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https://issues.apache.org/jira/browse/IMPALA-5238?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-5238.
-----------------------------------
Resolution: Fixed
Fix Version/s: Impala 2.9.0
IMPALA-5238: transfer reservations between trackers
This is a primitive needed to implement claiming and distribution
of initial reservations. It supports transferring reservation between
any two ReservationTrackers under the same query.
Also remove the public DecreaseReservation() method, which is now
mostly redundant and we have no plans to use.
Testing:
* Added a test that exercises transfer between trackers at different
levels and with different relationships.
Change-Id: I21f008abaf1aa4fcd2d854769a603b97589af3b3
Reviewed-on: http://gerrit.cloudera.org:8080/6708
Reviewed-by: Tim Armstrong <[email protected]>
Tested-by: Impala Public Jenkins
---
M be/src/runtime/bufferpool/reservation-tracker-test.cc
M be/src/runtime/bufferpool/reservation-tracker.cc
M be/src/runtime/bufferpool/reservation-tracker.h
3 files changed, 295 insertions(+), 74 deletions(-)
> Support transferring reservation between ReservationTrackers
> ------------------------------------------------------------
>
> Key: IMPALA-5238
> URL: https://issues.apache.org/jira/browse/IMPALA-5238
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.9.0
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Labels: reservation
> Fix For: Impala 2.9.0
>
>
> In order to support claiming reservation atomically (IMPALA-3748) and
> distributing it to different execution nodes, we need to add a transfer
> operation to ReservationTrackers.
> The idea is that we would claim all the reservation in a single shared
> "initial reservation" tracker, then individual nodes could claim their share
> from there. When a node is closed, and other node that executes after it
> depends on getting its reservation, it would have to deposit its initial
> reservation back into the "initial reservation" tracker (or transfer it
> directly to the other node).
> This operation should
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