[jira] [Updated] (HDFS-15119) Allow expiration of cached locations in DFSInputStream

["Ahmed Hussein (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-15119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ahmed Hussein updated HDFS-15119:
---------------------------------
    Attachment: HDFS-15119.001.patch
        Status: Patch Available  (was: Open)

> Allow expiration of cached locations in DFSInputStream
> ------------------------------------------------------
>
>                 Key: HDFS-15119
>                 URL: https://issues.apache.org/jira/browse/HDFS-15119
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: dfsclient
>            Reporter: Ahmed Hussein
>            Assignee: Ahmed Hussein
>            Priority: Minor
>         Attachments: HDFS-15119.001.patch
>
>
> Staleness and other transient conditions can affect reads for a long time since the block locations may not be re-fetched. It makes sense to make cached locations to expire.
> For example, we may not take advantage of local-reads since the nodes are blacklisted and have not been updated.



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