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From "Stefan Richter (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-6505) Proactively cleanup local FS for RocksDBKeyedStateBackend on startup
Date Thu, 11 May 2017 09:49:04 GMT

     [ https://issues.apache.org/jira/browse/FLINK-6505?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Stefan Richter updated FLINK-6505:
    Issue Type: Sub-task  (was: Bug)
        Parent: FLINK-6537

> Proactively cleanup local FS for RocksDBKeyedStateBackend on startup
> --------------------------------------------------------------------
>                 Key: FLINK-6505
>                 URL: https://issues.apache.org/jira/browse/FLINK-6505
>             Project: Flink
>          Issue Type: Sub-task
>          Components: State Backends, Checkpointing
>    Affects Versions: 1.3.0
>            Reporter: Stefan Richter
> In {{RocksDBKeyedStateBackend}}, the {{instanceBasePath}} is cleared on {{dispose()}}.
I think it might make sense to also clear this directory when the backend is created, in case
something crashed and the backend never reached {{dispose()}}. At least for previous runs
of the same job, we can know what to delete on restart. 
> In general, it is very important for this backend to clean up the local FS, because the
local quota might be very limited compared to the DFS. And a node that runs out of local disk
space can bring down the whole job, with no way to recover (it might always get rescheduled
to that node).

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