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Posted to hdfs-issues@hadoop.apache.org by "Yiqun Lin (JIRA)" <ji...@apache.org> on 2017/03/02 09:54:45 UTC
[jira] [Updated] (HDFS-11464) Improve the selection in choosing
storage for blocks
[ https://issues.apache.org/jira/browse/HDFS-11464?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yiqun Lin updated HDFS-11464:
-----------------------------
Status: Patch Available (was: Open)
> Improve the selection in choosing storage for blocks
> ----------------------------------------------------
>
> Key: HDFS-11464
> URL: https://issues.apache.org/jira/browse/HDFS-11464
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Yiqun Lin
> Assignee: Yiqun Lin
> Attachments: HDFS-11464.001.patch
>
>
> Currently the logic in choosing storage for blocks is not a good way. It always uses the first valid storage of a given StorageType ({{see DataNodeDescriptor#chooseStorage4Block}}). This should not be a good selection. That means blcoks will always be written to the same volume (first volume) and other valid volumes have no choices. This problem is brought up by this comment ( https://issues.apache.org/jira/browse/HDFS-9807?focusedCommentId=15878382&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15878382 )
> There is one solution from me:
> * First, based on existing storages in one node, extract all the valid storages into a collection.
> * Then, disrupt the order of these vaild storages, get a new collection.
> * Finally, get the first storage from the new storages collection.
> These steps will be executed in {{DataNodeDescriptor#chooseStorage4Block}} and replace current logic. I think this improvement can be done as a subtask under HDFS-11419. Any further comments are welcomed.
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