riak 0,1,2,0,0,2,0,2

Riak is a decentralized datastore from Basho Technologies.

#+SETUPFILE: “doc/basho-doc-style.iorg”

Welcome to Riak.

  • Overview Riak is a distributed, decentralized data storage system.

Below, you will find the “quick start” directions for setting up and using Riak. For more information, browse the following files:

- README:  this file
- LICENSE: the license under which Riak is released
- doc/
    - admin.org: Riak Administration Guide
    - architecture.txt: details about the underlying design of Riak
    - basic-client.txt: slightly more detail on using Riak
    - basic-setup.txt:  slightly more detail on setting up Riak
    - man/riak.1.gz: manual page for the riak(1) command
    - man/riak-admin.1.gz manual page for the riak-admin(1) command
    - raw-http-howto.txt: using the Riak HTTP interface
  • Where to find more

Below, you’ll find a basic introduction to starting and using Riak as a key/value store. For more information about Riak’s extended feature set, including MapReduce, Search, Secondary Indexes, various storage strategies, and more, please visit our docs at http://docs.basho.com/.

  • Quick Start

This section assumes that you have copy of the Riak source tree. To get started, you need to: 1. Build Riak 2. Start the Riak server 3. Connect a client and store/fetch data

** Building Riak

Note: the develop branch currently only supports Erlang R16B02.

Assuming you have a working Erlang (R14B02 or later) installation, building Riak should be as simple as:


** Starting Riak

Once you have successfully built Riak, you can start the server with the following commands:

#+BEGIN_EXAMPLE $ cd $RIAK/rel/riak $ bin/riak start #+END_EXAMPLE

Now, verify that the server started up cleanly and is working:

: $ bin/riak-admin test

Note that the $RIAK/rel/riak directory is a complete, self-contained instance of Riak and Erlang. It is strongly suggested that you move this directory outside the source tree if you plan to run a production instance.

** Connecting a client to Riak

Now that you have a functional server, let’s try storing some data in it. First, start up a erlang node using our embedded version of erlang:

#+BEGIN_EXAMPLE $ erts-/bin/erl -name [email protected] -setcookie riak

Eshell V5.7.4 (abort with ^G) ([email protected])1> #+END_EXAMPLE

Now construct the node name of Riak server and make sure we can talk to it:

#+BEGIN_EXAMPLE ([email protected])4> RiakNode = ‘[email protected]’.

([email protected])2> net_adm:ping(RiakNode). pong ([email protected])2> #+END_EXAMPLE

We are now ready to start the Riak client:

#+BEGIN_EXAMPLE ([email protected])2> {ok, C} = riak:client_connect(RiakNode). {ok,{riak_client,‘[email protected]’,<<4,136,81,151>>}} #+END_EXAMPLE

Let’s create a shopping list for bread at /groceries/mine:

#+BEGIN_EXAMPLE ([email protected])6> O0 = riak_object:new(<<“groceries”>>, <<“mine”>>, [“bread”]). O0 = riak_object:new(<<“groceries”>>, <<“mine”>>, [“bread”]). {r_object,<<“groceries”>>,<<“mine”>>, [{r_content,{dict,0,16,16,8,80,48, {[],[],[],[],[],[],[],[],[],[],[],[],[],[],…}, {{[],[],[],[],[],[],[],[],[],[],[],[],…}}}, [“bread”]}], [], {dict,1,16,16,8,80,48, {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],…}, {{[],[],[],[],[],[],[],[],[],[],[],[],[],…}}}, undefined}

([email protected])3> C:put(O0, 1).


Now, read the list back from the Riak server and extract the value

#+BEGIN_EXAMPLE ([email protected])4> {ok, O1} = C:get(<<“groceries”>>, <<“mine”>>, 1). {ok,{r_object,<<“groceries”>>,<<“mine”>>, [{r_content,{dict,2,16,16,8,80,48, {[],[],[],[],[],[],[],[],[],[],[],[],…}, {{[],[],[],[],[],[], [[“X-Riak-Last-Modified”,87|…]], [],[],[],…}}}, [“bread”]}], [{“[email protected]@”, {1,63415509105}}], {dict,0,16,16,8,80,48, {[],[],[],[],[],[],[],[],[],[],[],[],[],…}, {{[],[],[],[],[],[],[],[],[],[],[],…}}}, undefined}}

 ([email protected])5> %% extract the value
 ([email protected])5> V = riak_object:get_value(O1).


 Add milk to our list of groceries and write the new value to Riak:

#+BEGIN_EXAMPLE ([email protected])6> %% add milk to the list ([email protected])6> O2 = riak_object:update_value(O1, [“milk” | V]). {r_object,<<“groceries”>>,<<“mine”>>, [{r_content,{dict,2,16,16,8,80,48, {[],[],[],[],[],[],[],[],[],[],[],[],[],[],…}, {{[],[],[],[],[],[], [[“X-Riak-Last-Modified”,87,101,100|…]], [],[],[],[],[],…}}}, [“bread”]}], [{“[email protected]@”, {1,63415509105}}], {dict,0,16,16,8,80,48, {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],…}, {{[],[],[],[],[],[],[],[],[],[],[],[],[],…}}}, [“milk”,“bread”]}

 ([email protected])7> %% store the new list
 ([email protected])7> C:put(O2, 1).


 Finally, see what other keys are available in groceries bucket:

#+BEGIN_EXAMPLE ([email protected])8> C:list_keys(<<“groceries”>>). {ok,[<<“mine”>>]} #+END_EXAMPLE

** Clients for Other Languages

Client libraries are available for many languages. Rather than bundle them with the Riak server source code, we have given them each their own source repository. Currently, official Riak client language libraries include:

** Configuration Configuration for the Riak server is stored in $RIAK/rel/riak/etc directory. There are two files: - vm.args This file contains the arguments that are passed to the Erlang VM in which Riak runs. The default settings in this file shouldn’t need to be changed for most environments.

  • app.config This file contains the configuration for the Erlang applications that run on the Riak server.

More information about this files is available in doc/basic-setup.txt.

** Server Control *** bin/riak This script is the primary interface for starting and stopping the Riak server.

To start a daemonized (background) instance of Riak:

: $ bin/riak start 

Once a server is running in the background you can attach to the Erlang
console via:

: $ bin/riak attach

Alternatively, if you want to run a foreground instance of Riak, start it

: $ bin/riak console

Stopping a foreground or background instance of Riak can be done from a
shell prompt via:

: $ bin/riak stop 

Or if you are attached/on the Erlang console:

: ([email protected])1> q().

You can determine if the server is running by:

: $ bin/riak ping

*** bin/riak-admin This script provides access to general administration of the Riak server. The below commands assume you are running a default configuration for parameters such as cookie.

To join a new Riak node to an existing cluster:

#+BEGIN_EXAMPLE $ bin/riak start # If a local server is not already running $ bin/riak-admin join #+END_EXAMPLE

(Note that you must have a local node already running for this to work)

To verify that the local Riak node is able to read/write data:
: $ bin/riak-admin test

To backup a node or cluster run the following:
: $ bin/riak-admin backup [email protected] riak <directory/backup_file> node
: $ bin/riak-admin backup [email protected] riak <directory/backup_file> all

Restores can function in two ways, if the backup file was of a node the 
node will be restored and if the backup file contains the data for a 
cluster all nodes in the cluster will be restored.

To restore from a backup file:
: $ riak-admin restore [email protected] riak <directory/backup_file>

To view the status of a node:
: $ bin/riak-admin status

If you change the IP or node name you will need to use the reip command:
: $ bin/riak-admin reip <old_nodename> <new_nodename>
  • Contributing to Riak and Reporting Bugs

Basho encourages contributions to Riak from the community. Here’s how to get started.

  • Fork the appropriate sub-projects that are affected by your change. Fork this repository if your changes are for release generation or packaging.
  • Make your changes and run the test suite. (see below)
  • Commit your changes and push them to your fork.
  • Open pull-requests for the appropriate projects.
  • Basho engineers will review your pull-request, suggest changes, and merge it when it’s ready and/or offer feedback.

To report a bug or issue, please open a [[https://github.com/basho/riak/issues][new issue]] against this repository.

You can read the [[http://docs.basho.com/riak/latest/community/bugs/][full guidelines for bug reporting and code contributions]] on the Riak Docs.

** Testing To make sure your patch works, be sure to run the test suite in each modified sub-project, and dialyzer from the top-level project to detect static code errors.

To run the QuickCheck properties included in Riak sub-projects, download QuickCheck Mini: http://quviq.com/index.html NOTE: Some properties that require features in the Full version will fail.

*** Running unit tests The unit tests for each subproject can be run with =make= or =rebar= like so:

#+BEGIN_SRC shell make eunit #+END_SRC

#+BEGIN_SRC shell ./rebar skip_deps=true eunit #+END_SRC

*** Running dialyzer Dialyzer performs static analysis of the code to discover defects, edge-cases and discrepancies between type specifications and the actual implementation.

Dialyzer requires a pre-built code analysis table called a PLT.
Building a PLT is expensive and can take up to 30 minutes on some
machines.  Once built, you generally want to avoid clearing or
rebuilding the PLT unless you have had significant changes in your
build (a new version of Erlang, for example).

**** Build the PLT Run the command below to build the PLT.

#+BEGIN_SRC shell make build_plt #+END_SRC

**** Check the PLT If you have built the PLT before, check it before you run Dialyzer again. This will take much less time than building the PLT from scratch.

#+BEGIN_SRC shell make check_plt #+END_SRC

**** Run Dialyzer

#+BEGIN_SRC shell make dialyzer #+END_SRC

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