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From "He Xiaoqiao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8966) Separate the lock used in namespace and block management layer
Date Fri, 23 Feb 2018 03:25:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373861#comment-16373861
] 

He Xiaoqiao commented on HDFS-8966:
-----------------------------------

[~wheat9],[~jingzhao] is this issue still ongoing?

> Separate the lock used in namespace and block management layer
> --------------------------------------------------------------
>
>                 Key: HDFS-8966
>                 URL: https://issues.apache.org/jira/browse/HDFS-8966
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Haohui Mai
>            Assignee: Haohui Mai
>            Priority: Major
>
> Currently the namespace and the block management layer share one giant lock. One consequence
that we have seen more and more often is that the namespace hangs due to excessive activities
from the block management layer. For example, the NN might take a couple hundred milliseconds
to handle a large block report. Because the NN holds the write lock during processing the
block report, all namespace requests are paused. In production we have seen these lock contentions
cause long latencies and instabilities in the cluster.
> This umbrella jira proposes to separate the lock used by namespace and the block management
layer.



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