hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6677) Archival Storage: Change INodeFile and FSImage to support storage policy
Date Mon, 14 Jul 2014 17:30:06 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo Nicholas Sze updated HDFS-6677:
--------------------------------------

    Attachment: h6677_20140714.patch

h6677_20140714.patch: 1st patch. 

> Archival Storage: Change INodeFile and FSImage to support storage policy
> ------------------------------------------------------------------------
>
>                 Key: HDFS-6677
>                 URL: https://issues.apache.org/jira/browse/HDFS-6677
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h6677_20140714.patch
>
>
> Policy ID will be stored in INodeFile header with 4 bits which can support 16 different
storage policies.  The number of bits for replication will be reduced from 16 bits to 12 bits
which is still able to support up to 4095 replicas.  The number of bits for block size remains
48 bits.  The memory usage of INodeFile remains unchanged.
> The storage policy IDs assigned to Hot, Warm and Cold policies are respectively 12, 8
and 4.  These numbers are chosen with gaps so that future policies can be added in-between.
> We should make a corresponding change in FSImage.



--
This message was sent by Atlassian JIRA
(v6.2#6252)

Mime
View raw message