NAME

       Search::Elasticsearch::CxnPool::Sniff - A CxnPool for connecting to a local cluster with a
       dynamic node list

VERSION

       version 5.01

SYNOPSIS

           $e = Search::Elasticsearch->new(
               cxn_pool => 'Sniff',
               nodes    => [
                   'search1:9200',
                   'search2:9200'
               ],
           );

DESCRIPTION

       The Sniff connection pool should be used when you do have direct access to the
       Elasticsearch cluster, eg when your web servers and Elasticsearch servers are on the same
       network.  The nodes that you specify are used to discover the cluster, which is then
       sniffed to find the current list of live nodes that the cluster knows about.

       This sniff process is repeated regularly, or whenever a node fails, to update the list of
       healthy nodes.  So if you add more nodes to your cluster, they will be auto-discovered
       during a sniff.

       If all sniffed nodes fail, then it falls back to sniffing the original seed nodes that you
       specified in "new()".

       For HTTP Cxn classes, this module will also dynamically detect the "max_content_length"
       which the nodes in the cluster will accept.

       This class does Search::Elasticsearch::Role::CxnPool::Sniff and
       Search::Elasticsearch::Role::Is_Sync.

CONFIGURATION

   "nodes"
       The list of nodes to use to discover the cluster.  Can accept a single node, multiple
       nodes, and defaults to "localhost:9200" if no "nodes" are specified. See "node" in
       Search::Elasticsearch::Role::Cxn for details of the node specification.

   See also
       •   "request_timeout" in Search::Elasticsearch::Role::Cxn

       •   "sniff_timeout" in Search::Elasticsearch::Role::Cxn

       •   "sniff_request_timeout" in Search::Elasticsearch::Role::Cxn

   Inherited configuration
       From Search::Elasticsearch::Role::CxnPool::Sniff

       •   sniff_interval

       •   sniff_max_content_length

       From Search::Elasticsearch::Role::CxnPool

       •   randomize_cxns

METHODS

   "next_cxn()"
           $cxn = $cxn_pool->next_cxn

       Returns the next available live node (in round robin fashion), or throws a "NoNodes" error
       if no nodes can be sniffed from the cluster.

   "schedule_check()"
           $cxn_pool->schedule_check

       Forces a sniff before the next Cxn is returned, to updated the list of healthy nodes in
       the cluster.

   "sniff()"
           $bool = $cxn_pool->sniff

       Sniffs the cluster and returns "true" if the sniff was successful.

   Inherited methods
       From Search::Elasticsearch::Role::CxnPool::Sniff

       •   schedule_check()

       •   parse_sniff()

       •   should_accept_node()

       From Search::Elasticsearch::Role::CxnPool

       •   cxn_factory()

       •   logger()

       •   serializer()

       •   current_cxn_num()

       •   cxns()

       •   seed_nodes()

       •   next_cxn_num()

       •   set_cxns()

       •   request_ok()

       •   request_failed()

       •   should_retry()

       •   should_mark_dead()

       •   cxns_str()

       •   cxns_seeds_str()

       •   retries()

       •   reset_retries()

AUTHOR

       Clinton Gormley <drtech@cpan.org>

COPYRIGHT AND LICENSE

       This software is Copyright (c) 2016 by Elasticsearch BV.

       This is free software, licensed under:

         The Apache License, Version 2.0, January 2004