Hello Quanlong Huang, Impala Public Jenkins,
I'd like you to reexamine a change. Please visit
http://gerrit.cloudera.org:8080/24711
to look at the new patch set (#3).
Change subject: IMPALA-15234: Add a way to clear the HBO cache
......................................................................
IMPALA-15234: Add a way to clear the HBO cache
HBO keeps historical runs in a per-coordinator cache inside the
frontend. Once a run that no longer describes the data is stored, for
example after a table is overwritten with a very different
distribution, it keeps influencing plans until it is evicted. End to
end tests have the same problem in reverse: a run stored by an earlier
query can satisfy a later assertion.
Add CacheBackend.clear(), reachable from the backend through a new
clearHboStats() JNI entry point, and expose it as the /clear_hbo_stats
WebUI endpoint, following the existing /resource_pool_reset. As the
JIRA suggests, this drops the cache as a whole: entries are keyed by
hash strings, so the ones belonging to a given table cannot be
identified.
The cache lives in the frontend of each coordinator, so the endpoint
clears the coordinator that serves the request.
Testing:
- InMemoryCacheBackendTest
- TestHBO::test_clear_hbo_cache
Change-Id: Ib58305e96f05ba49eb03d935765620915964308a
Assisted-by: claude-opus-5 (Claude Code)
---
M be/src/service/frontend.cc
M be/src/service/frontend.h
M be/src/service/impala-http-handler.cc
M be/src/service/impala-http-handler.h
M fe/src/main/java/org/apache/impala/service/CacheBackend.java
M fe/src/main/java/org/apache/impala/service/HistoricalStats.java
M fe/src/main/java/org/apache/impala/service/InMemoryCacheBackend.java
M fe/src/main/java/org/apache/impala/service/JniFrontend.java
A fe/src/test/java/org/apache/impala/service/InMemoryCacheBackendTest.java
M tests/query_test/test_hbo.py
10 files changed, 142 insertions(+), 1 deletion(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/11/24711/3
--
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ib58305e96f05ba49eb03d935765620915964308a
Gerrit-Change-Number: 24711
Gerrit-PatchSet: 3
Gerrit-Owner: Aleksandr Efimov <[email protected]>
Gerrit-Reviewer: Aleksandr Efimov <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Quanlong Huang <[email protected]>
