. Decoupling the data and metadata will also greatly reduce the number of out-of-memory conditions--typically seen during large inserts and updates--because the memory pools are allowed to grow independently. These memory pools may flucuate considerably during massive transactions, depending upon the record makeup and type of operation. This flucuation, however, serves only to emphasize the value managing these memory pools separately. One side-effect of this change is that, while the record cache max size remains fixed, the record metadata caches can grow unbounded. Although this is not unprecedented (Falcon's general purpose memory pool has always been unbounded), one remaining challenge is to ensure that the Falcon memory manager releases resources back to the system as soon as possible.
[2 Apr 2009 17:39]
Bugs System
Pushed into 6.0.11-alpha (revid:hky@sun.com-20090402144811-yc5kp8g0rjnhz7vy) (version source revid:christopher.powers@sun.com-20090303070929-ig36zlo3luoxrm2t) (merge vers: 6.0.11-alpha) (pib:6)
[15 May 2009 16:13]
MC Brown
Internal/test fix. No changelog entry required.
Description: falcon.falcon_bug_22169-big regressed with error 305. Verified by WFTO on on my laptop. How to repeat: ./mysql-test-run.pl --big-test --force --skip-ndb --suite=falcon falcon_bug_22169-big worker[1] Using MTR_BUILD_THREAD 250, with reserved ports 12500..12509 falcon.falcon_bug_22169-big [ fail ] Test ended at 2009-02-06 15:49:58 CURRENT_TEST: falcon.falcon_bug_22169-big mysqltest: At line 49: query 'INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1' failed: 1296: Got error 305 'record memory is exhausted' from Falcon