Hi Sergey, > I'm afraid fixing rnd_end() callers in the server may stall for a long time. O.K. No need to fix it if it is not easy. This request is not high priority request.
> Is it accaptable for spider to use bulk updates and deletes API instead > (see handler.h: start_bulk_update/start_bulk_delete). Spider use it already. This API is not used if target table has after trigger. I understand why this API is not used in this case, but it sometimes causes performance problem. So, I thought it is better to prepare other choice for something wrong. Anyway, I will disable bulk updating/deleting feature without using API. > Nope, it looks like a bug in thread pool. MDEV-4739 has different trace, how did you get this one? Just executed given test? I got this trace when I try to reproduce MDEV-4739. I did as the followings. 1. start mysqld 2. log in mysqld 3. mysql> CREATE TABLE t1 (a INT) ENGINE=InnoDB; 4. mysql> XA START 'xa1'; 5. mysql> INSERT INTO t1 (a) VALUES (1),(2); 6. mysql> XA END 'xa1'; 7. mysql> XA PREPARE 'xa1'; 8. kill -9 mysqld_safe and mysqld from another terminal 9. start mysqld on gdb At that time, InnoDB and Spider were enabled and log-bin was disabled. So probably "total_ha_2pc > 1" was true, "opt_bin_log" was false. Does it help you? Thanks, Kentoku 2013/9/19 Sergey Vojtovich <[email protected]> > Hi Kentoku, > > I'm adding MariaDB developers to CC. > > On Thu, Sep 19, 2013 at 01:19:13AM +0900, kentoku wrote: > > Hi Sergey, > > > > > But what kind of errors are possible in your case? Other storage > engines > > doesn't > > seem to suffer from this API violation. > > > > Spider support bulk updating and deleting for avoiding network roundtrip > > between data node. Some times, last bulk updating is executed in > rnd_end() > > function. So rnd_end() has possibility getting errors from data node. > I'm afraid fixing rnd_end() callers in the server may stall for a long > time. > Is it accaptable for spider to use bulk updates and deletes API instead > (see handler.h: start_bulk_update/start_bulk_delete). > > > By the way, about MDEV-4739. I get the following stack trace. > > Program received signal SIGSEGV, Segmentation fault. > > 0x00000000005eabf6 in thd_wait_begin (thd=0x29da060, > > wait_type=10) > > at /ssd1/mariadb-10.0.4/sql/sql_class.cc:4277 > > 4277 MYSQL_CALLBACK(thd->scheduler, thd_wait_begin, (thd, > wait_type)); > > (gdb) print thd > > $1 = (THD *) 0x29da060 > > (gdb) bt > > #0 0x00000000005eabf6 in thd_wait_begin ( > > thd=0x29da060, wait_type=10) > > at /ssd1/mariadb-10.0.4/sql/sql_class.cc:4277 > > #1 0x000000000072a114 in scheduler_wait_sync_begin () > > at /ssd1/mariadb-10.0.4/sql/scheduler.cc:59 > > #2 0x0000000000d6dc20 in my_sync (fd=23, my_flags=0) > > at /ssd1/mariadb-10.0.4/mysys/my_sync.c:76 > > #3 0x0000000000d6b54f in my_msync (fd=23, > > addr=0x7ffff7ff4000, len=4096, flags=4) > > at /ssd1/mariadb-10.0.4/mysys/my_mmap.c:27 > > #4 0x00000000008bea03 in TC_LOG_MMAP::open ( > > this=0x16e6a00, opt_name=0xe19c87 "tc.log") > > at /ssd1/mariadb-10.0.4/sql/log.cc:7735 > > #5 0x00000000005751cb in init_server_components () > > at /ssd1/mariadb-10.0.4/sql/mysqld.cc:4797 > > #6 0x0000000000575a07 in mysqld_main (argc=30, > > argv=0x1f204d0) > > at /ssd1/mariadb-10.0.4/sql/mysqld.cc:5208 > > #7 0x000000000056d884 in main (argc=11, > > argv=0x7fffffffe3a8) > > at /ssd1/mariadb-10.0.4/sql/main.cc:25 > > (gdb) print thd->scheduler > > $2 = (scheduler_functions *) 0x8f8f8f8f8f8f8f8f > > (gdb) print thd_wait_begin > > $3 = {void (THD *, > > int)} 0x5eaba4 <thd_wait_begin(THD*, int)> > > (gdb) print wait_type > > $4 = 10 > > > > It is looks that "thd->scheduler" is not initialized. What do you think? > > Must storage engine set it? > Nope, it looks like a bug in thread pool. MDEV-4739 has different trace, > how > did you get this one? Just executed given test? > > Regards, > Sergey >
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