[jira] [Updated] (HDFS-12696) BlockPoolManager#startAll is called twice during DataNode startup

["Nandakumar (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-12696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nandakumar updated HDFS-12696:
------------------------------
    Status: Patch Available  (was: Open)

> BlockPoolManager#startAll is called twice during DataNode startup
> -----------------------------------------------------------------
>
>                 Key: HDFS-12696
>                 URL: https://issues.apache.org/jira/browse/HDFS-12696
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Nandakumar
>            Assignee: Nandakumar
>            Priority: Minor
>         Attachments: HDFS-12696.000.patch
>
>
> As part of Datanode startup, {{BlockPoolManager#startAll}} which starts all {{BPServiceActor}} threads is called twice.
> First in {{Datanode}} constructor, {{Datanode#startDataNode}} is called which does {{BlockPoolManager#refreshNamenodes}} inside which we do {{startAll}}
> And as part of {{Datanode#runDatanodeDaemon}} we again call {{BlockPoolManager#startAll}}.
> Since {{BPServiceActor}} checks if {{bpThread}} is already running, before starting them again, the second call is ignored.



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