##################### Elasticsearch Configuration Example #####################

# This file contains an overview of various configuration settings,

# targeted at operations staff. Application developers should

# consult the guide at <http://elasticsearch.org/guide>.

#

# The installation procedure is covered at

# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/setup.html>.

#

# Elasticsearch comes with reasonable defaults for most settings,

# so you can try it out without bothering with configuration.

#

# Most of the time, these defaults are just fine for running a production

# cluster. If you're fine-tuning your cluster, or wondering about the

# effect of certain configuration option, please _do ask_ on the

# mailing list or IRC channel [http://elasticsearch.org/community].

# Any element in the configuration can be replaced with environment variables

# by placing them in ${...} notation. For example:

#所有的配置都可以使用环境变量，例如

#node.rack: ${RACK_ENV_VAR}

# For information on supported formats and syntax for the config file, see

# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/setup-configuration.html>

################################### Cluster ###################################

# Cluster name identifies your cluster for auto-discovery. If you're running

# multiple clusters on the same network, make sure you're using unique names.

# 集群名称，默认为elasticsearch

#cluster.name: elasticsearch

#################################### Node #####################################

# Node names are generated dynamically on startup, so you're relieved

# from configuring them manually. You can tie this node to a specific name:

#节点名称，es启动时会自动创建节点名称，但你也可进行配置

#这些名称默认是在es的lib目录下的elasticsearch-1.4..jar文件中的config目录下的names.txt文件中

#node.name: "Franz Kafka"

# Every node can be configured to allow or deny being eligible as the master,

# and to allow or deny to store the data.

#

# Allow this node to be eligible as a master node (enabled by default):

#是否作为主节点，每个节点都可以被配置成为主节点，默认值为true：

#node.master: true

#

# Allow this node to store data (enabled by default):

#是否存储数据，即存储索引片段，默认值为true

#node.data: true

# You can exploit these settings to design advanced cluster topologies.

#当master为false，而data为true时，会对该节点产生严重负荷；

# . You want this node to never become a master node, only to hold data.

#    This will be the "workhorse" of your cluster.

#

#node.master: false

#node.data: true

#当master为true，而data为false时，该节点作为一个协调者；

# . You want this node to only serve as a master: to not store any data and

#    to have free resources. This will be the "coordinator" of your cluster.

#

#node.master: true

#node.data: false

#当master为false，data也为false时，该节点就变成了一个负载均衡器。

# . You want this node to be neither master nor data node, but

#    to act as a "search load balancer" (fetching data from nodes,

#    aggregating results, etc.)

#

#node.master: false

#node.data: false

# Use the Cluster Health API [http://localhost:9200/_cluster/health], the

# Node Info API [http://localhost:9200/_nodes] or GUI tools

# such as <http://www.elasticsearch.org/overview/marvel/>,

# <http://github.com/karmi/elasticsearch-paramedic>,

# <http://github.com/lukas-vlcek/bigdesk> and

# <http://mobz.github.com/elasticsearch-head> to inspect the cluster state.

# A node can have generic attributes associated with it, which can later be used

# for customized shard allocation filtering, or allocation awareness. An attribute

# is a simple key value pair, similar to node.key: value, here is an example:

#每个节点都可以定义一些与之关联的通用属性，用于后期集群进行分片分配时的过滤：

#node.rack: rack314

# By default, multiple nodes are allowed to start from the same installation location

# to disable it, set the following:

#默认情况下，多个节点可以在同一个安装路径启动，如果你想让你的es只启动一个节点，可以进行如下设置：

#node.max_local_storage_nodes: 

#################################### Index ####################################

# You can set a number of options (such as shard/replica options, mapping

# or analyzer definitions, translog settings, ...) for indices globally,

# in this file.

#

# Note, that it makes more sense to configure index settings specifically for

# a certain index, either when creating it or by using the index templates API.

#

# See <http://elasticsearch.org/guide/en/elasticsearch/reference/current/index-modules.html> and

# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/indices-create-index.html>

# for more information.

# Set the number of shards (splits) of an index ( by default):

#设置一个索引库的分片数量，默认值为5：

#index.number_of_shards: 

# Set the number of replicas (additional copies) of an index ( by default):

#设置一个索引库可被复制的数量，默认值为1：

#index.number_of_replicas: 

# Note, that for development on a local machine, with small indices, it usually

# makes sense to "disable" the distributed features:

#当你想要禁用分布式时，你可以进行如下设置：

#index.number_of_shards:

#index.number_of_replicas: 

# These settings directly affect the performance of index and search operations

# in your cluster. Assuming you have enough machines to hold shards and

# replicas, the rule of thumb is:

# 这两个属性的设置直接影响集群中索引和搜索操作的执行。假设你有足够的机器来持有分片和复制品，

#    那么可以按如下规则设置这两个值：

# . Having more *shards* enhances the _indexing_ performance and allows to

#    _distribute_ a big index across machines.

#拥有更多的分片可以提升索引执行能力，并允许通过机器分发一个大型的索引；

# . Having more *replicas* enhances the _search_ performance and improves the

#    cluster _availability_.

#拥有更多的复制器能够提升搜索执行能力以及集群能力。

# The "number_of_shards" is a one-time setting for an index.

#对于一个索引来说，number_of_shards只能设置一次

# The "number_of_replicas" can be increased or decreased anytime,

# by using the Index Update Settings API.

#而number_of_replicas可以使用索引更新设置API在任何时候被增加或者减少

#

# Elasticsearch takes care about load balancing, relocating, gathering the

# results from nodes, etc. Experiment with different settings to fine-tune

# your setup.

# ElasticSearch关注负载均衡、迁移、从节点聚集结果等等。可以尝试多种设计来完成这些功能。

# Use the Index Status API (<http://localhost:9200/A/_status>) to inspect

# the index status.

#可以连接http://localhost:9200/A/_status来检测索引的状态。

#################################### Paths ####################################

# Path to directory containing configuration (this file and logging.yml):

#配置文件所在的位置，即elasticsearch.yml和logging.yml所在的位置：

#path.conf: /path/to/conf

# Path to directory where to store index data allocated for this node.

#分配给当前节点的索引数据所在的位置：

#path.data: /path/to/data

#

# Can optionally include more than one location, causing data to be striped across

# the locations (a la RAID ) on a file level, favouring locations with most free

# space on creation. For example:

#可以可选择的包含一个以上的位置，使得数据在文件级别跨越位置，这样在创建时就有更多的*路径，如：

#path.data: /path/to/data1,/path/to/data2

# Path to temporary files:

# 临时文件位置：

#path.work: /path/to/work

# Path to log files:

#日志文件所在位置：

#path.logs: /path/to/logs

# Path to where plugins are installed:

# 插件安装位置：

#path.plugins: /path/to/plugins

#################################### Plugin ###################################

# If a plugin listed here is not installed for current node, the node will not start.

#若列表中的某一个插件未安装，则节点无法启动：

#plugin.mandatory: mapper-attachments,lang-groovy

################################### Memory ####################################

# Elasticsearch performs poorly when JVM starts swapping: you should ensure that

# it _never_ swaps.

#

# Set this property to true to lock the memory:

#JVM开始交换时，ElasticSearch表现并不好：你需要保障JVM不进行交换，可以将bootstrap.mlockall设置为true禁止交换

#bootstrap.mlockall: true

# Make sure that the ES_MIN_MEM and ES_MAX_MEM environment variables are set

# to the same value, and that the machine has enough memory to allocate

# for Elasticsearch, leaving enough memory for the operating system itself.

#请确保ES_MIN_MEM和ES_MAX_MEM的值是一样的，并且能够为ElasticSearch分配足够的内在，并为系统操作保留足够的内存

# You should also make sure that the Elasticsearch process is allowed to lock

# the memory, eg. by using `ulimit -l unlimited`.

#你应该确保Elasticsearch 进程可以锁定内存。通过使用"ulimit -l unlimited"

############################## Network And HTTP ###############################

# Elasticsearch, by default, binds itself to the 0.0.0.0 address, and listens

# on port [-] for HTTP traffic and on port [-] for node-to-node

# communication. (the range means that if the port is busy, it will automatically

# try the next port).

# 默认情况下，ElasticSearch使用0.0.0.0地址，并为http传输开启9200-9300端口，

#    为节点到节点的通信开启9300-9400端口，也可以自行设置IP地址

#    （如果节点被占用了，es将会自动尝试使用下一个端口）

# Set the bind address specifically (IPv4 or IPv6):

#

#network.bind_host: 192.168.0.1

# Set the address other nodes will use to communicate with this node. If not

# set, it is automatically derived. It must point to an actual IP address.

# publish_host设置其他节点连接此节点的地址，如果不设置的话，则自动获取，publish_host的地址必须为真实地址

#network.publish_host: 192.168.0.1

# Set both 'bind_host' and 'publish_host':

#bind_host和publish_host可以一起设置

#network.host: 192.168.0.1

# Set a custom port for the node to node communication ( by default):

#可以定制该节点与其他节点交互的端口

#transport.tcp.port: 

# Enable compression for all communication between nodes (disabled by default):

#节点间交互时，可以设置是否压缩，默认为不压缩

#transport.tcp.compress: true

# Set a custom port to listen for HTTP traffic:

#可以为Http传输监听定制端口

#http.port: 

# Set a custom allowed content length:

#设置内容的最大长度

#http.max_content_length: 100mb

# Disable HTTP completely:

#禁止HTTP

#http.enabled: false

################################### Gateway ###################################

# The gateway allows for persisting the cluster state between full cluster

# restarts. Every change to the state (such as adding an index) will be stored

# in the gateway, and when the cluster starts up for the first time,

# it will read its state from the gateway.

# 网关允许在所有集群重启后持有集群状态，集群状态的变更都会被保存下来，

#    当第一次启用集群时，可以从网关中读取到状态，

# There are several types of gateway implementations. For more information, see

# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/modules-gateway.html>.

# The default gateway type is the "local" gateway (recommended):

#默认文件类型是本地local：

#gateway.type: local

# Settings below control how and when to start the initial recovery process on

# a full cluster restart (to reuse as much local data as possible when using shared

# gateway).

# Allow recovery process after N nodes in a cluster are up:

#允许在N个节点启动后恢复过程

#gateway.recover_after_nodes: 

# Set the timeout to initiate the recovery process, once the N nodes

# from previous setting are up (accepts time value):

#设置初始化恢复过程的超时时间

#gateway.recover_after_time: 5m

# Set how many nodes are expected in this cluster. Once these N nodes

# are up (and recover_after_nodes is met), begin recovery process immediately

# (without waiting for recover_after_time to expire):

#设置该集群中可存在的节点上限

#gateway.expected_nodes: 

############################# Recovery Throttling #############################

# These settings allow to control the process of shards allocation between

# nodes during initial recovery, replica allocation, rebalancing,

# or when adding and removing nodes.

# Set the number of concurrent recoveries happening on a node:

#设置一个节点的并发数量，有两种情况，

#一种是在初始复苏过程中：

# . During the initial recovery

#

#cluster.routing.allocation.node_initial_primaries_recoveries:

#

# . During adding/removing nodes, rebalancing, etc

#另一种是在添加、删除节点及调整时：

#cluster.routing.allocation.node_concurrent_recoveries: 

# Set to throttle throughput when recovering (eg. 100mb, by default 20mb):

#设置复苏时的吞吐量，默认情况下是无限的

#indices.recovery.max_bytes_per_sec: 20mb

# Set to limit the number of open concurrent streams when

# recovering a shard from a peer:

#设置从对等节点恢复片段时打开的流的数量上限

#indices.recovery.concurrent_streams: 

################################## Discovery ##################################

# Discovery infrastructure ensures nodes can be found within a cluster

# and master node is elected. Multicast discovery is the default.

# Set to ensure a node sees N other master eligible nodes to be considered

# operational within the cluster. This should be set to a quorum/majority of

# the master-eligible nodes in the cluster.

#设置一个集群中主节点的数量，当多于三个节点时，该值可在2-4之间

#discovery.zen.minimum_master_nodes: 

# Set the time to wait for ping responses from other nodes when discovering.

# Set this option to a higher value on a slow or congested network

# to minimize discovery failures:

#设置ping其他节点时的超时时间，网络比较慢时可将该值设大

#discovery.zen.ping.timeout: 3s

# For more information, see

# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/modules-discovery-zen.html>

# Unicast discovery allows to explicitly control which nodes will be used

# to discover the cluster. It can be used when multicast is not present,

# or to restrict the cluster communication-wise.

#

# . Disable multicast discovery (enabled by default):

# 禁止当前节点发现多个集群节点，

# 默认启用发现节点机制，设为false的话表示禁用自动发现机制

#discovery.zen.ping.multicast.enabled: false

#

# . Configure an initial list of master nodes in the cluster

#    to perform discovery when new nodes (master or data) are started:

#设置新节点被启动时能够发现的主节点列表

#discovery.zen.ping.unicast.hosts: ["host1", "host2:port"]

# EC2 discovery allows to use AWS EC2 API in order to perform discovery.

#

# You have to install the cloud-aws plugin for enabling the EC2 discovery.

#

# For more information, see

# <http://elasticsearch.org/guide/en/elasticsearch/reference/current/modules-discovery-ec2.html>

#

# See <http://elasticsearch.org/tutorials/elasticsearch-on-ec2/>

# for a step-by-step tutorial.

# GCE discovery allows to use Google Compute Engine API in order to perform discovery.

#

# You have to install the cloud-gce plugin for enabling the GCE discovery.

#

# For more information, see <https://github.com/elasticsearch/elasticsearch-cloud-gce>.

# Azure discovery allows to use Azure API in order to perform discovery.

#

# You have to install the cloud-azure plugin for enabling the Azure discovery.

#

# For more information, see <https://github.com/elasticsearch/elasticsearch-cloud-azure>.

################################## Slow Log ##################################

# Shard level query and fetch threshold logging.

#index.search.slowlog.threshold.query.warn: 10s

#index.search.slowlog.threshold.query.info: 5s

#index.search.slowlog.threshold.query.debug: 2s

#index.search.slowlog.threshold.query.trace: 500ms

#index.search.slowlog.threshold.fetch.warn: 1s

#index.search.slowlog.threshold.fetch.info: 800ms

#index.search.slowlog.threshold.fetch.debug: 500ms

#index.search.slowlog.threshold.fetch.trace: 200ms

#index.indexing.slowlog.threshold.index.warn: 10s

#index.indexing.slowlog.threshold.index.info: 5s

#index.indexing.slowlog.threshold.index.debug: 2s

#index.indexing.slowlog.threshold.index.trace: 500ms

################################## GC Logging ################################

#monitor.jvm.gc.young.warn: 1000ms

#monitor.jvm.gc.young.info: 700ms

#monitor.jvm.gc.young.debug: 400ms

#monitor.jvm.gc.old.warn: 10s

#monitor.jvm.gc.old.info: 5s

#monitor.jvm.gc.old.debug: 2s

################################## Security ################################

# Uncomment if you want to enable JSONP as a valid return transport on the

# http server. With this enabled, it may pose a security risk, so disabling

# it unless you need it is recommended (it is disabled by default).

#如果你想要启用JSONP作为HTTP服务器的有效传输的话取消注释。

#启用此功能，它可能会带来风险。因此，禁用它，除非你必须需要它（默认禁用）

#http.jsonp.enable: true