[
https://issues.apache.org/jira/browse/HDFS-8966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jing Zhao updated HDFS-8966:
----------------------------
Target Version/s: HDFS-8966
> 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
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
