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MaxScale  –  The  Pluggable  Router  Serge Frezefond,

Cloud Solution Architect, SkySQL  

©  SkySQL  Corpora-on  Ab.  Company  Confiden-al.  

MaxScale  Objec-ves  

•  Highly  scalable    •  Transparent  to  the  applica-on  •  Highly  available  •  Extendible  •  Flexible  • Modules  specify  what  MaxScale  is  :  router  /  firewall  /  data  extract  tool  /…  

•  Open  source,  GPL2  soSware  since  8th  of  Jan.  2014  

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How?  In  a  nut  shell  

Core  of  MaxScale  is  mul--­‐threaded,  event-­‐driven  network  IO  processor  

10/06/2014

Client  authen-cates  once  -­‐  with  MaxScale  

Alter,  block  or  log  client  requests  and  results  

Content-­‐aware  or  unaware  routers  

Configura-on  and  state  aware  monitors  

Allows  mul-ple  protocols  for  clients  and  servers  

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Read  Scalability  with  MySQL  Replica-on  using  MaxScale’s  Connec-on  Load  Balancing  

Client  Client   Client   For  applica*ons  that  need  read  scalability  and  load  balancing  and  can  use  separate  connec*ons  for  reads  and  writes.  

Each  client  establishes  one  connec-on  for  writes  and  one  for  reads  

Master   Slave   Slave  

[write service] type=service router=readconnroute router_options=master servers=s1,s2,s3,..,sn

[read service] type=service router=readconnroute router_options=slave servers=s1,s2,s3,..,sn

Slave   Slave  ...

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Consistent  Read  Scalability  with  Galera  using  MaxScale’s  Read/Write  Split  Router  

Client  Client   Client   For  applica*ons  that  require  read  scalability  with  consistent  reads  and  High  Availability  with  fast  failovers.  

MaxScale  selects  one  as    a  master  and  one  or  more  cluster  members  to  slave(s)  

If  node  fails  a  new  master  can  be  chosen  immediately.  

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Query  rewrite  and  filtering  by  using  MaxScale’s  filters  

Client  Client   Client  For  applica*ons  with  mul*ple  different  backend  databases.  For  database  firewalling,  etc.  

CREATE  TABLE  SUPPLIER(ID  INTEGER,  NAME  VARCHAR)  TYPE=INNODB  

[regex] type=filter module=regexfilter match=TYPE replace=ENGINE

CREATE  TABLE  SUPPLIER(ID  INTEGER,  NAME  VARCHAR)  ENGINE=INNODB  

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Query  rewrite  and  filtering  (cont.)  by  using  MaxScale’s  filters  

Client  Client   Client  For  sloppy  administrators  :-­‐)  

Select  count(*)  f0rm  mysql.user  

[regex] type=filter module=regexfilter match=[Ff][Oo0][Rr][Mm] replace=FROM

Select  count(*)  FROM  mysql.user  

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MaxScale  0.7  

●  Galera support ○  Read/Write Split router for Galera Cluster

●  Multiple slaves support

○  Read/Write Split router allows multiple slave connections and balancing load between them

●  Debug Interface enhancements ○  Support for wide variety of MaxScale objects which can be referenced by their names instead of memory

addresses ○  User mode to prevent access by using memory addresses

●  Maintenance mode for servers ●  Configurable monitoring interval ●  Replication Lag Heartbeat Monitor ●  Filters API ●  MariaDB 10 Replication support in MySQL monitor

Release notes: https://github.com/skysql/MaxScale/blob/release-0.7/Documentation/Debug%20And%20Diagnostic%20Support.pdf

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Basic  Setup  

●  Clients  access  MaxScale  ●  MaxScale  in  the  app  server,  

UNIX  sockets  ●  Database  servers  accessed  

via  TCP  

●  Clients  ●  Applica-on  Server  

Database  Cluster  

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Typical  Scenarios  

●  MySQL  Replica-on  with  ●  Read  connec-on  load  

balancing  ●  Read/Write  statement  

splilng  ●  Galera  Cluster  

●  Connec-on  load  balancing  ●  Read/Write  statement  

splilng  ●  Write  conflict  avoidance  

(planned)  

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Inside  MaxScale  MySQL  Local  Authen-ca-on  

Backends Clients

ok

“read user, host” connect/auth

Users  are  loaded  at  start  

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Inside  MaxScale  Read/write  splilng  

“call my_proc(1)”

Master

Slave

Query Classifier

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Inside  MaxScale  Rou-ng  

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Inside  MaxScale  Rou-ng  

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What’s  new  in  R/W  split  router  

●  Session  Commands  ●  Local  variables,  User  change,  

SET  auto  commit  ●  Execute  in  master  &  slave  but  

maintain  execu-on  order  ●  Current  limita-on  :  queries  not  

supported  in  session  commands  

SET  @a=(SELECT  COUNT(*)  FROM  mysql.user)    is  executed  in  both  nodes.  ●  Galera  H/A  Support  

●  Fault  Tolerance  ●  Replica-on  consistency  ●  Transac-on  support  

●  Within  ac-ve  transac-on  everything  is  routed  to  master  

●  Detec-on  of  implicit  BEGIN  and  ROLLBACK/COMMIT  

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What’s  coming  

●  Filters  ●  Rou-ng  hints  ●  Mul-ple  Slave  Support  ●  Weight  based  rou-ng  ●  Backend  failure  tolerance  ●  Enforce  Node  Replica-on  consistency  for  MariaDB  10  &  MySQL  5.6  

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Extending  with  filters  

●  May  be  connected  to  form  arbitrary  chains    ●  Allows  inspec-on,  modifica-on  and  rejec-on  of  requests  and  results  

●  blacklist  ●  data  mining  /  log  

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Get  involved  

●  Check  on  GitHub    hsps://github.com/skysql/MaxScale  ●  MariaDB  Source    hsps://downloads.mariadb.org/  ●  Bugs  report      

hsp://bugs.skysql.com/buglist.cgi?product=Maxscale  ●  Google  groups      

hsps://groups.google.com/forum/#!forum/maxscale  ●  Binary  Tarball      

hsp://downloads.skysql.com/files/SkySQL/MaxScale  ●  SkySQL  website    hsp://www.skysql.com  

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MaxScale  -­‐  Thank  you!