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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-5933.002.patch
Rebase on the HDFS-5922 v3 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, HDFS-5933.001.patch,
> HDFS-5933.002.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.
>
> An ACL entry is represented by a 32-bit integer in Big Endian format. The
> bits can be divided in four segments:
> [0:2) || [2:26) || [26:27) || [27:29) || [29:32)
> [0:2) -- reserved for futute uses.
> [2:26) -- the name of the entry, which is an ID that points to a string in
> the StringTableSection.
> [26:27) -- the scope of the entry (AclEntryScopeProto)
> [27:29) -- the type of the entry (AclEntryTypeProto)
> [29:32) -- the permission of the entry (FsActionProto)
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