Hi Sonam,
The easiest way to see whether local state has been used for recovery is
the recovery time. Apart from that you can also look for "Found registered
local state for checkpoint {} in subtask ({} - {} - {}" in the logs which
is logged on debug. This indicates that the local state is available.
However, it does not say whether it is actually used. E.g. when doing a
rescaling operation we change the assignment of key group ranges which
prevents local state from being used. However in case of a recovery the
above-mentioned log message should indicate that we use local state
recovery.
Cheers,
Till
On Tue, Apr 6, 2021 at 11:31 AM Tzu-Li (Gordon) Tai <tzuli...@apache.org>
wrote:
> Hi Sonam,
>
> Pulling in Till (cc'ed), I believe he would likely be able to help you
> here.
>
> Cheers,
> Gordon
>
> On Fri, Apr 2, 2021 at 8:18 AM Sonam Mandal <soman...@linkedin.com> wrote:
>
>> Hello,
>>
>> We are experimenting with task local recovery and I wanted to know
>> whether there is a way to validate that some tasks of the job recovered
>> from the local state rather than the remote state.
>>
>> We've currently set this up to have 2 Task Managers with 2 slots each,
>> and we run a job with parallelism 4. To simulate failure, we kill one of
>> the Task Manager pods (we run on Kubernetes). I want to see if the local
>> state of the other Task Manager was used or not. I do understand that the
>> state for the killed Task Manager will need to be fetched from the
>> checkpoint.
>>
>> Also, do you have any suggestions on how to test such failure scenarios
>> in a better way?
>>
>> Thanks,
>> Sonam
>>
>
