[
https://issues.apache.org/jira/browse/HDFS-11464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17802512#comment-17802512
]
Shilun Fan commented on HDFS-11464:
-----------------------------------
Bulk update: moved all 3.4.0 non-blocker issues, please move back if it is a
blocker. Retarget 3.5.0.
> 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
> Priority: Major
> Attachments: HDFS-11464.001.patch, HDFS-11464.002.patch,
> HDFS-11464.003.patch, HDFS-11464.004.patch, HDFS-11464.005.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.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
