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10 Newer Entries Showing entries 31 to 40 of 712 10 Older Entries

Displaying posts with tag: Replication (reset)

Refactoring replication topologies with Pseudo GTID: a visual tour
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Orchestrator 1.2.1-beta supports Pseudo GTID (read announcement): a means to refactor the replication topology and connect slaves even without direct relationship; even across failed servers. This post illustrates two such scenarios and shows the visual way of mathcing/re-synching slaves.

Of course, orchestrator is not just a GUI tool; anything done with drag-and-drop …

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Orchestrator 1.2.1 BETA: Pseudo GTID support, reconnect slaves even after master failure
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orchestrator 1.2.1 BETA is released. This version supports Pseudo GTID, and provides one with powerful refactoring of one's replication topologies, even across failed instances.

Depicted: moving a slave up the topology even though …

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Refactoring replication topology with Pseudo GTID
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This post describes in detail the method of using Pseudo GTID to achieve unplanned replication topology changes, i.e. connecting two arbitrary slaves, or recovering from a master failure even as all its slaves are hanging in different positions.

Please read Pseudo GTID and Pseudo GTID, RBR as introduction.

Consider the following case: the master dies unexpectedly, and its three slaves are all hanging, not necessarily at same binary log …

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Pseudo GTID, Row Based Replication
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This post continues Pseudo GTID, in a series of posts describing an alternative to using MySQL GTIDs.

The solution offered in the last post does not work too well for row based replication. The binary log entries for the INSERT statement look like this:

# at 1020
# at 1074
#141020 12:36:21 server id 1  end_log_pos 1074  Table_map: `test`.`pseudo_gtid` mapped to number 33
#141020 12:36:21 server id 1  end_log_pos 1196  Update_rows: table id 33 flags: STMT_END_F

BINLOG '
lddEVBMBAAAANgAAADIEAAAAACEAAAAAAAEABHRlc3QAC3BzZXVkb19ndGlkAAMDBw8CQAAE …
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MySQL Crash-safe replication, Binlog Servers and Percona Live London
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I just publish a post on the Booking.com blog: http://blog.booking.com/better_crash_safe_replication_for_mysql.html  Spoiler: it uses Binlog Servers.

This is also the opportunity to tell you that I will be at Percona Live London at the beginning of November, and that I will give a talk about Binlog Servers:  …

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Making UUID() and RAND() replication safe
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MySQL's UUID() and RAND() functions both provide with (pseudo) indeterministic result. UUID()'s result is moreover bound to the host on which it executes. For this reason, both are unsafe to replicate with STATEMENT binlog format. As an example, consider:

master> create table test.uuid_test (id int, u varchar(64));

master>
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MySQL 5.7.5-labs: Multi-source Replication
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Multi-source replication for MySQL has been released as a part of 5.7.5-labs-preview
downloadable from labs.mysql.com. It is one among the several features that are
cooking in the replication technologies at MySQL.  (For a birds eye view of all
replication features introduced in 5.7 and labs, look  at the blog posts here and …


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orchestrator 1.1.18: new features, support for orchestrator-agent
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Outbrain's orchestrator 1.1.18 is released:

  • Support for orchestrator-agent (see announcement): agent pages, support for agent actions, initiation of seeds (provisioning of new/corrupted servers), auditing of seeds.
  • Clusters dashboard
  • Support for long …
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Announcing orchestrator-agent
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orchestrator-agent is a side-kick, complementary project of orchestrator, implementing a daemon service on one's MySQL hosts which communicates with and accepts commands from orchestrator, built with the original purpose of providing an automated solution for provisioning new or corrupted slaves.

It was built by Outbrain, with Outbrain's specific use case in mind. While we release it as open source, only a …

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Exorcising the CAP Demon
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Computer science is like an enormous tool box you can rummage through whenever you have a problem to solve. Most of the tools are sturdy and practical, like algorithms for B-trees. Some are also elegant, like consistent hashing in Dynamo. Finally there are some tools that you never quite figure out even after years of reflection. That piece of steel you are looking at could be Excalibur. Or it could be a rusty knife.

The CAP theorem falls into the last category, at least for me.  It was a major topic in the blogosphere a few years ago and Google Trends shows …

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10 Newer Entries Showing entries 31 to 40 of 712 10 Older Entries

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