Vrushali C created YARN-6850:
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Summary: Ensure that supplemented timestamp is stored only for
flow run metrics
Key: YARN-6850
URL: https://issues.apache.org/jira/browse/YARN-6850
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Vrushali C
In timeline service v2, ColumnHelper#getPutTimestamp supplements the timestamp
and is called by ColumnHelper#store. This is not conditional and called for
every put.
We need to ensure that the cell timestamps for metrics in entity and
application (and sub application) tables are "correct" timestamp since we will
be enabling TTLs for these cells.
The supplemented timestamp is to be used only in the flow run table by the
coprocessor which intercepts all reads & writes to cells in this table. It
looks at the supplemented timestamp to figure out which app id this particular
cell belongs to. This is done in order to ensure no collision occurs when two
apps belonging to same flow run write the same metric at the same timestamp.
Discovered in the discussion in YARN-4455
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