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From "Fenghua Hu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10804) Use finer-granularity lock for ReplicaMap
Date Mon, 29 Aug 2016 08:01:21 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Fenghua Hu updated HDFS-10804:
------------------------------
    Attachment:     (was: HDFS-10804-002.patch)

> Use finer-granularity lock for ReplicaMap
> -----------------------------------------
>
>                 Key: HDFS-10804
>                 URL: https://issues.apache.org/jira/browse/HDFS-10804
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>    Affects Versions: 3.0.0-beta1
>            Reporter: Fenghua Hu
>            Assignee: Fenghua Hu
>            Priority: Minor
>             Fix For: 3.0.0-beta1
>
>         Attachments: HDFS-10804-001.patch
>
>
> In currently implementation, ReplicaMap takes an external object as lock for synchronization.
> In function FsDatasetImpl#FsDatasetImpl(), the object is for synchronization is "this",
i.e. FsDatasetImpl: 
> volumeMap = new ReplicaMap(this);
> and in private FsDatasetImpl#addVolume(), "this" object is used for synchronization as
well.
> ReplicaMap tempVolumeMap = new ReplicaMap(this);
> I am not sure if we really need so big object FsDatasetImpl  for ReplicaMap's synchronization.
If it's not necessary, this could reduce lock contention on FsDatasetImpl object and improve
performance. 
> Could you please give me some suggestions? Thanks a lot!
> Fenghua



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