Hello Quanlong Huang, Impala Public Jenkins,
I'd like you to reexamine a change. Please visit
http://gerrit.cloudera.org:8080/24824
to look at the new patch set (#2).
Change subject: IMPALA-14598: Add HDFS backend for HBO cache
......................................................................
IMPALA-14598: Add HDFS backend for HBO cache
Add an optional per-coordinator HBO backend that keeps normal cache
access in memory and periodically persists the cache to HDFS.
Snapshot restore is asynchronous and fail-open, so unavailable HDFS
does not block coordinator startup. Snapshots use a versioned format
with bounded fields and per-entry checksums. They are written through a
temporary file, synced, and atomically renamed.
Restored entries do not overwrite newer values written after startup.
A final bounded checkpoint runs during graceful shutdown. Striped locks
also prevent lost updates between threads in one coordinator.
Each coordinator must use a unique stable snapshot path. This backend
does not provide a shared cache between coordinators.
Testing:
- Full impalad build.
- HdfsCacheBackendTest and RedisCacheBackendTest (14 tests).
- MiniHDFS graceful-restart and SIGKILL recovery scenarios.
- Isolated restart validation against HDFS.
Assisted-by: gpt-5.6-sol (OpenAI Codex)
Change-Id: Ifda33dcfed88bd17359cef84f2069c72ef7b0dd9
---
M be/src/service/frontend.cc
M be/src/service/frontend.h
M be/src/service/impala-server.cc
M be/src/util/backend-gflag-util.cc
M common/thrift/BackendGflags.thrift
M fe/src/main/java/org/apache/impala/service/BackendConfig.java
M fe/src/main/java/org/apache/impala/service/CacheBackend.java
M fe/src/main/java/org/apache/impala/service/CacheBackendFactory.java
A fe/src/main/java/org/apache/impala/service/HdfsCacheBackend.java
M fe/src/main/java/org/apache/impala/service/HistoricalStats.java
M fe/src/main/java/org/apache/impala/service/HistoricalStatsValue.java
M fe/src/main/java/org/apache/impala/service/InMemoryCacheBackend.java
M fe/src/main/java/org/apache/impala/service/JniFrontend.java
M fe/src/main/java/org/apache/impala/service/RedisCacheBackend.java
A fe/src/test/java/org/apache/impala/service/HdfsCacheBackendTest.java
M fe/src/test/java/org/apache/impala/service/RedisCacheBackendTest.java
A tests/custom_cluster/test_hbo_hdfs.py
17 files changed, 1,075 insertions(+), 73 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/24/24824/2
--
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ifda33dcfed88bd17359cef84f2069c72ef7b0dd9
Gerrit-Change-Number: 24824
Gerrit-PatchSet: 2
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]>
