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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11187) Optimize disk access for last partial chunk checksum of Finalized replica
Date Sat, 05 Aug 2017 05:42:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Wei-Chiu Chuang updated HDFS-11187:
-----------------------------------
    Status: Open  (was: Patch Available)

> Optimize disk access for last partial chunk checksum of Finalized replica
> -------------------------------------------------------------------------
>
>                 Key: HDFS-11187
>                 URL: https://issues.apache.org/jira/browse/HDFS-11187
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>         Attachments: HDFS-11187.001.patch
>
>
> The patch at HDFS-11160 ensures BlockSender reads the correct version of metafile when
there are concurrent writers.
> However, the implementation is not optimal, because it must always read the last partial
chunk checksum from disk while holding FsDatasetImpl lock for every reader. It is possible
to optimize this by keeping an up-to-date version of last partial checksum in-memory and reduce
disk access.
> I am separating the optimization into a new jira, because maintaining the state of in-memory
checksum requires a lot more work.



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