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From "Jeff Hammerbacher (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1499) mv the namenode NameSpace and BlocksMap to hbase to save the namenode memory
Date Mon, 15 Nov 2010 08:12:15 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932012#action_12932012
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Jeff Hammerbacher commented on HDFS-1499:
-----------------------------------------

See https://issues.apache.org/jira/browse/HDFS-1051 for the umbrella JIRA for scaling the
NN. There, you'll find a comment that points to http://code.google.com/p/hdfs-dnn, which implements
the strategy you suggest.

> mv the namenode NameSpace and BlocksMap to hbase to save the namenode memory
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-1499
>                 URL: https://issues.apache.org/jira/browse/HDFS-1499
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: dl.brain.ln
>
> The NameNode stores all its metadata in the main memory of the machine on which it is
deployed. With the file-count and block number growing, namenode machine can't hold anymore
files and blocks in its memory and thus restrict the HDFS cluster growth. So many people are
talking and thinking abont this problem. Google's next version of GFS use bigtable to store
the metadata of the DFS and that seem works. What if we use hbase as the same?
> In the namenode structure, the namespace of the filesystem and the map of block ->
datanodes, datanode->blocks which keeped in memory are consume most of the namenode's heap,
what if we store those data structure in hbase to decrease the namenode's memory?

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