Tsuyoshi Ozawa updated YARN-3841:
    Attachment: YARN-3841.001.patch

Attaching a first patch to convert the implementation into FileSystem based one.

[~sjlee0] [~zjshen] could you take a look?

> [Storage implementation] Create HDFS backing storage implementation for ATS 
> writes
> ----------------------------------------------------------------------------------
>                 Key: YARN-3841
>                 URL: https://issues.apache.org/jira/browse/YARN-3841
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: timelineserver
>            Reporter: Tsuyoshi Ozawa
>            Assignee: Tsuyoshi Ozawa
>         Attachments: YARN-3841.001.patch
> HDFS backing storage is useful for following scenarios.
> 1. For Hadoop clusters which don't run HBase.
> 2. For fallback from HBase when HBase cluster is temporary unavailable. 
> Quoting ATS design document of YARN-2928:
> {quote}
> In the case the HBase
> storage is not available, the plugin should buffer the writes temporarily 
> (e.g. HDFS), and flush
> them once the storage comes back online. Reading and writing to hdfs as the 
> the backup storage
> could potentially use the HDFS writer plugin unless the complexity of 
> generalizing the HDFS
> writer plugin for this purpose exceeds the benefits of reusing it here.
> {quote}

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