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https://issues.apache.org/jira/browse/HDFS-1518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964628#action_12964628
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Jingguo Yao commented on HDFS-1518:
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"4)" should be inverted of "3)" instead of "2)". "3)" is "block -->
machinelist". "4)" is "machine --> blocklist".
* 1) valid fsname --> blocklist (kept on disk, logged)
* 2) Set of all valid blocks (inverted #1)
* 3) block --> machinelist (kept in memory, rebuilt dynamically from reports)
* 4) machine --> blocklist (inverted #2)
* 5) LRU cache of updated-heartbeat machines
> Wrong description in FSNamesystem's javadoc
> -------------------------------------------
>
> Key: HDFS-1518
> URL: https://issues.apache.org/jira/browse/HDFS-1518
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.21.0
> Reporter: Jingguo Yao
> Assignee: Jingguo Yao
> Priority: Minor
> Attachments: HDFS-1518.patch
>
> Original Estimate: 0.08h
> Remaining Estimate: 0.08h
>
> "4) machine --> blocklist (inverted #2)" should be "4) machine -->
> blocklist (inverted #3)"
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