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

["Nanda kumar (JIRA)" <ji...@apache.org>]

Nanda kumar created HDFS-12696:
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             Summary: 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: Bug
          Components: datanode
            Reporter: Nanda kumar
            Assignee: Nanda kumar
            Priority: Minor


As part of Datanode startup, {{BlockPoolManager#startAll}} which starts all the {{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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