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From "Mariano Valles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (S4-137) Add HDFS StateStorage for more reliable checkpoint saving
Date Wed, 04 Sep 2013 09:44:52 GMT

    [ https://issues.apache.org/jira/browse/S4-137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13757604#comment-13757604
] 

Mariano Valles commented on S4-137:
-----------------------------------

I worked on something related to this back on S4 0.4.
At that moment one of the alternatives was to use Redis as a checkpoint storage mechanism.
https://github.com/s4/s4/blob/master/s4-core/src/main/java/org/apache/s4/ft/RedisStateStorage.java

I worked on creating an append-only file similar to the DefaultFileSystemStateStorage but
using one file instead of many. But this was more a proof of concept implementation.

While doing this we also thought on using a Distributed File System such as NFS or similar
and just using the DefaultFileSystemStateStorage on this path. This would improve the availability
of the checkpoints.
                
> Add HDFS StateStorage for more reliable checkpoint saving
> ---------------------------------------------------------
>
>                 Key: S4-137
>                 URL: https://issues.apache.org/jira/browse/S4-137
>             Project: Apache S4
>          Issue Type: New Feature
>    Affects Versions: 0.6
>            Reporter: Kurtt.Lin
>            Priority: Minor
>              Labels: checkpoint
>             Fix For: 0.7
>
>   Original Estimate: 120h
>  Remaining Estimate: 120h
>
> Currently DefaultFileSystemStateStorage is the only implementation for StateStorage.
Should have a storage like HDFS to improve the reliability of the checkpoints' states. Some
apps would benefit from this.

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