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Re: [Maria-discuss] MariaDB Server 10.3 notes
by Federico Razzoli 15 Oct '16

15 Oct '16

A lot of things don't run on Windows: Galera, Percona Toolkit, Xtrabackup... Is this really a problem for MySQL users? Federico -------------------------------------------- Sab 15/10/16, Reindl Harald <h.reindl(a)thelounge.net> ha scritto: Oggetto: Re: [Maria-discuss] MariaDB Server 10.3 notes A: maria-discuss(a)lists.launchpad.net Data: Sabato 15 ottobre 2016, 19:10 Am 15.10.2016 um 17:22 schrieb Tim Callaghan: > Every time the topic of getting TokuDB to run on Windows the developers > could not have run out of the room any faster. :) frankly what is the purpose of running MySQL/MariaDB on Windows? who does that in production? for development? seriously? develop a application on Windows which finally runs on a different OS? not in 2016 when anybody sane in his mind would setup a virtual machine so that his testing servers are really reflecting the later production environment (for the poor guys which are running Windows on their bare metal development machine) _______________________________________________ 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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[Maria-discuss] Reg replication and commit
by Karthick Subramanian 14 Oct '16

14 Oct '16

Hi All, I have the below topology: Master -> Slave (using GTID replication) Master -> Maxscale (Binlog Router) Maxscale -> DR Site (via binlog router) my.cnf is same across all sites: lower-case-table-names=1 autocommit=0 #replication variables log-bin=binlog binlog-format=ROW replicate_annotate_row_events=OFF binlog_annotate_row_events=OFF I have created a table and I could see on slave DB as well as at DR Site DB. When I INSERT records, this is not shown up in Slave DB as well DR Site DB. I have checked replication status and both are sync with master server binlog pos. But the rows reflected in slave and DR site DB only when we COMMIT on both Slave as well DR site DB. Below when I try at Slave DB: MariaDB [dr_repl]> select * from test_dr_repl; Empty set (0.00 sec) MariaDB [dr_repl]> commit; Query OK, 0 rows affected (0.00 sec) MariaDB [dr_repl]> select * from test_dr_repl; +----+------+ | id | val | +----+------+ | 1 | 1 | | 2 | 2 | | 3 | 3 | +----+------+ 3 rows in set (0.00 sec) I am wondering whether I did any weird mistake. Could anyone please help me to understand and a solution for this. Regards, Karthick

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Re: [Maria-discuss] MariaDB Server 10.3 notes
by Federico Razzoli 14 Oct '16

14 Oct '16

Hi all, So basically everyone would love, love, love to have external languages for stored procedures, but no one is working on it... so bad. Please consider something: 1- Some features could be implemented as stored procedures, it's much easier. This has been done in the past (Flexviews, Securich...) but SQL is too limited. 2- I am sure that a lot of people would implement procedures libraries if they could use something like JavaScript or PHP. If we could use Python, stuff like NumPy and SciPy could be used. 3- SQL limitations could be lifted (namespaces for global objects, arrays, argv, cursors based on a prepared statement...) but will you ever do it? Probably not. But if we have external languages, who cares about procedural SQL limitations. I believe that next releases features are selected based on their cost (not only that of course). But please consider points 2 and 3, and try to estimate the cost of features that the community can develop for you, plus the cost of features that won't be really needed anymore if external languages are available (arrays in SQL). Cheers Federico -------------------------------------------- Mer 12/10/16, Sergei Golubchik <serg(a)mariadb.org> ha scritto: Oggetto: Re: [Maria-discuss] MariaDB Server 10.3 notes A: "Justin Swanhart" <greenlion(a)gmail.com> Cc: "Maria Discuss" <maria-discuss(a)lists.launchpad.net> Data: Mercoledì 12 ottobre 2016, 14:15 Hi, Justin! Very good questions, thanks! Some answers below: On Oct 12, Justin Swanhart wrote: > > > * InnoDB: InnoDB native partitioning - so MySQL 8 InnoDB? But Monty > > says there's next to no changes in InnoDB 8... Instant add column. > > New InnoDB deadlock detection (8.0). New INFORMATION_SCHEMA table > > (8.0). Dedicated tablespace for temporary tables (in 5.7 and merged, > > check). Lock wait policy (contribution) > > Monty is *notorious* for low balling estimates. His famous phrase is "it > is trivial". Everybody knows that if Monty says it is trivial, you can add > 10x the work to get it done, or more. Yes, I tend to agree with that. But Monty estimates are not that far off when applied to *Monty*. They're often too low when applied to others. https://www.google.de/search?q=10x+developer > includes transportable tablespaces for partitioned tables, and will likely > support native partitioning by the time 8 rolls. Native partitioning also > entails implementing the changes to the SE. See: > http://mysqlserverteam.com/innodb-native-partitioning-early-access/ InnoDB native partitioning is in 5.7.6: https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-6.html Is it better than upper-layer partitioning? Why? > > * more for window functions (user defined window functions, MDEV-10855) > What other databases have user definable window functions? Will the syntax > be similar? I can't really think of a reason to need custom window > functions personally, as the existing set is very comprehensive. What kind > of custom window function do you think people would need to write? In most > implementations any aggregate functions can be used in a window frame > context, thus any aggregate SQL functions should satisfy requirements for > user defined window funcs. Yes, that was a confusing description. What it really means - we will have aggregate SQL functions (MDEV-7773) and preferrably, it should be possible to make them window-aware. Using an aggregate function as a window function, means applying it to every possible position of a sliding frame, and it has O(N*n) complexity (where N is total number of rows, n is the number of rows in the frame). If the aggregate function can remove rows from a group, it will only be O(N). > > * socket authentication > Can you explain this. Is there an MDEV? That's using unix_socket authentication by default for the root user. It improves security and maintainability, but is not really new - Debian is already doing that for months. This change could be confusing and break exising user scripts, so it needs to be done with care. > > * X Protocol/Document store - only if people have time or money will > > it be done > If you want people to pay for it, perhaps you should implement it in > MaxScale instead of the server :) Interesting idea :) But the MariaDB Meetup is a community event organized by the MariaDB Foundation. This particular session was about MariaDB Server planning. MariaDB Foundation has nothing to do with MaxScale, so we could not have planned anything for it. > >* Peter asks if there is any plans to support other languages like V8? > PLEASE PLEASE PLEASE PLEASE IMPLEMENT WL-820. External stored procs and > table functions. Been sitting there for the taking for a long time. > Antony has tried to get you to get it into the server, but alas, it has > never happened, and though there continues to be wide requests for this > feature from the community, they fall on deaf ears. Frankly speaking, I'd love it. But this feature never got enough priority, not in MySQL times nor in MariaDB. Unfortunately. Perhaps we'll be able to sneak it into 10.3, but no promises here. > > * Compressed binary log (from Tencent) > Compressing the binary log saves on space on the master, but it makes > seeking into binary logs much more difficult, and searching backwards > through them becomes much more difficult (which has implications for query > 'rewind') Tencent compresses individual events (think Compressed_query_log_event type). So seeking works as before, events are not decompressed on reading, they are sent compressed to slaves, etc. But the compression ratio is worse, of course. > > * Fix the XA transaction bug ( MySQL has fixed it already ) - MDEV-7974 > Please actually complete XA support, don't just half fix it like Oracle > did. Add full support for XA SUSPEND and XA RESUME and allow more than one > thread to participate in a distributed transaction in the server. Right. Still, MDEV-7974 is an important step, we cannot have proper XA without it. XA SUSPEND and XA RESUME should be the next one, I agree. > > * Indexes on expressions (this is part of virtual columns, will it not > > go into 10.2? Check with Serg) > Indexes on expressions requires parser support. > create index expr_idx on some_table(a + b); > select * from some_table where a+b > 30 and a+b <= 50 -- (uses range over > expr_idx) Right, but the parser support is the least of my worries. I don't want to low ball estmates :) but the *parser* can be fixed in a few hours. The most tricky part will be to fix the optimizer. > > * Flashback DDL MDEV-10571 (flashback DML will come in 10.2). It only > > works with row based replication. Talk about what to name it. There's > > already a MySQL time machine on github. Many like the name Rewind (but > > not Monty). Let's do a poll on the mailing list > Okay, Flashback query is VERY complicated. A flashback query is a > materialized view. There are two ways generally to achieve flashback: > a) materialize the query as is, and instead of rolling the query forward > incrementally, you roll it backwards. Flexviews achieves this by computing > the query as it is now, then computing the delta from a prior point in time > until the transaction in which that computation happened. Then the delta is > played back against the query, but the MONUS of each operation is applied > which changes insertions to deletions and vice versa. This still presents > a problem for OUTER JOIN. No documented asynchronous refresh algorithms > exist for outer join that I'm aware of, that would work with the concept of > reading row history from serialized changes. Flexviews uses the "rolling > join propagation" algorithm, which only works with inner joins. Interesting... I'll continue reading on that, thanks. But see below > b) provide a point-in-time snapshot of every table used in the query at the > desired point in time, and run the query over those tables (this is a > synchronous mechanism which supports OUTER JOIN). The problem here is how > to provide such a table. The most straight-forward way is to copy the > table, and then do the backwards replay for each (ideally in parallel) but > this is obviously undesirable if the query is "select * from some_big_table > join another_big_table on (...)" because you have to fully copy each table > before you can undo changes. Otherwise you need to have the SE display old > versions, just like it does for MVCC, but it has to display versions from > binary logs, not undo logs, and this requires a lot of SE and engine > changes! This is about correct. There are different applications for "flashback" with different use cases and different implementation trade-offs. One is, for example, to see historical sales numbers, for different months or years. That is, basically, for some kind of data analytics. Lots of SELECT queries, ad-hoc queries, at different historical time points. Another one is "damn, I've made a typo in a WHERE clause and updated too much". In this case one doesn't need joins or materialized views, one needs to see the data before the erroneous statement. This is not used often. For the second use case one can afford to copy tables and backward-replay the binary log. For the first use case one would need a completely different approach, I agree. May be something like what Flexviews does. > If you are going to have generic flashback, you might as well commit to > incrementally refreshable materialized views. Right, when we'll have materialized views, than we could think about incrementally updating them using rolling join propagation. > > * Additional GIS functions to stay compatible. Also it would be good > > to have a standalone GIS library (Georg suggests; wlad isn't too happy > > with the suggestion). Georg suggests that calculations should use the > > reference systems (Unflatten the world - MariaDB Server GIS the world > > looks flat) > > GIS functions should use gdal, just like postgresql does. Then you can > also add support for rasters. Here is an example of the awesomeness of > postgresql and postgis. It uses SQL aggregate functions, table functions, > CTE, GIS raster functions, sequences, etc: > https://github.com/greenlion/osmvox/blob/master/postgresql/combined_schema.… May be. On the other hand, we're more precise that postgis, because our implementation uses fixed-point math, not doubles. And let's not forget that MySQL uses Boost::Geometry. > > * Query rewriting - MDEV-5561 > I would like you to provide a SQL->DOM function call instead of just > providing a DOM to plugins. This function could be exposed as a regular > item function as well so that anything in the server can parse SQL. I > suggest you implement my SQL "shim" interface and just provide some way to > get a easy to iterate over parsed data structure from the SQL, such as a > nested JSON array of objects. A nested array is generated by > PHP-SQL-Parser and would provide a good template for such a JSON object. > https://github.com/greenlion/PHP-SQL-Parser We actually have an MDEV for that :) > > * With MyRocks coming, should we drop TokuDB (and maybe even deprecate > > in 10.2?) - bugs that MariaDB Corporation reports to Percona don't > > seem to get fixed. Peter says that bugs are fixed for customers... and > > there is ongoing development to make it better > It is certainly disheartening that Percona isn't responsive to MariaDB > bugs, but I'm sure you understand that it is hard for a competitor to fix > bugs for another competitor. MariaDB maintains a forked version of > TokuDB. It isn't fair to expect the upstream vendor to fix bugs that your > customers are paying you to support, does it? Perhaps you should pay a > percentage of your support fees for TokuDB issues to Percona, or come to > some other support agreement. Perhaps YOU should make the bug fixes and > submit them to Percona. And we do, look for bug reports I've reported on TokuDB to Percona - with patches :) But, really, Percona *is* fixing TokuDB bugs, it's just that they did a bit of refactoring after getting TokuDB and it took time for it to stabilize. And MariaDB Server has a vanilla TokuDB with almost no changes, we have no plans to fork it. > > * ORDER BY LIMIT optimizer bugs (MDEV-8306) > Oh god, this is a downward spiral every time somebody touches it. > Fixing it correctly requires rewriting the parser, something that > Oracle is undertaking. This didn't have much to do with the parser, and we've refactored that part of the parser in 10.2, so now this has nothing to do with the parser, it's purely the optimizer issue. > What about other new MySQL 8 features? Are you getting rid of the .FRM > nightmare? Are you going to support SET PERSIST? etc? FRM was made purely optional in 10.0 - every storage engine decides for itself whether it uses FRMs or not. May be InnoDB will use FRMs in 10.3, may be it will not. MyISAM most probably will continue use them. SET PERSIST - and this is my personal opinion - this needs to be thought over *very* carefully. There have been quite a few security vulnerabilities with my.cnf stored in the datadir, and that's why since 2005 the server no longer reads my.cnf in the datadir. But mysql_safe still does - and there have been new security vulnerabilities *last month*, caused by my.cnf in the datadir. And finally both MySQL (in 5.7?) and MariaDB (in 10.2) stopped reading my.cnf in the datadir for real. So, having my security(a)mariadb.org hat on, I look at SET PERSIST with a lot of suspicion, because it's nothing else than another attempt of storing server configuration information in the datadir and have it writable by the server itself. Regards, Sergei Chief Architect MariaDB and security(a)mariadb.org _______________________________________________ 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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Re: [Maria-discuss] MariaDB Server 10.3 notes
by Justin Swanhart 12 Oct '16

12 Oct '16

Hi Sergei! I moved this back to the mailing list, because of your .FRM explanation, and also because I'd like to explain rasters. A GIS raster is an array of data represented as a raster image. Rasters have "layers" and each layer can have a different measurement in it. It is most commonly used for height maps. The pgsql schema that I sent you is for a personal project of mine that uses Voxel.js (http://voxeljs.com/) to turn real world height maps from the space shuttle (SRTM v3 data) into interpolated 1 meter resolution voxel (minecraft-like, as 1 block = 1 sq meter) landscapes. I intersect the raster data with the GIS data from OSM (open street map) so that I can render buildings, roads, forest areas, rivers, etc, somewhat correctly (overpasses, underhangs, and missing building heights cause significant problems.). The ST_PixelsAsCentroids or ST_PixelsAsPoints can be used to get the specific value for a band in the raster, such as the height in a specific 30sq meter area (for the 1 arcsecond resolution of the SRTM data). I could never do such a thing in MySQL, and that makes me sad :( On Wed, Oct 12, 2016 at 9:34 AM, Sergei Golubchik <serg(a)mariadb.org> wrote: > Hi, Justin! > > On Oct 12, Justin Swanhart wrote: > > > > Regarding SET PERSIST, yes, it has dangers. One of them would be to > > set the buffer pool too large, so I filed a MySQL FR to set the BP to > > the default size if the malloc fails. It can be increased dynamically > > later. But there are many changes that could cause problems. This > > feature has to be managed carefully. Then again, Oracle RDBMS has had > > pfile configuration for well over a decade, and it is functionally > > equivalent to a binary my.cnf in the data dir. > > Right. Personally I fully expect that we will need to suport SET PERSIST > eventually. It's just so convenient. I only said it needs some very > careful thinking - and I was responsible for security(a)mysql.com for ten > years and now for security(a)mariadb.org for six, so I am a bit paranoid > about this :) > > > re: GIS, well, gdal and proj are used by almost every application > > that deals with GIS. What does the extra accuracy get you? Anyway, > > rasters really aren't useful without table functions, as you can't get > > the data from each point without them. > > I don't really know what rasters are. > > And I do not actually *use* GIS, so may be extra accuracy is not useful. > I'd think it might be particularly important for functions like > ST_TOUCHES(). > > I really want MariaDB to have table functions - perhaps we will have > them in 10.3. > > > Some more questions: > > Even though .FRM are optional, that still doesn't necessarily make DDL > > changes atomic, does it? > > If the engine declares FRM optional, then the whole DDL is happening > inside the engine, and it's up to the engine to make it atomic. I > expect that when we'll make FRMs optional for InnoDB, InnoDB DDLs > will be atomic. > > Regards, > Sergei > Chief Architect MariaDB > and security(a)mariadb.org >

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[Maria-discuss] (/usr/include/mysql and libmysqlclient) vs (/usr/include/mariadb libmariadbclient and libmariadb)
by james harvey 11 Oct '16

11 Oct '16

First, let me clarify everything here is MariaDB - nothing actually involving the MySQL code. In Arch Linux, I'm running a MariaDB server and client. I installed the mariadb package, built from the source at: http://ftp.heanet.ie/mirrors/mariadb/mariadb-10.1.18/source/mariadb-10.1.18… This provides: - /usr/include/mysql/* (141 .h files) - /usr/lib/libmysqlclient.so - /usr/lib/libmysqld.so (I see this is for embedding a MariaDB server in an application which I don't need, so I'll ignore that for the rest of my message.) I have C++ applications that will access MariaDB, and I thought I also needed mariadb-connector-c, so I built tag v2.3.1 at https://github.com/MariaDB/mariadb-connector-c This provides: - /usr/include/mariadb/* (40 .h files) - /usr/lib/mariadb/libmariadbclient.a - /usr/lib/mariadb/libmariadb.so Q1 - What's the purpose and difference between libmysqlclient, libmariadbclient, and libmariadb? (Ignoring difference shared vs static library.) Q2 - /usr/include/mysql/mysql.h (from http://ftp.heanet.ie/mirrors/mariadb/mariadb-10.1.18/source/mariadb-10.1.18…) and /usr/include/mariadb/mysql.h (from tag v2.3.1 at from https://github.com/MariaDB/mariadb-connector-c) Are quite similar and have a lot of identical code, but are also way different. I ran into that /usr/include/mysql/mysql.h defines: const char * STDCALL mysql_error(MYSQL * myql); But /usr/include/mariadb/mysql.h defines: char * STDCALL mysql_error(MYSQL *mysql); (Note the missing const on the return value.) I got very confused at this point why the same function is declared in each, why they're different, which I should be using, etc.

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[Maria-discuss] Notes from the session MariaDB Foundation priorities
by Colin Charles 08 Oct '16

08 Oct '16

Hi! These notes were from the last session on Friday, 7 October, at the MariaDB Server Developers meeting in Amsterdam at the Booking.com office, headed by Eric Herman, Board Member of the MariaDB Foundation # MariaDB Foundation priorities ## Goal: foster collaboration 1. Product should be called MariaDB Server (MariaDB is the company, since MariaDB Corporation owns the trademark) * needs some copyediting on the MariaDB Foundation website that needs editing 2. the MariaDB Foundation board majority shouldn't be from MariaDB Corporation. Expect that to be fixed within a week, at least 50:50 -- Monty. Is there a community board member? Monty says Serg, but JF/Eric says this is a conflict of interest. Is there a path for community governance? Serg represents the developers. Board selects its own members, says Otto, and there can be a maximum of 10 board members. Now they will think about a community member. 3. The documentation is on mariadb.com (the The MariaDB Knowledge Base: https://mariadb.com/kb/en/). Monty says the documentation is going to stay on mariadb.com. It is a barrier to contribution, according to Eric. Serg says MariaDB Foundation finds this a priority and is working on it. 4. Twitter/FB accounts are owned by MariaDB Corporation - so there will be a new one created for the MariaDB Foundation / MariaDB Server. The Corporation is going to keep @mariadb 5. Jira says it's licensed to MariaDB Corporation. ## Goal: Priorities for code 1. Steward patches through the integration process 2. Personal engagement when it comes to you asking about patches, features, etc. in Jira or list 3. One MariaDB Server release a year, and Serg stewards that 4. The MariaDB Foundation does not do any paid for work! 5. Security, porting, and packaging is a priority of the MariaDB Foundation (e.g. getting the MariaDB Server to work with clang is important) ## Booking's goal: easy to upgrade/cross-grade between distributions of MySQL/MariaDB Server * Eric says that interoperability is a big deal for Booking * Monty says, all members in the MariaDB Foundation have different priorities, but if it's important for Booking, the MariaDB Foundation will focus on it. Maximum increased MariaDB Server usage - this means the mission statement suggests that there must be interoperability. * JF says, Jira is not supported on MariaDB Server (certified with MySQL 5.6). Increasing adoption will happen if more applications can run with MariaDB Server. * Monty says, MySQL 5.6, should be comparable to MariaDB Server 10.1. And for 10.2 it should be compatible with MySQL 5.7. ## Transparency * Transparency during the development process and technical decision making - Vicentiu thinks we can do better, because a lot of decisions are happening on private channels * The Oracle compat work, it is a project from MariaDB Corporation, and it will be donated to the MariaDB Foundation * Vicentiu says that most of the talk about bugs happen on the MariaDB Corporation Slack channel. Serg says that no one would read them anyway. Monty agrees that having all discussions on server engineering should be on public IRC/lists. Increases transparency but maybe doesn't lower the barrier to participate, says Otto. * (Contributor who’s name I didn’t catch) PostgreSQL does all their discussions on public mailing lists and it really helps. -- Colin Charles, http://bytebot.net/blog/ twitter: @bytebot | skype: colincharles "First they ignore you, then they laugh at you, then they fight you, then you win." -- Mohandas Gandhi

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[Maria-discuss] sharding with mariadb?
by l vic 07 Oct '16

07 Oct '16

I wonder how to use sharding with symmetric replication... Does that mean I have to partition every database instance? Does it work with third-party tools, like Vitess (http://vitess.io/)? Thanks

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[Maria-discuss] Expected release of 10.0.28
by Rhys.Campbell＠swisscom.com 07 Oct '16

07 Oct '16

Hi All, Do we have any estimation of the release of 10.0.28? Regards, Rhys

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[Maria-discuss] thank you -> myrocks in mariadb
by MARK CALLAGHAN 06 Oct '16

06 Oct '16

MyRocks is coming to MariaDB. I think this is great news for MyRocks and the MariaDB community. Thank you. https://jira.mariadb.org/browse/MDEV-9658 -- Mark Callaghan mdcallag(a)gmail.com

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[Maria-discuss] possible full-stack idea
by Mark Edwards 04 Oct '16

04 Oct '16

hello - i just joined this list and i apologize in advance if this is not the proper way to ask this question. recently i have had success combining deepstream and sequelize against a JSON column to allow for CRUD functionality in a browser with surprisingly very little code. my hope is to include something like vue, matreshka or even express to have full-stack functionality. before proceeding any further, i thought i should solicit a few opinions on this. currently i have a crude working prototype on github. please let me know any thoughts, concerns or questions before i proceed. Thank you, Mark Edwards

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