[jira] [Updated] (HDFS-15567) [SBN Read] HDFS should expose msync() API to allow downstream applications call it explicetly.

["Konstantin Shvachko (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-15567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Shvachko updated HDFS-15567:
---------------------------------------
    Attachment: HDFS-15567.001.patch

> [SBN Read] HDFS should expose msync() API to allow downstream applications call it explicetly.
> ----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-15567
>                 URL: https://issues.apache.org/jira/browse/HDFS-15567
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, hdfs-client
>            Reporter: Konstantin Shvachko
>            Priority: Major
>         Attachments: HDFS-15567.001.patch
>
>
> Consistent reads from Standby introduced {{msync()}} API HDFS-13688, which updates client's state ID with current state of the Active NameNode to guarantee consistency of subsequent calls to an ObserverNode. Currently this API is exposed via {{DFSClient}} only, which makes it hard for applications to access {{msync()}}. One way is to use something like this:
> {code}
> if(fs instanceof DistributedFileSystem) {
>   ((DistributedFileSystem)fs).getClient().msync();
> }
> {code}
> This should be exposed both for {{FileSystem}} and {{FileContext}}.



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