Haohui Mai created HDFS-5933:
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Summary: 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
Reporter: Haohui Mai
Assignee: Haohui Mai
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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