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https://issues.apache.org/jira/browse/HDFS-11464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16406971#comment-16406971
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genericqa commented on HDFS-11464:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 5s{color}
| {color:red} HDFS-11464 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-11464 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12867091/HDFS-11464.005.patch |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/23572/console |
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This message was automatically generated.
> 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.
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