MySQL 5.6 Global Transaction IDs - Use case: (session) consistency

Anzeige

Anzeige

Anzeige

Anzeige

Anzeige

Anzeige

Anzeige

Anzeige

Anzeige

Anzeige

Anzeige

Anzeige

Ulf Wendel, Oracle

MySQL 5.6
Global Transaction Ids
Use case: Consistency
MySQL 5.6, PECL/mysqlnd_ms 1.3

The speaker says...
We need new database cluster-aware APIs in PHP.
Many of us use clusters for availability and performan...

Strong consistency
All nodes have all the latest copies
All cients see the latest (comitted) copies
Synchronous

SET...

The speaker says...
In this presentation a cluster is considered to deliver
strong consistency if all nodes immediately se...

Session consistency
Some nodes have the latest copies
A client reads his latest (comitted) copies
Other clients may re...

The speaker says...
Session consistency ensures that one client will be
able to read all his updates for the duration of a...

Eventual consistency
Nodes may or may not serve the latest copies
Nodes may serve stale copies
Nodes may not have copi...

The speaker says...
An eventual consistent node may or may not serve
the latest copy. In fact, there is no promise that a
...

Are vendors fooling you?
There is no one-fits-all replication solution
The dangers of replication and a solution (Jim Gr...

The speaker says...
I would love to stop talking about consistency. But
replication has limits. Keep on pushing but know t...

PECL/mysqlnd_ms 1.2+ API
Tell the plugin/load balancer what you need!
/* Yes, works with PDO and mysql as well. */
$mysqli...

The speaker says...
Because PECL/mysqlnd_ms is a load balancer at the driver
level, it can be controlled not only through ...

Global transaction identifier
Combination of server id and sequence number
Emulation: PECL/mysqlnd_ms 1.2, MySQL Proxy
...

The speaker says...
A global transaction identifier is a cluster-wide
unique transaction identifier. MySQL 5.6 can generat...

MySQL Replication: strong con.
With or without GTID: primary only
Only the primary has all comitted transactions

Cl...

The speaker says...
Configuring PECL/mysqlnd_ms for use with a MySQL
Replication cluster and calling mysqlnd_ms_set_qos($c...

MySQL Replication: session con.
Use GTID to find „synchronous“ slave
Check slave status using SQL
Reduce read ...

The speaker says...
Global transaction identifier help to find „up-to-date“
slaves that have already replicated the latest...

MySQL Replication: eventual c.
With or without GTID: all slaves
Optional QoS level: upper slave lag limit
MySQL estima...

The speaker says...
A MySQL Replication slave is eventual consistent – it
may or may not have the latest updates. There is...

Slave selection logic
Same logic whenever slaves are to be filtered
applied for: session consistency + GTID
applied fo...

The speaker says...
Whenever PECL/mysqlnd_ms has to check the slave status
for filtering slaves, the check is done in two ...

Stateless and shared-nothing
PECL/mysqlnd_ms is a PHP solution
Stateless: decisions are not „remembered“
Shared-nothin...

The speaker says...
Please recall, that we are talking about a PHP integrated
solution. By default PHP is stateless and pr...

THE END

Contact: ulf.wendel@oracle.com

SlideShare teilen

Facebook
Twitter
LinkedIn

Einbetten

Größe (px)

Ähnliche SlideShares am Ende anzeigen

WordPress-Shortcode

Link

Teilen
E-Mail

MySQL? Load? Clustering! Balancing!... by Ulf Wendel 8582 views
HTTP Plugin for MySQL! by Ulf Wendel 98045 views
MySQL Group Replication by Ulf Wendel 35079 views
Cloud os and management overview ... by ☁️Carl Nakamura [... 821 views
Model based transaction-aware cloud... by Leonid Grinshpan,... 1238 views
SaaS Model in economic downturn by Jitendra Maan 925 views

Am meisten geclippte Folie

Auf SlideShare anzeigen

1 von 25 Anzeige

1 von 25 Anzeige