命名空间存储配置（Namespace Storage Configuration）

aerospike决定在哪里存储数据的存储引擎配置是基于命名空间的，这些引擎确定数据将被保存到磁盘，驻留在内存或者基于磁盘和内存的混合存储。这些决定将会影响持久性，成本和集群的性能。

Support for Multi-Bin（支持多个bin）

Supports full Aerospike data Model (支持所有的Aerospike数据模型)

Survive a Power Outage（停电时保持数据）

Fast Restarts（快速重启）

Support for XDR（支持跨数据中心复制）

Index in Memory（在内存中索引）

存储引擎配置方法

下面的方法需要修改Aerospike在/etc/aerospike/aerospike.conf的服务器的配置文件。

开始,在您喜欢的编辑器中打开配置文件并做相应的更改。

SSD存储引擎的方法

namespace <namespace-name> {
    memory-size <SIZE>G         # Maximum memory allocation for primary# and secondary indexes.（最大内存分配给主索引和二级索引）
    storage-engine device {     # Configure the storage-engine to use persistence（配置存储引擎使用的持久性）
        device /dev/<device>    # raw device. Maximum size is 2 TiB（原始设备，最大的大小为2TB）# device /dev/<device> # (optional) another raw device.可选，其它设备
        write-block-size 128K   # adjust block size to make it efficient for SSDs.（调整block大小使SSD使用更高效）
    }
}

磁盘存储和内存存储的方法

namespace <namespace-name> {
    memory-size <SIZE>G             # Maximum memory allocation for data and# primary and secondary indexes.
（最大内存分配给主索引和二级索引）

    storage-engine device {         # Configure the storage-engine to use# persistence. Maximum size is 2 TiB（配置存储引擎使用的持久性。最大尺寸是2 TiB）    file /opt/aerospike/<filename>  # Location of data file on server.（数据文件在服务器中的位置）# file /opt/aerospike/<another> # (optional) Location of data file on server.    filesize <SIZE>G                # Max size of each file in GiB.    data-in-memory true# Indicates that all data should also be# in memory.（表明所有数据也应该在内存中）    }}

磁盘存储引擎和数据索引引擎的方法

namespace <namespace-name> {
    memory-size <N>G                # Maximum memory allocation for data and# primary and secondary indexes.
    single-bin true# Required true by data-in-index.
    data-in-index true# Enables in index integer store.
    storage-engine device {         # Configure the storage-engine to use# persistence.
    file /opt/aerospike/<filename>  # Location of data file on server.# file /opt/aerospike/<another> # (optimal) Location of data file on server.# device /dev/<device> # Optional alternative to using files.

    filesize <SIZE>G               # Max size of each file in GiB. Maximum size is 2TiB
    data-in-memory true# Required true by data-in-index.
    }
}

数据在内存中没有持久化的方法

namespace <namespace-name> {
    memory-size <SIZE>G   # Maximum memory allocation for data and primary and# secondary indexes.
    storage-engine memory # Configure the storage-engine to not use persistence.（配置存储引擎为不使用持久化）
}

命名空间数据保留策略

namespace <namespace-name> {
    default-ttl <VALUE>             # How long (in seconds) to keep data after# it is written
    high-water-disk-pct <PERCENT>   # How full may the disk become before the# server begins eviction (expiring records# early)
    high-water-memory-pct <PERCENT> # How full may the memory become before the# server begins eviction (expiring records# early)
    stop-writes-pct <PERCENT>       # How full may the memory become before# we disallow new writes
    ...
}

set的数据保持

namespace <namespace-name> {
    ...
    set <set-name> {
        set-evict-hwm-count <COUNT>   # How many records may reside in this set# before the server begins evicting# records from this setset-stop-writes-count <COUNT> # How many records may be in this set# before the server begins rejecting# writes to this set
    }
}

Intracluster Replication

namespace <namespace-name> {
    ...
    replication-factor 2 ...
}

服务器要求

Dell PowerEdge 12G R720 :

2 *  CPU Xeon E5-2650 V2 ；

24 * 内存为：ECC 8G (单条)：

1 * SSD 商用240G

7 * 硬盘为: 3.5 SAS 15K 600G, 硬盘做RAID5;

RAID卡为：PERC H710P ; 

Intel四端口千兆网卡 ;

iDRAC6远程管理卡；

电源： 双电 750W；

操作系统版本：centos 6.7 liunx内核3.1以上

single-bin

设置为true时将不允许有多个bin的记录

data-in-index

优化单个bin的情况，将只允许整数存储在索引空间

cluster {

    mode static #static：node-id必须是静态分配，dynamic：node-id基于本地ip地址动态选择，none：不要使用机架感应

    self-node-id  101 #识别单个节点，在同一个组内必须是唯一的

    #self-node-id  301

    self-group-id 201 #确定节点的集合，同一个组里面的节点将没有副本

}

集群背景下需要paxos-protocol v4。

logging {

  # Log file must be an absolute path.

  file /data/server/aerospike-server/bin/var/log/aerospike.log {

    context any info

  }

}

logging {
 file /var/log/aerospike/aerospike.log { context any info } file /var/log/aerospike/aerospike_debug.log { context any debug }
}

mod-lua {

  system-path /data/server/aerospike-server/bin/share/udf/lua #系统默认函数

  user-path /data/server/aerospike-server/bin/var/udf/lua #用户自定义函数

}

namespace test {

  replication-factor 2

  #memory-size 8G

  #default-ttl 30d # 30 days, use 0 to never expire/evict.

  #storage-engine memory

  memory-size 8G

  storage-engine device {

  file /opt/aerospike/data.bat

  filesize 20G

  data-in-memory true # 永远保持一份所有数据在内存中。默认为false

  }

}