Andrew Wong updated KUDU-2179:
    Target Version/s: 1.8.0

> Have ksck not use a single snapshot for all tablets
> ---------------------------------------------------
>                 Key: KUDU-2179
>                 URL: https://issues.apache.org/jira/browse/KUDU-2179
>             Project: Kudu
>          Issue Type: Improvement
>          Components: ksck
>            Reporter: Andrew Wong
>            Priority: Major
> When ksck runs, it selects a single timestamp and does a snapshot scan at 
> this time across all tablets. If the scans run for a long time (e.g. due to 
> heavy traffic to the tservers), some scans may be attempted on data that has 
> already been GC'ed, surfacing the errors:
> {{Error: Invalid argument: Snapshot timestamp is earlier than the ancient 
> history mark. Consider increasing the value of the configuration parameter 
> --tablet_history_max_age_sec. Snapshot timestamp: P: 1507232752670708 usec, 
> L: 0 Ancient History Mark: P: 1507232752970869 usec, L: 0 Physical time 
> difference: -0.300s}}
> This could be remediated by batching these scans and selecting a new 
> timestamp for each batch.

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