Hello Tidy Bot, Kudu Jenkins,
I'd like you to reexamine a change. Please visit
http://gerrit.cloudera.org:8080/13632
to look at the new patch set (#2).
Change subject: KUDU-2823 Place tablet replicas based on range
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KUDU-2823 Place tablet replicas based on range
When we add a new range to the fact table, we expect the newly
created tablet to be evenly distributed on each tablet server.
This is especially important when we use time as the range key.
The more recent the data, the hotter it gets. We expect hot tablets
on the cluster to be evenly distributed.
Unfortunately, after we add some new tablet servers to the cluster,
creating a new tablet replica will prioritize the new tablet server for
placement according to the current placement policy. This is because
we prefer to select tablet server which a smaller number of tablet
replicas. This will cause hot tablets to be concentrated on these new
tablet servers.
So, I added a new placement policy. When creating a new tablet replica,
we prefer to select tablet server which a smaller number of tablet
replicas in the range. This will ensure that the hot tablets are evenly
distributed in the cluster. This applies to scenarios where the range
keys of most tables in the cluster are the same.
You can decide whether to use this feature by setting
'--master_place_tablet_replicas_based_on_range'.
Change-Id: I48a225e221eb42ef2f5489687e80a151d8dc1a42
---
M src/kudu/integration-tests/create-table-itest.cc
M src/kudu/master/catalog_manager.cc
M src/kudu/master/master.proto
M src/kudu/master/master_service.cc
M src/kudu/master/placement_policy-test.cc
M src/kudu/master/placement_policy.cc
M src/kudu/master/placement_policy.h
M src/kudu/master/ts_descriptor.cc
M src/kudu/master/ts_descriptor.h
M src/kudu/tserver/heartbeater.cc
M src/kudu/tserver/ts_tablet_manager.cc
M src/kudu/tserver/ts_tablet_manager.h
12 files changed, 371 insertions(+), 55 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/32/13632/2
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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I48a225e221eb42ef2f5489687e80a151d8dc1a42
Gerrit-Change-Number: 13632
Gerrit-PatchSet: 2
Gerrit-Owner: Yao Xu <oclarms....@gmail.com>
Gerrit-Reviewer: Kudu Jenkins (120)
Gerrit-Reviewer: Tidy Bot (241)
