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From "Thomas Tauber-Marshall (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-5167: Reduce the number of Kudu clients created (FE)
Date Tue, 16 May 2017 16:45:39 GMT
Thomas Tauber-Marshall has uploaded a new change for review.

Change subject: IMPALA-5167: Reduce the number of Kudu clients created (FE)

IMPALA-5167: Reduce the number of Kudu clients created (FE)

Creating Kudu clients is very expensive as each will fetch
metadata from the Kudu master, so we should minimize the
number of Kudu clients that get created.

This patch stores a map from Kudu master addressed to Kudu
clients in KuduUtil to be used across the FE and catalog.
Another patch will address the BE.

This relies on a change on the Kudu side that clears
non-covered range entries from the client's cache on
table open (d07ecd6ded01201c912d2e336611a6a941f48d98).

- Ran a stress test on a 10 node cluster: scan of a small
  Kudu table, 1000 concurrent queries, load on the Kudu
  master was reduced signficantly, from ~50% cpu to ~5%.
  (with the BE changes included)
- Ran the Kudu e2e tests.
- Manually ran a test with concurrent INSERTs and
  'ALTER TABLE ADD PARTITION' (which is affected by the
  Kudu side change mentiond above) and verified

Change-Id: I9b0b346f37ee43f7f0eefe34a093eddbbdcf2a5e
M fe/src/main/java/org/apache/impala/catalog/
M fe/src/main/java/org/apache/impala/planner/
M fe/src/main/java/org/apache/impala/service/
M fe/src/main/java/org/apache/impala/util/
4 files changed, 41 insertions(+), 21 deletions(-)

  git pull ssh:// refs/changes/98/6898/1
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I9b0b346f37ee43f7f0eefe34a093eddbbdcf2a5e
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Thomas Tauber-Marshall <>

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