David Yan created APEXMALHAR-2244:
-------------------------------------
Summary: Optimize WindowedStorage and Spillable data structures
for time series
Key: APEXMALHAR-2244
URL: https://issues.apache.org/jira/browse/APEXMALHAR-2244
Project: Apache Apex Malhar
Issue Type: Sub-task
Reporter: David Yan
Assignee: Siyuan Hua
The spillable data structures currently does not make any assumption about the
key that is used in Managed State, and as a result, it uses ManagedStateImpl to
interface with Managed State. But for WindowedStorage used by WindowedOperator,
the key to the storage is a window, which is time based. Using the default
ManagedStateImpl would be wrong for event time based keys, since
ManagedStateImpl appears to purge data based on the apex window id (process
time based).
In a high level, the below summarizes roughly what needs to be done:
1. a way to tell the spillable data structures to use the
ManagedTimeUnifiedStateImpl
2. a way to tell the spillable data structures how to extract the timestamp
from the key. Note that in the case of WindowedOperator, the timestamp should
be the end timestamp of the window (beginTimeMillis + durationMillis), not the
begin timestamp.
3. a way to tell the spillable data structures how to assign the time bucket
given that timestamp
4. only purge a time bucket when all keys that belong to that time bucket are
removed
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
