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https://issues.apache.org/jira/browse/HDFS-12978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Shvachko updated HDFS-12978:
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Attachment: HDFS-12978.001.patch
> Fine-grained locking while consuming journal stream.
> ----------------------------------------------------
>
> Key: HDFS-12978
> URL: https://issues.apache.org/jira/browse/HDFS-12978
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Priority: Major
> Attachments: HDFS-12978.001.patch
>
>
> In current implementation SBN consumes the entire segment of transactions
> under a single namesystem lock, which does not allow reads over a long period
> of time until the segment is processed. We should break the lock into fine
> grained chunks. In extreme case each transaction should release the lock once
> it is applied.
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