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https://issues.apache.org/jira/browse/HDFS-6315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13987703#comment-13987703
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Daryn Sharp commented on HDFS-6315:
-----------------------------------
I haven't throughly examined the patch. I think moving the edit calls up to
FSN makes sense. I'm a bit uneasy about leaking the fsd locking up into the
fsn. That should be an internal implementation detail of the fsd. I see that
snapshots are locking it but that's due to reuse/abuse of the lock to protect
the snapshot manager. I don't think the pattern should be replicated to all
operations.
> Decouple recording edit logs from FSDirectory
> ---------------------------------------------
>
> Key: HDFS-6315
> URL: https://issues.apache.org/jira/browse/HDFS-6315
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Haohui Mai
> Assignee: Haohui Mai
> Attachments: HDFS-6315.000.patch, HDFS-6315.001.patch
>
>
> Currently both FSNamesystem and FSDirectory record edit logs. This design
> requires both FSNamesystem and FSDirectory to be tightly coupled together to
> implement a durable namespace.
> This jira proposes to separate the responsibility of implementing the
> namespace and providing durability with edit logs. Specifically, FSDirectory
> implements the namespace (which should have no edit log operations), and
> FSNamesystem implement durability by recording the edit logs.
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