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https://issues.apache.org/jira/browse/HDFS-12195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16101737#comment-16101737
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Weiwei Yang commented on HDFS-12195:
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Hi [~yuanbo]
I know this is still working in progress, but some early comments. We are using
ksm.db to store keys under deletion so that we can do "atomic" update, by
leveraging db batch operation. Please see more in {{MetadataStore#writeBatch}},
please use this API to do batch update of moving a key in ksm.db.
Thanks
> Ozone: DeleteKey-1: KSM replies delete key request asynchronously
> -----------------------------------------------------------------
>
> Key: HDFS-12195
> URL: https://issues.apache.org/jira/browse/HDFS-12195
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ozone
> Affects Versions: HDFS-7240
> Reporter: Weiwei Yang
> Assignee: Yuanbo Liu
> Attachments: client-ksm.png, HDFS-12195-HDFS-7240.001.patch
>
>
> We will implement delete key in ozone in multiple child tasks, this is 1 of
> the child task to implement client to scm communication. We need to do it in
> async manner, once key state is changed in ksm metadata, ksm is ready to
> reply client with a successful message. Actual deletes on other layers will
> happen some time later.
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