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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5933) Optimize the FSImage layout for ACLs
Date Wed, 12 Feb 2014 00:48:19 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Chris Nauroth updated HDFS-5933:

    Hadoop Flags: Reviewed

+1 for this patch, pending commit of HDFS-5923 first.

> Optimize the FSImage layout for ACLs
> ------------------------------------
>                 Key: HDFS-5933
>                 URL: https://issues.apache.org/jira/browse/HDFS-5933
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client, namenode, security
>    Affects Versions: HDFS ACLs (HDFS-4685)
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>         Attachments: HDFS-5933.000.patch, HDFS-5933.001.patch
> The current serialization of the ACLs is suboptimal. ACL entries should be serialized
using the same scheme that the PB-based FSImage serializes permissions.
> The entry is represented by an 64-bit bit-vector, which is
> {code}
> [reserved[0:21)][name[21:45)][type[45:47)][scope[47:48)][permissions[48:64)]
> {code}
> {{name}} is a 24-bit ID that points to a string in {{StringTable}}. {{type}}, {{scope}},
{{permissions}} are the corresponding fields in an AclEntry. Bits in {{reserved}} are reserved
for future uses.

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