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[Maria-discuss] New Question: Problem with the Galera wsrep_sst_method xtrabackup-v2
by AskMonty KB 05 Mar '16

05 Mar '16

Hello, A new question has been asked in "MariaDB Community" by aferrett. Please answer it at http://mariadb.com/kb/en/problem-with-the-galera-wsrep_sst_method-xtrabacku… as the person asking the question may not be subscribed to the mailing list. -------------------------------- We are trying to create a Galera cluster. We have our first node running. We want to use xtrabackup to initialize the 2nd cluster node. We are getting error: 2016-03-04 22:56:20 140441685063424 [ERROR] WSREP: Failed to read 'ready <addr>' from: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '130.9.221.48' --datadir '//opt/app/mysql/data/' --parent '28544' --binlog '//opt/app/mysql/binlogs/mysql-bin' Read: '(null)' 2016-03-04 22:56:20 140441685063424 [ERROR] WSREP: Process completed with error: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '130.9.221.48' --datadir '//opt/app/mysql/data/' --parent '28544' --binlog '//opt/app/mysql/binlogs/mysql-bin' : 1 (Operation not permitted) 2016-03-04 22:56:20 140441697642240 [ERROR] WSREP: Failed to prepare for 'xtrabackup-v2' SST. Unrecoverable. 2016-03-04 22:56:20 140441697642240 [ERROR] Aborting -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/problem-with-the-galera-wsrep_sst_method-xtrabacku…

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[Maria-discuss] New Question: MariaDB Connector/J
by AskMonty KB 05 Mar '16

05 Mar '16

Hello, A new question has been asked in "MariaDB FAQ" by xviakoh_g. Please answer it at http://mariadb.com/kb/en/mariadb-faq-mariadb-connectorj/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- Hi, We are using MariaDB Connector/J against our production AWS Aurora RDS and noticed that default socketTimeout is set to 10 seconds against Aurora. Is there a reason behind this default value? Is there any implication of increasing timeout that I should be aware? We do have transaction layer that times out at 60 seconds. So was thinking to up it to match our higher layer timeout. any advice is greatly appreciated. -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/mariadb-faq-mariadb-connectorj/

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[Maria-discuss] How to rollback XA Transactions
by Marc Schöchlin 04 Mar '16

04 Mar '16

Hi, i currently have the situation that i cannot modify tables/indices beaus of XA transactions which are in progress. mysql://root@localhost:/(none) - 11:37:55 > xa recover; +----------+--------------+--------------+------------------------------------------------------------------+ | formatID | gtrid_length | bqual_length | data | +----------+--------------+--------------+------------------------------------------------------------------+ | 4871251 | 35 | 29 | ^W<89>^B <E8>XF+foo-bar-de05,server,P4837foo-bar-de05,server,P4837,^A | | 4871251 | 35 | 29 | ^N<89>^B <E8>XF+foo-bar-de05,server,P4837foo-bar-de05,server,P4837,^A | +----------+--------------+--------------+------------------------------------------------------------------+ 2 rows in set (0.00 sec) The documentation (https://mariadb.com/kb/en/mariadb/xa-transactions/) suggests that xa transaction can be rolled back by using "xa rollback xid" but it seems that this is not possible because of the non-ascii characters. As you can see in the attached Innodb status, these transactions a active for a log time now and should not be relevant anymore. Naturally restarting the server should not help..... Do you have a suggestion how to prevent, solve or analyze this situation? Regards Marc ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ mysql://root@localhost:/(none) - 11:34:25 > SHOW ENGINE INNODB STATUS\G *************************** 1. row *************************** Type: InnoDB Name: Status: ===================================== 2016-02-20 11:34:50 7fba401d3700 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 31 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 57 srv_active, 0 srv_shutdown, 171810 srv_idle srv_master_thread log flush and writes: 171823 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 2076 OS WAIT ARRAY INFO: signal count 2072 Mutex spin waits 339, rounds 174, OS waits 3 RW-shared spins 2133, rounds 63046, OS waits 2069 RW-excl spins 0, rounds 0, OS waits 0 Spin rounds per wait: 0.51 mutex, 29.56 RW-shared, 0.00 RW-excl ------------ TRANSACTIONS ------------ Trx id counter 1969875 Purge done for trx's n:o < 1965495 undo n:o < 0 state: running but idle History list length 316 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 0, not started MySQL thread id 4362, OS thread handle 0x7fba401d3700, query id 23179 localhost root init SHOW ENGINE INNODB STATUS ---TRANSACTION 1969667, not started MySQL thread id 1, OS thread handle 0x7fba41298700, query id 0 Waiting for background binlog tasks ---TRANSACTION 413370, ACTIVE (PREPARED) 172053 sec recovered trx , undo log entries 9 Trx #rec lock waits 0 #table lock waits 0 Trx total rec lock wait time 0 SEC Trx total table lock wait time 0 SEC ---TRANSACTION 413360, ACTIVE (PREPARED) 172053 sec recovered trx , undo log entries 11 Trx #rec lock waits 0 #table lock waits 0 Trx total rec lock wait time 0 SEC Trx total table lock wait time 0 SEC -------- FILE I/O -------- I/O thread 0 state: waiting for completed aio requests (insert buffer thread) I/O thread 1 state: waiting for completed aio requests (log thread) I/O thread 2 state: waiting for completed aio requests (read thread) I/O thread 3 state: waiting for completed aio requests (read thread) I/O thread 4 state: waiting for completed aio requests (read thread) I/O thread 5 state: waiting for completed aio requests (read thread) I/O thread 6 state: waiting for completed aio requests (write thread) I/O thread 7 state: waiting for completed aio requests (write thread) I/O thread 8 state: waiting for completed aio requests (write thread) I/O thread 9 state: waiting for completed aio requests (write thread) 1 row in set (0.00 sec) Regards Marc -- GPG encryption available: 0x670DCBEC/pool.sks-keyservers.net (https://www.256bit.org/keys/mschoechlin.pub.asc)

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[Maria-discuss] New Question: Aria System Variables: aria_block_size
by AskMonty KB 03 Mar '16

03 Mar '16

Hello, A new question has been asked in "Aria" by paul.pech_41353. Please answer it at http://mariadb.com/kb/en/aria-system-variables-aria_block_size/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- Hi Are there any guidelines on how to decide what block sizes to use for Aria index pages? We've just switched from MySQL and MyISAM to MariaDB and Aria and noticed a significant drop in performance when full table scans are necessary. In our environment we have 10.000+ databases each with about 20 tables. Each database is usually smaller than 30 - 40 MB (90% of this is contained in roughly 3-4 tables, all other tables usually contain just a couple of rows). Am I correct in assuming that in this case (many comparatively small tables) a small block size (say 2048) could help to improve performance, while for huge tables a larger block size (the default value) is recommended? Any other tips on how to fine tune Aria in particular and MariaDB in general for our use case are highly appreciated. Thanks for a great product and a well written documentation! Yours Paul -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/aria-system-variables-aria_block_size/

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[Maria-discuss] New Question: MariaDB removes all users on restart
by AskMonty KB 03 Mar '16

03 Mar '16

Hello, A new question has been asked in "MariaDB FAQ" by andrew_kilburn_g. Please answer it at http://mariadb.com/kb/en/mariadb-removes-all-users-on-restart/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- I am new to MariaDB and have set 3 instances up on 3 different servers. I customised the variables using the MySQL MariaDB client and all was well with the world. However, when coming to restart the machine which the MariaDB databases are currently installed on, it set all the variables back to default values. This is very strange and I'm not sure why this has occurred. After some investigating I found that I can set the variables permanently by changing the My.config file. So this is what I did. My MariaDB instance had 2 users, the original root and the new user which I created. When I restarted the machine after changing the config file by only adding 3 variables, I found that it removed both users and I now cannot connect to MariaDB using any of the users which have been created. I've done this on two machines and now I only have access to one! Why is this? Is this some sort of bug? How am I supposed to get back in? -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/mariadb-removes-all-users-on-restart/

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[Maria-discuss] question on semisync
by Qiang Tian 03 Mar '16

03 Mar '16

Hi guys, Do we have enhancement like mysql worklog 6630( http://dev.mysql.com/worklog/task/?id=6630) I did not see it in 10.1 release note.. thanks a lot! Qiang

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[Maria-discuss] Galera crash - [ERROR] Slave SQL: Error 'Can't create table (errno: 150)' on query. Default database: . Query: 'CREATE TABLE'
by Lukas Lehner 02 Mar '16

02 Mar '16

Hi http://dba.stackexchange.com/questions/130307/galera-crash-error-slave-sql-… any idea? howto debug future crashes better? Lukas

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[Maria-discuss] New Question: Error installing AUDIT Plugin in MySQL 5.7
by AskMonty KB 02 Mar '16

02 Mar '16

Hello, A new question has been asked in "MariaDB Community" by sanjaykumar.raghavendra. Please answer it at http://mariadb.com/kb/en/error-installing-audit-plugin-in-mysql-57/ as the person asking the question may not be subscribed to the mailing list. -------------------------------- I downloaded mariadb-10.1.11 for Linux x86-64 and copied the auth_pam.so to plugin directory under MySQL 5.7.10 Community Server home directory. When I attempt to install the plugin I get the following error mysql> install soname 'auth_pam'; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'soname 'auth_pam'' at line 1 Then I tried the following but no luck mysql> install plugin auth_pam_server soname 'auth_pam.so'; ERROR 1127 (HY000): Can't find symbol '_mysql_plugin_interface_version_' in library mysql> install plugin pam soname 'auth_pam.so'; ERROR 1127 (HY000): Can't find symbol '_mysql_plugin_interface_version_' in library Do I need to do anything additional for this to work? -------------------------------- To view or answer this question please visit: http://mariadb.com/kb/en/error-installing-audit-plugin-in-mysql-57/

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[Maria-discuss] new jira: missing redirect
by Federico Razzoli 29 Feb '16

29 Feb '16

Hi! I see that MariaDB switched to the new JIRA. However this redirect has not been updated: http://mariadb.org/jira Regards Federico

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[Maria-discuss] Fwd: New Question: Non-blocking calls from PHP
by Justin Swanhart 27 Feb '16

27 Feb '16

oops, didn't copy the list. ---------- Forwarded message ---------- From: Justin Swanhart <greenlion(a)gmail.com> Date: Wed, Feb 24, 2016 at 11:34 AM Subject: Re: [Maria-discuss] New Question: Non-blocking calls from PHP To: Federico Razzoli <federico_raz(a)yahoo.it> Hi, For now, if you want FIFO, just change the ORDER BY q_id DESC to ORDER BY q_id. The execution is parallel, it shouldn't starve queries. I will probably change this anyway by changing the structure of the `q` table to have a primary key that sorts by the completion status and a unique key for the auto_increment columns, then it can naturally be FIFO without causing lock contention due to locking scanned rows in InnoDB. The workaround for GET DIAGNOSTICS is to change it to not use that and just put a generic error in the table. You can't use conditional version syntax in stored procs, and I don't want to have two different versions of the script, since everyone really should be using 5.6+ or MariaDB 5.5+ IMHO. I will remove count_running_threads, it isn't really needed because the metadata locks held by the stored proc enforce that no more than 'thread_count' threads can run. I will remove that code shortly. I wasn't using metadata locks when I started writing the tool. This will remove the dependency on global variables and the processlist. It is version 1.0 and is still experimental :) Thank you for the feedback. --Justin On Wed, Feb 24, 2016 at 10:58 AM, Federico Razzoli <federico_raz(a)yahoo.it> wrote: > Yes, GET DIAGNOSTICS is in 5.5 (and anyway, a workaround for older > versions should be possible, correct?). > > Some comments: > > 1) The LIFO tables sounds to me a little dangerous. Of course > "asynchronous" means "asynchronous", but under certain circumstances some > queries could wait too much... don't you agree? Maybe the direction could > depend from an option... > > 2) SELECT queries are "materialized", which is cool. But I don't > understand how the user can associate an async query with the results table. > > 3) In MariaDB, the P_S is disabled by default, and a user can still > disable it in MySQL. Also, in MariaDB global_status is in I_S, while MySQL > has it in P_S (another funny incompatibility developed by Oracle). The > first problem can probably be addressed with CONNECT (SRCDEF='show > processlist') and the second with a view in async schema. Would you accept > a patch? > > Probably more comments/questions will come. In the meanwhile, thanks for > your work (again). > > bye > Federico > > > -------------------------------------------- > Mer 24/2/16, Justin Swanhart <greenlion(a)gmail.com> ha scritto: > > Oggetto: Re: [Maria-discuss] New Question: Non-blocking calls from PHP > A: "Federico Razzoli" <federico_raz(a)yahoo.it> > Cc: "Maria Discuss" <maria-discuss(a)lists.launchpad.net> > Data: Mercoledì 24 febbraio 2016, 16:04 > > Hi, > It is > completely native. It consists of a queue table, a thread > state table, a settings table, a stored procedure worker, an > event to execute the worker (more than one run in parallel) > and procs to drop off, check on, and get the results of a > SQL statement (which always waits if the SQL is not done > yet). > I don't know > if MariaDB 5.5 or 10 adds GET DIAGNOSTICS, but it will work > with any version that has it. You can comment that out and > just put a generic error into the table if it isn't > supported, and it will work with any version that has > SIGNAL. > --Justin > On Wed, Feb 24, 2016 at > 10:01 AM, Federico Razzoli <federico_raz(a)yahoo.it> > wrote: > Hi > Justin! > > The name reminds me a a fatal trap for developers and sys > admins (async npm module), but the tools sounds useful. > > Is it publicly available? Is it entirely implemented via > stored procedures + event scheduler? > > > > bye > > Federico > > > > > > -------------------------------------------- > > Mer 24/2/16, Justin Swanhart <greenlion(a)gmail.com> > ha scritto: > > > > Oggetto: Re: [Maria-discuss] New Question: Non-blocking > calls from PHP > > A: "AskMonty KB" <noreply(a)askmonty.org> > > Cc: "Maria Discuss" <maria-discuss(a)lists.launchpad.net> > > Data: Mercoledì 24 febbraio 2016, 15:32 > > > > Replying > > here in addition to the web page (ugh > Frankenstein's > > monster)... > > > > I just finished > > the first version of 'async' which runs queries > in > > the background (in parallel!) using a queue table, a > crafty > > stored procedure for a worker thread, and an event > which > > executes the workers. > > http://swanhart.livejournal.com/138754.html > > > > On Sun, Feb 21, 2016 at > > 8:55 AM, AskMonty KB <noreply(a)askmonty.org> > > wrote: > > Hello, > > > > > > > > A new question has been asked in " MariaDB > Connector/C > > API Functions" by shestero. Please answer it at > http://mariadb.com/kb/en/non-blocking-calls-from-php/ > > as the person asking the question may not be subscribed > to > > the mailing list. > > > > > > > > -------------------------------- > > > > I want to use non-blocking API ( > https://mariadb.com/kb/en/mariadb/non-blocking-api-reference > > ) from PHP. > > > > Is it possible now? > > > > If no, can anybody give me directions how to implement > my > > own PHP-extension in C (using Connector/C) or update > the > > existing module? I don't think it's very complex, > do > > I need to add just wraper-like implementations using > > blocking function as samples, don't I? > > > > -------------------------------- > > > > > > > > To view or answer this question please visit: > http://mariadb.com/kb/en/non-blocking-calls-from-php/ > > > > > > > > _______________________________________________ > > > > Mailing list: https://launchpad.net/~maria-discuss > > > > Post to : maria-discuss(a)lists.launchpad.net > > > > Unsubscribe : https://launchpad.net/~maria-discuss > > > > More help : https://help.launchpad.net/ListHelp > > > > > > > > -----Segue allegato----- > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~maria-discuss > > Post to : maria-discuss(a)lists.launchpad.net > > Unsubscribe : https://launchpad.net/~maria-discuss > > More help : https://help.launchpad.net/ListHelp > > >

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