An Ambari Service for Solr

Ambari service for easily installing and managing Solr/HdpSearch on both existing HDP clusters or fresh installs via blueprints

Limitations:

• This is not an officially supported service and is not meant to be deployed in production systems. It is only meant for testing demo/purposes
• It does not support Ambari/HDP upgrade process and will cause upgrade problems if not removed prior to upgrade
• Not tested on secured clusters

Steps:

• Download HDP 2.4 sandbox VM image (Hortonworks_sanbox_with_hdp_2_4_vmware.ova) from Hortonworks website
• Import Hortonworks_sanbox_with_hdp_2_4_vmware.ova into VMWare and set the VM memory size to 8GB
• Now start the VM
• After it boots up, find the IP address of the VM and add an entry into your machines hosts file e.g.

192.168.191.241 sandbox.hortonworks.com sandbox    

• Connect to the VM via SSH (password hadoop) and start Ambari server

ssh root@sandbox.hortonworks.com
/root/start_ambari.sh

• To deploy the Solr stack, run below

VERSION=`hdp-select status hadoop-client | sed 's/hadoop-client - \([0-9]\.[0-9]\).*/\1/'`
sudo git clone https://github.com/abajwa-hw/solr-stack.git /var/lib/ambari-server/resources/stacks/HDP/$VERSION/services/SOLR

• Restart Ambari

#on sandbox
sudo service ambari restart

#on non-sandbox
sudo service ambari-server restart

• Then you can click on 'Add Service' from the 'Actions' dropdown menu in the bottom left of the Ambari dashboard:

On bottom left -> Actions -> Add service -> check Solr service -> Next -> Next -> Next -> Deploy

• Also ensure that the install location you are choosing (/opt/solr by default) does not exist

• On successful deployment you will see the Solr service as part of Ambari stack and will be able to start/stop the service from here:

• You can see the parameters you configured under 'Configs' tab

Option 2: Automated deployment of fresh cluster via blueprint

• Bring up 4 VMs imaged with RHEL/CentOS 6.x (e.g. node1-4 in this case)

• On non-ambari nodes, install ambari-agents and point them to ambari node (e.g. node1 in this case)

export ambari_server=node1
curl -sSL https://raw.githubusercontent.com/seanorama/ambari-bootstrap/master/ambari-bootstrap.sh | sudo -E sh

• On Ambari node, install ambari-server

export install_ambari_server=true
curl -sSL https://raw.githubusercontent.com/seanorama/ambari-bootstrap/master/ambari-bootstrap.sh | sudo -E sh
yum install -y git
git clone https://github.com/abajwa-hw/solr-stack.git /var/lib/ambari-server/resources/stacks/HDP/2.3/services/SOLR

• Ensure Solr is only started after Zookeeper
  • Edit the /var/lib/ambari-server/resources/stacks/HDP/2.3/role_command_order.json file to include below:

"SOLR_MASTER-START" : ["ZOOKEEPER_SERVER-START"],

• Ensure that by default, Solr is started on multiple nodes (3 in this example)
  • Edit the /var/lib/ambari-server/resources/stacks/HDP/2.0.6/services/stack_advisor.py file from:

  def getMastersWithMultipleInstances(self):
    return ['ZOOKEEPER_SERVER', 'HBASE_MASTER']      

  def getCardinalitiesDict(self):
    return {
      'ZOOKEEPER_SERVER': {"min": 3},
      'HBASE_MASTER': {"min": 1},
      }

to:

  def getMastersWithMultipleInstances(self):
    return ['ZOOKEEPER_SERVER', 'HBASE_MASTER','SOLR_MASTER']

  def getCardinalitiesDict(self):
    return {
      'ZOOKEEPER_SERVER': {"min": 3},
      ’SOLR_MASTER': {"min": 3},
      'HBASE_MASTER': {"min": 1},
      }
      

• Restart Ambari

service ambari-server restart
service ambari-agent restart    

• Confirm 4 agents were registered and agent remained up

curl -u admin:admin -H  X-Requested-By:ambari http://localhost:8080/api/v1/hosts
service ambari-agent status

• (Optional) - Generate Ambari Blueprint and cluster file using Ambari recommendations API using below steps.
  For more details, on the bootstrap scripts see bootstrap script git

yum install -y python-argparse
git clone https://github.com/seanorama/ambari-bootstrap.git

#optional - limit the services for faster deployment

#for minimal services
export ambari_services="HDFS MAPREDUCE2 YARN ZOOKEEPER HIVE SOLR"

#for most services
#export ambari_services="ACCUMULO FALCON FLUME HBASE HDFS HIVE KAFKA KNOX MAHOUT OOZIE PIG SLIDER SPARK SQOOP MAPREDUCE2 STORM TEZ YARN ZOOKEEPER SOLR"

export deploy=false
cd ambari-bootstrap/deploy
bash ./deploy-recommended-cluster.bash

• Configure your Solr install by editting /root/ambari-bootstrap/deploy/tempdir*/blueprint.json. For example to include configurations for Ranger audits in Solr make below changes:

    {
      "solr-config": {
        "solr.datadir": "/opt/ranger_audit_server",
        "solr.download.location": "HDPSEARCH",
        "solr.znode":"/ranger_audits"
        }  
    },
    {
      "solr-env": {
        "solr.port": "6083"
        }
    },

• Register Bluprint

curl -u admin:admin -H  X-Requested-By:ambari http://localhost:8080/api/v1/blueprints/recommended -d @blueprint.json

• Deploy Blueprint

curl -u admin:admin -H  X-Requested-By:ambari http://localhost:8080/api/v1/clusters/solrCluster -d @cluster.json

Use Solr

• Lauch the Solr webapp via navigating to http://sandbox.hortonworks.com:8983/

• Alternatively, you can launch it from Ambari via iFrame view

• Create a test collection. The below creates a collection names testCollection with 1 shard and replication factor of 1, but you can repeat as necessary

export JAVA_HOME=<JAVA_HOME>

/opt/lucidworks-hdpsearch/solr/bin/solr create -c testCollection \
   -d data_driven_schema_configs \
   -s 1 \
   -rf 1 

• Once the collection is created, you can view the graph of all collections in Solr Ui under Cloud > Graph. Here is a sample screenshot showing 3 collections with multiple shards

• Now that you have Solr running you can try some of the tutorials from HCC e.g.

  • https://community.hortonworks.com/articles/1160/index-documents-using-hdpsearch-in-hdp-23.html

• One benefit to wrapping the component in Ambari service is that you can now monitor/manage this service remotely via REST API

export SERVICE=SOLR
export PASSWORD=admin
export AMBARI_HOST=sandbox.hortonworks.com
export CLUSTER=Sandbox

#get service status
curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X GET http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

#start service
curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Start $SERVICE via REST"}, "Body": {"ServiceInfo": {"state": "STARTED"}}}' http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

#stop service
curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Stop $SERVICE via REST"}, "Body": {"ServiceInfo": {"state": "INSTALLED"}}}' http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

Remove Solr service

• To remove the Solr service:
  • Stop the service via Ambari
  • Delete the service

export SERVICE=SOLR
export PASSWORD=admin
export AMBARI_HOST=sandbox.hortonworks.com
export CLUSTER=Sandbox    
curl -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X DELETE http://$AMBARI_HOST:8080/api/v1/clusters/$CLUSTER/services/$SERVICE

• Remove artifacts

  rm -rf /var/lib/ambari-server/resources/stacks/HDP/2.2/services/solr-stack
  rm -rf /opt/solr
  

• Restart Ambari

  service ambari restart