ElasticSearch is based on popular Apache Lucene search engine library, another popular variant of Lucene is Apache SOLR. I'm attracted towards ElasticSearch dues to it's simplicity in JSON style configuration and data access support, I don't intend this blog to be a comparison on ElasticSearch Vs SOLR but I wanted to share my experience around how simple it was to bring up a two node cluster of ElasticSearch.
SOLR 4.2 now includes advanced support for clustering and data sharding similar to ElasticSearch, SOLR depends on Apache Zookeeper instances for these features, you don't need any additional components for ElasticSearch to support these features. The largest reference implementation of ElasticSearch that I know of is Github which recently migrate from SOLR. Here is an interesting techblog on their experiences with this migration
https://github.com/blog/1397-recent-code-search-outages
Step 1: Download ElasticSearch
Download Elastic Search wget https://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-0.90.0.Beta1.tar.gzStep 2: Setup instances
tar -xvf elasticsearch-0.90.0.Beta1.tar.gz
Rename the instance
mv elasticsearch-0.90.0.Beta1 elastic_inst1
Create another copy for the second instance
cp -R elastic_inst1 elastic_inst2
Step 3: Configure instances
NOTE: This step is not mandatory Elasticsearch is smart enough to auto assign a node name and also discover nodes and add them to a cluster, as a best practice it is recommended to assign node and cluster names
vi elastic_inst1/config/elasticsearch.yml
cluster.name: elasticsearch_dc1
node.name: "elastic_inst1"
vi elastic_inst2/config/elasticsearch.yml
cluster.name: elasticsearch_dc1
node.name: "elastic_inst2"
Step 4: Start the instances
./elastic_inst1/bin/elasticsearch -f
./elastic_inst2/bin/elasticsearch -f
When you start the second instance you should see highlighted messages which indicates that the node was automatically added to the cluster
[2013-03-17 19:23:36,845][INFO ][cluster.service ] [elastic_inst2] detected_master [elastic_inst1][NiEZKK6FSNGuLVNrw_OmbQ][inet[/192.168.0.101:9300]], added {[elastic_inst1][NiEZKK6FSNGuLVNrw_OmbQ][inet[/192.168.0.101:9300]],}, reason: zen-disco-receive(from master [[elastic_inst1][NiEZKK6FSNGuLVNrw_OmbQ][inet[/192.168.0.101:9300]]])
Step 5: Test instances
Hit following URL from browser to check Cluster health
http://localhost:9200/_cluster/health?pretty
You should see similar output
{
"cluster_name" : "elasticsearch_dc1",
"status" : "green",
"timed_out" : false,
"number_of_nodes" : 2,
"number_of_data_nodes" : 2,
"active_primary_shards" : 0,
"active_shards" : 0,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 0
}
Step 6: Shutdown a node or entire cluster
You can run these commands from your favorite browser REST API plugins or through curl from command line
curl -XPOST http://localhost:9200/_cluster/nodes/_shutdown
You should see a similar output
{"cluster_name":"elasticsearch_dc1","nodes":{"NiEZKK6FSNGuLVNrw_OmbQ":{"name":"elastic_inst1"},"JC4FSShJQzOeMtpRUu_6Ng":{"name":"elastic_inst2"}}}
To shutdown an individual instance within the cluster, use following commands
curl -XPOST http://localhost:9200/_cluster/nodes/elastic_inst1/_shutdown
curl -XPOST http://localhost:9201/_cluster/nodes/elastic_inst2/_shutdown
Hi Hari,
ReplyDeletehow does the cluster recognize it's nodes when their located on different machines?
A very detailed write up on this is available here
ReplyDeletehttp://www.elasticsearch.org/guide/reference/modules/discovery/zen/
This comment has been removed by the author.
ReplyDeletehi Oren Orgad
ReplyDeletehow does the cluster recognize it's nodes when their located on different machines?
Ans:
Step 1 go to Config/elasticSearch.yml
add cluster.name= same name in all PC
add node.name = Add Different name in all PC
Start Your elasticSearch
Hit following URL from browser to check Cluster health
http://localhost:9200/_cluster/health?pretty
it Show your a Cluster Status..
Great Article !! It helped me a lot.
ReplyDeleteThis is the way of presentation here.... we like to share this information
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Elasticsearch nodes will find each other via unicast, by default.
ReplyDeletediscovery.zen.ping.unicast.hosts: ["127.0.0.1", "[::1]"]
This is really very nice article which I am searching from long time.
ReplyDeleteThank you..!
What other configurations are required apart from cluster & node names? like host ip or something?
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ReplyDeleteElastic search is a search engine, which is open-source, is broadly distributed over the internet, is fast and scalable, and a great big–data solution with analytics of the database. The search result of ElasticSearch is very fast because rather than searching the text or keyword, it searches the index of the file. It searches the text and index files in different formats, which makes it super-fast.
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