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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2191) Move datanodeMap from FSNamesystem to DatanodeManager
Date Tue, 26 Jul 2011 06:31:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13070970#comment-13070970

Suresh Srinivas commented on HDFS-2191:

# Is this correct? {{10000 * heartbeatIntervalSeconds}} Why 10000? Should you be multiplying
it by 1000 when getting it from conf and not 10000 *?
# blockManager.getDatanodeManager().getDatanode() - we could add a method blockManager.getDataNode()
- I prefer this instead of exposing DatanodeManager to FSNamesystem.
# Earlier getDatanode() used to lock using datanodeMap, do we need that with your patch? How
is it synchronized now? Also datanodeMap access may not be synchronized correctly - for example
datanodeDump synchronizes it but other instances such as DatanodeManager#getDatanode() does
# In a future patch FSNamesystem#heartbeats and its synchronization should move to blockmanager
# Please change javadoc of getDatanode() as throws UnregisteredNodeException.
# I am sure you have already planned for removing FSNamesystem#blockInvalidateLimit in future
# How is DatanodeManager#getDatanodeCyclicIteration() synchronized? It cannot be synchronized
using FSNamesystem.writeLock() as done currently?

> Move datanodeMap from FSNamesystem to DatanodeManager
> -----------------------------------------------------
>                 Key: HDFS-2191
>                 URL: https://issues.apache.org/jira/browse/HDFS-2191
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h2191_20110723.patch, h2191_20110723b.patch

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