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https://issues.apache.org/jira/browse/HDFS-12172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16111958#comment-16111958
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Xiao Chen commented on HDFS-12172:
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Thanks for the work here [~daryn]! Looks pretty good overall.
A few nits below:
- Could you add some javadocs to the
{{EncryptionZoneManager.java#getEncryptionZoneInt(INodesInPath iip, int
offset)}} method? Without looking into the method body, I wasn't sure how the
offset should be passed in. Good to also add some assertions that {{offset < 0
&& offset > iip.length()}} too.
- {{FSDirEncryptionZoneOp#getFileEncryptionInfo(FSDirectory dir,
EncryptionZoneInt zone, EncryptionKeyInfo ezInfo)}} can get rid of the first
{{dir}} param now.
- javadoc on {{FSDirEncryptionZoneOp#getEncryptionKeyInfo}} needs updating
+1 pending the above.
> Reduce EZ lookup overhead
> -------------------------
>
> Key: HDFS-12172
> URL: https://issues.apache.org/jira/browse/HDFS-12172
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.7.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-12172.patch
>
>
> A number of inefficiencies exist in EZ lookups. These are amplified by
> frequent operations like list status. Once one encryption zone exists, all
> operations take the performance penalty.
> Ex. Operations should not perform redundant lookups. EZ path reconstruction
> should be lazy since it's not required in the common case. Renames do not
> need to reallocate new IIPs to check parent dirs for EZ.
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