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https://issues.apache.org/jira/browse/HDFS-5933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haohui Mai updated HDFS-5933:
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Attachment: HDFS-5933.000.patch
> 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
>
>
> 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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