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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1623) High Availability Framework for HDFS NN
Date Fri, 11 Feb 2011 02:52:57 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12993315#comment-12993315

Sanjay Radia commented on HDFS-1623:

There are various steps one can take to improve the availability of the HDFS Namenode (NN)
including reducing startup time, refreshing configuration without restarting the cluster,
reducing upgrade time, and providing an manual or automatic failover of the NN, etc. This
jira focuses on failover of the NN to address the issue of NN as a single point of failure.

There are various ways to provide failure of NN. Some of these include the use of shared storage
while others do not. Some include the use of IP failover while others use a smart client side
library.  One could use Zookeeper for leader election or some other off the shelf scheme such
as Linux HA. These different solutions can share some framework components as building blocks.
The purpose of this jira is to define these framework components for building failover solution
towards improving availability.  The avatar node could use some of these framework components.
Some of the code from avatar node can be used towards building the framework components.

Sub jiras will be created to address each of the framework components.

> High Availability Framework for HDFS NN
> ---------------------------------------
>                 Key: HDFS-1623
>                 URL: https://issues.apache.org/jira/browse/HDFS-1623
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia

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