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From "Erik Krogen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11021) Add FSNamesystemLock metrics for BlockManager operations
Date Mon, 17 Oct 2016 17:54:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15582917#comment-15582917
] 

Erik Krogen commented on HDFS-11021:
------------------------------------

Currently the {{BlockManager}} only uses the {{Namesystem}} interface, which inherits all
of its locking methods from the {{RwLock}} interface. {{Namesystem}} is the only implementer
of that interface. For the {{BlockManager}} to emit lock hold time metrics, it needs access
to the {{read/writeUnlock(String operationName)}} methods on {{FSNamesystem}}. We have two
options: adding these methods to the {{Namesystem}} interface, or to the {{RwLock}} interface.
It may make sense to group all of the locking-related methods together in {{RwLock}}, but
this may be polluting that interface. Any thoughts on this?

> Add FSNamesystemLock metrics for BlockManager operations
> --------------------------------------------------------
>
>                 Key: HDFS-11021
>                 URL: https://issues.apache.org/jira/browse/HDFS-11021
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Erik Krogen
>            Assignee: Erik Krogen
>
> Right now the operations which the {{BlockManager}} issues to the {{Namesystem}} will
not emit metrics about which operation caused the {{FSNamesystemLock}} to be held; they are
all grouped under "OTHER". We should fix this since the {{BlockManager}} creates many acquisitions
of both the read and write locks. 



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