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package YARN; |
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# TODO: Write better/more test cases |
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use 5.006; |
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use strict; |
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use warnings; |
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use REST::Client; |
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use JSON; |
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use Data::Dumper; |
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use YARN::YarnClient; |
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BEGIN { |
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$YARN::VERSION = '0.1'; |
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} |
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our $client = ''; |
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my %apis = ( |
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info => 'clusterInfo', |
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metrics => 'clusterMetrics', |
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scheduler => 'scheduler', |
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apps => 'apps', |
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); |
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sub new { |
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my ($this, %opts) = @_; |
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my $self = +{ |
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host => $opts{host} || 'localhost', |
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port => $opts{port} || 8088, |
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endpoint => $opts{endpoint} || '/ws/v1/cluster', |
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}; |
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$client = YARN::YarnClient->createYarnClient( $self ); |
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return bless $self, $this; |
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} |
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# TODO: Rename below method to something meaningful |
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sub __req_api { |
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my ($self, $api, $element) = @_; |
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my $req = $client->connect( $self ); |
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my $rest = $req->GET( $client->api_path( $self, $api ) )->responseContent(); |
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if (defined $element) { |
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return $self->findElementInJSON( $rest, $apis{$api}, $element ); |
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} else { |
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return $rest; |
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} |
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} |
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sub info { shift->__req_api( 'info', @_ ); } |
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sub metrics { shift->__req_api( 'metrics', @_ ); } |
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sub scheduler { shift->__req_api( 'scheduler', 'schedulerInfo', @_ ); } |
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sub getAllQueues { |
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my $self = shift; |
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my $req = $self->scheduler(); |
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my @queues; |
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$queues[0] = $req->{'queueName'}; |
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push @queues, $self->recurse( $req, 'queues', $req->{'queueName'} ); |
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return @queues; |
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} |
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my @allQueues; |
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sub recurse { |
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my ($self, $req, $element, $parent) = @_; |
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if ( defined $req->{$element} ) { |
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my @queues = @{ $req->{$element}->{'queue'} }; |
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foreach my $queue ( @queues ) { |
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my $queueName = $parent . "." . $queue->{'queueName'}; |
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push @allQueues, $queueName; |
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$self->recurse( $queue, 'queues', $queueName ); |
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} |
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} |
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return @allQueues; |
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} |
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sub getRootQueueInfos { |
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my $self = shift; |
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my $req = $self->scheduler(); |
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} |
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sub findElementInJSON { |
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my ($self, $rest, $root, $element) = @_; |
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my $res = decode_json $rest; |
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return $res->{$root}->{$element}; |
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} |
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108
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=head1 NAME |
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YARN - short for Yet Another Resource Negotiator (or if you prefer recursive acronyms, YARN Application Resource Negotiator). |
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112
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=head2 VERSION |
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114
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Version 0.01 |
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116
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=head1 SYNOPSIS |
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use YARN; |
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120
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my $yarn = YARN->new( host => "hadoop-master.example.com" ); |
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print $client->info('id'); |
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=head1 Methods |
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=head2 Construction and setup |
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=head3 new |
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130
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Construct a new YARN. |
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132
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=head2 ResourceManager REST API's |
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The ResourceManager REST API's allow the user to get information about the cluster - status on the cluster, metrics on the cluster, scheduler information, information about nodes in the cluster, and information about applications on the cluster. |
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136
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=head3 info |
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138
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The cluster information resource provides overall information about the cluster. Use this method to get general information about the cluster. |
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140
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# Returns a JSON String with the elements of the clusterInfo object |
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$client->info(); |
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143
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# Returns the value of an element from the clusterInfo object |
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$client->info('id'); |
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=head3 metrics |
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148
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The cluster metrics resource provides some overall metrics about the cluster. Use this method to get metrics about the cluster. |
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150
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# Returns a JSON String with the elements of the clusterMetrics object |
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$client->metrics(); |
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# Returns the value of an element from the metrics object |
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$client->metrics('totalNodes'); |
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156
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=head3 scheduler |
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158
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A scheduler resource contains information about the current scheduler configured in a cluster. It currently supports both the Fifo and Capacity Scheduler. |
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You will get different information depending on which scheduler is configured so be sure to look at the type information. |
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161
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# TODO: Fix 4 lines below |
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# Returns a JSON String with the elements of the scheduler object |
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$client->scheduler(); |
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165
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# Returns the value of an element from the scheduler object |
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$client->scheduler('XXX'); |
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168
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=head3 apps |
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170
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With the Applications API, you can obtain a collection of resources, each of which represents an application. When you run a GET operation on this resource, you obtain a collection of Application Objects. |
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# Returns a JSON String with the elements of the apps object |
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$client->apps(); |
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# Returns the value of an element from the apps object |
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$client->apps('XXX'); |
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=head3 nodes |
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With the Nodes API, you can obtain a collection of resources, each of which represents a node. When you run a GET operation on this resource, you obtain a collection of Node Objects. |
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Use this method to get a report of all nodes in the cluster. |
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# Returns a JSON String with the elements of the nodes object |
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$client->nodes(); |
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# Returns the value of an element from the nodes object |
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$client->nodes('XXX'); |
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=head3 node |
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A node resource contains information about a node in the cluster. Use this method to get a report of a node in the cluster. |
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# Returns a JSON String with the elements of the node object |
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$client->node(); |
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# Returns the value of an element from the node object |
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$client->node('XXX'); |
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199
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=head3 getAllQueues |
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201
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Returns an array with all queues defined in the scheduler. |
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203
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print Dumper $client->getAllQueues(); |
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$VAR1 = 'root'; |
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$VAR2 = 'root.parent1'; |
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$VAR3 = 'root.parent1.child1'; |
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$VAR5 = 'root.foo'; |
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$VAR6 = 'root.foo.f1'; |
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$VAR7 = 'root.foo.f2'; |
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$VAR8 = 'root.foo.f718'; |
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$VAR9 = 'root.bar'; |
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213
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=head3 getRootQueueInfos |
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215
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Get information about top level queues. |
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217
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=head1 AUTHOR |
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219
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Ahmed Ossama, C<< >> |
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221
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=head1 BUGS |
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223
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Please report any bugs or feature requests to C, or through |
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the web interface at L. I will be notified, and then you'll |
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automatically be notified of progress on your bug as I make changes. |
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=head1 SUPPORT |
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You can find documentation for this module with the perldoc command. |
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perldoc YARN |
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You can also look for information at: |
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=over 4 |
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=item * RT: CPAN's request tracker (report bugs here) |
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L |
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=item * AnnoCPAN: Annotated CPAN documentation |
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L |
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=item * CPAN Ratings |
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L |
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=item * Search CPAN |
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L |
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=back |
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=head1 LICENSE AND COPYRIGHT |
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Copyright 2015 Ahmed Ossama. |
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Licensed under the Apache License, Version 2.0 (the "License"); |
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you may not use this file except in compliance with the License. |
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You may obtain a copy of the License at |
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L |
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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See the License for the specific language governing permissions and |
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limitations under the License. |
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=cut |
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1; # End of YARN |