Do you refer to restoring from a checkpoint as serialize/deserialize
cycles? There are no calls to setup/teardown and/or activate/deactivate
during checkpointing/serialization. In case of restoring from a
checkpoint (deserialization) setup() is a part of a redeployment
request, AFAIK. The best answer to question 3 is it depends. In most
cases using setup() to resolve all transient field is as good as doing
that in activate(). Please see ActivationListener javadoc for details
when it is necessary to use activate() vs setup().
Thank you,
Vlad
On 7/29/17 19:58, Sanjay Pujare wrote:
The Javadoc comment
for com.datatorrent.api.Operator.ActivationListener<CONTEXT> (in
https://github.com/apache/apex-core/blob/master/api/src/main/java/com/datatorrent/api/Operator.java)
should hopefully answer your questions.
Specifically:
1. No, setup() is called only once in the entire lifetime (
http://apex.apache.org/docs/apex/operator_development/#setup-call)
2. Yes. When an operator is "activated" - first time in its life or
reactivation after a failover - actuvate() is called before the first
beginWindow() is called.
3. Yes.
On Sun, Jul 30, 2017 at 12:18 AM, Ananth G <ananthg.a...@gmail.com> wrote:
Hello All,
I was looking at the documentation and could not get a clear distinction
of behaviours for setup() and activate() during scenarios when an operator
is passivated ( ex: application shutdown, repartition use cases ) and being
brought back to life again. Could someone from the community advise me on
the following questions ?
1. Is setup() called in these scenarios (serialize/deserialize cycles) as
well ?
2. I am assuming activate() is called in these scenarios ? - The javadoc
for activation states that the activate() can be called multiple times (
without explicitly stating why ) and my assumption is that it is because of
these scenarios.
3. If setup() is only called once during the lifetime of an operator , is
it fair to assume that activate() is the best place to resolve all of the
transient fields of an operator ?
Regards,
Ananth
