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From "Chen Qin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-4266) Remote Database Statebackend
Date Sat, 06 Aug 2016 04:36:20 GMT

     [ https://issues.apache.org/jira/browse/FLINK-4266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chen Qin updated FLINK-4266:
----------------------------
    Summary: Remote Database Statebackend  (was: Remote Storage Statebackend)

> Remote Database Statebackend
> ----------------------------
>
>                 Key: FLINK-4266
>                 URL: https://issues.apache.org/jira/browse/FLINK-4266
>             Project: Flink
>          Issue Type: New Feature
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.0.3, 1.2.0
>            Reporter: Chen Qin
>            Priority: Minor
>
> Current FileSystem statebackend limits whole state size to disk space. Dealing with scale
out checkpoint states beyond local disk space such as long running task that hold window content
for long period of time. Pipelines needs to split out states to durable remote storage even
replicated to different data centers.
> We draft a design that leverage checkpoint id as mono incremental logic timestamp and
perform range query to get evicited state k/v. we also introduce checkpoint time commit and
eviction threshold that reduce "hot states" hitting remote db per every update between adjacent
checkpoints by tracking update logs and merge them, do batch updates only when checkpoint;
lastly, we are looking for eviction policy that can identify "hot keys" in k/v state and lazy
load those "cold keys" from remote storage(e.g Cassandra).
> For now, we don't have good story regarding to data retirement. We might have to keep
forever until manually run command and clean per job related state data. Some of features
might related to incremental checkpointing feature, we hope to align with effort there also.
> Welcome comments, I will try to put a draft design doc after gathering some feedback.



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