elasticsearch-eventhook's Introduction

Elasticsearch Event Hook Pugin

Overview

Event Hook Plugin provides a feature to invoke your script on Elasticsearch Cluster event.

Version

Version	Elasticsearch
master	1.4.X
1.4.0	1.4.0.Beta1
1.3.0	1.3.2

Issues/Questions

Please file an issue. (Japanese forum is here.)

Installation

Install DynaRank Plugin

$ $ES_HOME/bin/plugin --install org.codelibs/elasticsearch-eventhook/1.4.0

Getting Started

Event Hook Plugin invokes your scripts in .eventhook index. A type of .eventhook index is an event name. A script has a type "all" is invoked on all events. Event Hook Plugin uses Elasticsearch script service.

Print All Events

curl -s -XPOST localhost:9200/.eventhook/all/print_event?pretty -d '{
  "priority": 1,
  "lang": "groovy",
  "script": "logger.info(\"[\"+cluster.getLocalNode().name()+\"]:\"+eventType+\" => \"+event.source())",
  "script_type": "inline"
}'

Disable Allocation On Less Than 3 Nodes

The following script is for disappearing a master node:

curl -s -XPOST localhost:9200/.eventhook/routing_table_updater/allocation_disable_on_master?pretty -d '{
  "priority": 1,
  "lang": "groovy",
  "script": "if(nodes.nodeInfo().length<3)cluster.setTransientSettings(\"cluster.routing.allocation.enable\",\"none\")",
  "script_type": "inline"
}'

For disappearing a non-master node:

curl -s -XPOST localhost:9200/.eventhook/zen_disco_node_left/allocation_disable_on_nonmaster?pretty -d '{
  "priority": 1,
  "lang": "groovy",
  "script": "if(nodes.nodeInfo().length<3)cluster.setTransientSettings(\"cluster.routing.allocation.enable\",\"none\")",
  "script_type": "inline"
}'

Specification

Index Mapping

Name	Type	Description
priority	long	a sort order to execute a script. 1 is a high priority.
lang	string	a script language. ex. groovy, native, mvel...
script	string	a script.
script_type	string	a script type. ex. inline, indexded, file.

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