Bubble-up exceptions from scheduler #38441
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Instead of logging warnings we now rethrow exceptions thrown inside scheduled/submitted tasks. This will still log them as warnings in production but has the added benefit that if they are thrown during unit/integration test runs, the test will be flagged as an error. Fixed NPE in GlobalCheckPointListners that caused CCR tests (IndexFollowingIT and likely others) to fail. This is a continuation of elastic#38014
henningandersen
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Pinging @elastic/es-core-infra |
jasontedor
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* 6.x: (25 commits) Backport of types removal for Put/Get index templates (elastic#38465) Add support for API keys to access Elasticsearch (elastic#38291) (elastic#38399) Deprecate support for internal versioning for concurrency control (elastic#38451) Deprecate types in rollover index API (elastic#38389) (elastic#38458) Add typless client side GetIndexRequest calls and response class (elastic#38422) [ML] Report index unavailable instead of waiting for lazy node (elastic#38444) await fix CurtIT#testIndex until elastic#38451 is merged (elastic#38466) Update ilm-api.asciidoc, point to REMOVE policy (elastic#38235) (elastic#38464) SQL: Fix esType for DATETIME/DATE and INTERVALS (elastic#38179) Clean up duplicate follow config parameter code (elastic#37688) (elastic#38443) Deprecation check for No Master Block setting (elastic#38383) Bubble-up exceptions from scheduler (elastic#38441) Lift retention lease expiration to index shard (elastic#38391) Deprecate maxRetryTimeout in RestClient and increase default value (elastic#38425) Update Rollup Caps to allow unknown fields (elastic#38446) Backport of elastic#38411: `if_seq_no` and `if_primary_term` parameters aren't wired correctly in REST Client's CRUD API Support unknown fields in ingest pipeline map configuration (elastic#38429) SQL: Implement CURRENT_DATE (elastic#38175) Backport changes to the release notes script. (elastic#38346) Fix ILM explain response to allow unknown fields (elastic#38363) ...
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@henningandersen I recently ran into an issue related to this change. I have worked around it, but I figure it's worth mentioning. I have a plugin which performs periodic tasks. I was using the threadPool.scheduler().scheduleAtFixedRate(...) call to execute said periodic tasks. Because the executor wraps the runnable in a ScheduledFuture, the afterExecute call would block, locking up the scheduler. Digging deeper, the EsExecutors.rethrowErrors checks if the runnable is a RunnableFuture, which it is, then performs a 'get', but the ScheduledFuture will block there. Anyways, the scheduleAtFixedRate method will lock up the threadPool.scheduler() instance on the first execution. |
henningandersen
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Jun 7, 2019
Though not in use in elasticsearch currently, it seems surprising that ThreadPool.scheduler().scheduleAtFixedRate would hang. A recurring scheduled task is never completed (except on failure) and we test for exceptions using RunnableFuture.get(), which hangs for periodic tasks. Fixed by checking that task is done before calling .get(). Related to elastic#38441
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@dansimpson, thanks for reporting this issue. It should be fixed by #42993 . |
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Instead of logging warnings we now rethrow exceptions thrown inside
scheduled/submitted tasks. This will still log them as warnings in
production but has the added benefit that if they are thrown during
unit/integration test runs, the test will be flagged as an error.
Fixed NPE in GlobalCheckPointListners that caused CCR tests
(IndexFollowingIT and likely others) to fail.
This is a continuation of #38014
Backports #38317