学习hadoop过程中的思考
最近在看hadoop权威指南，刚刚接触hadoop，想寻找一些方法，于是按照hadoop官网上的邮件地址问了一个问题，没想到很快就答复了，是这样的：
Hi Jie,
Well come to Hadoop. :-)
Your thought is very good. And there are multiple issues (HDFS-1623, HDFS-2124, HDFS-2064) exists in community regarding to high availability for NameNode. Just have a look on them.
Regards,
Uma
----- Original Message -----
From: jie_zhou <[email protected]>
Date: Wednesday, August 31, 2011 12:44 pm
Subject: help me answer some questions about HDFS
> Dear:
>
> Nice to me you!
>
>
>
> I am a beginner of hadoop,and when I study about the utility of
> hadoop.Ifind that there is only one namenode which is key to the whole
> system. Hdfs provides a auxiliary namenode which is helpful when the
> namenode crashes,butthis process maybe waste a lot of time .What I am
> trying to say is that can we design the hdfs to the multi-master mode
> with no single points of failure or such as dual-system hot backup.
> This is just my guession when studyingthe hadoop.
> Thanks for your early reply.
> Best Regards,
>
> jie
>
很明显，邮件上让我去看HDFS-1623, HDFS-2124, HDFS-2064这三个issues，这个通过查找，是在apache的jira上，于是赶快注册，登陆，找到了https://issues.apache.org/jira/browse/HDFS-1623
发现里面东西多多啊，我提出的问题已经有好多人在讨论过了