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Posted to hdfs-dev@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2018/01/02 20:22:00 UTC

[jira] [Created] (HDFS-12978) Fine-grained locking while consuming journal stream.

Konstantin Shvachko created HDFS-12978:
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             Summary: 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


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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