MAPR-文件读写过程 [英] MAPR -File Read and Write Process

问题描述

我找不到特定的链接，该链接向我解释了元数据如何在MAPR(文件元数据)中分布.当我查看cloudera/hortonworks/apache hadoop时，我知道元数据存储在namenode的内存中，然后将其提取以找到保存这些块的节点.我想了解它在MAPR中是如何工作的.

I am not able to find a specific link that explains to me how the meta data is distributed in MAPR(File meta data). When I look at cloudera / hortonworks /apache hadoop I know the meta data is stored in namenode's memory which is then fetched to locate the nodes that holds the blocks. How does it work in MAPR is what I am trying to understand.

任何帮助将不胜感激.

推荐答案

MapR本地实现了MapR-FS的网络文件系统(NFS)接口，因此任何文件系统都可以读写文件系统，无论是对文件系统的读写.本地文件系统，网络附加存储或存储区域网络可以在MapR-FS之间读写数据.

MapR natively implemented a Network File System (NFS) interface to MapR-FS so that any reads and writes from and to a file system, whether it be to a local file system, Network Attached Storage, or a Storage Area Network, can read and write data from and to MapR-FS.

这也是MapR在安装过程中要求原始磁盘的原因，以便将磁盘重新格式化为MapR-FS.

This is also the reason MapR asks for a raw disk during the installation so that, it reformats the disk as MapR-FS.

只是碰到了这个线程:

http://answers.mapr.com/questions/108/how-is-metadata-stored.html

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