Java Clients for Elasticsearch
设置elasticsearch的java heap大小：
The default installation of Elasticsearch is configured with a 1 GB heap.
There are two ways to change the heap size in Elasticsearch.
1、The easiest is to set an environment variable called ES_HEAP_SIZE.
When the server process starts, it will read this environment variable and set the heap accordingly. As an example, you can set it via the command line as follows:
export ES_HEAP_SIZE=10g
2、you can pass in the heap size via a command-line argument when starting the process, if that is easier for your setup:
./elasticsearch -d -DES_JAVA_OPTS="-Xms1g -Xmx10g"
-Xmx(maximun allowed memory for the process)
-Xms(minimun allowed memory for the process)
还有另一种方式，可以直接修改es的启动脚本，修改默认的JAVA_OPTS设置
$ vi bin/elasticsearch.in.sh
if [ "x$ES_MIN_MEM" = "x" ]; then
ES_MIN_MEM=256m #-Xms
fi
if [ "x$ES_MAX_MEM" = "x" ]; then
ES_MAX_MEM=1g # -Xmx
fi
if [ "x$ES_HEAP_SIZE" != "x" ]; then
ES_MIN_MEM=$ES_HEAP_SIZE
ES_MAX_MEM=$ES_HEAP_SIZE
fi
利用java客户端连接远程elasticsearch服务器时，
实例化client对象的方式如下：
Client client = null;
try {
client = TransportClient.builder().build()
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("master001"), 9300));
} catch(UnknownHostException e){
System.out.println("unkown host: " +e.getMessage());
} finally {
return client;
}
抛出异常：NoNodeAvailableException].
解决此异常需要设置cluster.name属性，方式如下：
Client client = null;
try {
client = TransportClient.builder().settings(Settings.builder().put("cluster.name", "cobub-es-testing")).build()
.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("master001"), 9300));
} catch(UnknownHostException e){
System.out.println("unkown host: " +e.getMessage());
} finally {
return client;
}
修改后，连接正常。
参考：
Government Blog: Java Clients for Elasticsearch；
Heap: Sizing and Swapping；
Spring Data Es in Github: spring-projects/spring-data-elasticsearch；
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