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Handle scheduler exceptions #38014

Merged
merged 3 commits into from
Jan 31, 2019
Merged

Handle scheduler exceptions #38014

merged 3 commits into from
Jan 31, 2019

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henningandersen
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This is a continuation of #28667, #36137 and also fixes #37708. The goal is to log warnings on all exceptions thrown out of Runnables passed to Scheduler.schedule. There were no usages of the "Future.get()" on the ScheduledFuture returned from schedule and we have therefore redefined the semantics to be that scheduled tasks should never fail and if they do this should always be logged as a warning.

Parts of this will be backported to 6.x, notably we will avoid following breaking changes (breaking-java label only applies to 7.0):

  1. Keep Scheduler.schedule with old signature. This way 6.x remains backwards compatible while we can still use the new safe method everywhere. The signature change of schedule was primarily motivated in this (and that the new order is more in line with ScheduledExecutorService.schedule).
  2. Keep Processor.Parameters.scheduler as is in 6.x
  3. Keep ThreadWatchDog (in particular newInstance) as is in 6.x

Please pay special attention to the change in Processor.Parameters, I would like input on the todo in that file.

@henningandersen
Log warnings on exceptions in Scheduler
bf7259c 
Scheduler.schedule(...) would previously assume that caller handles
exception by calling get() on the returned ScheduledFuture.
schedule() now returns a ScheduledCancellable that no longer gives
access to the exception. Instead, any exception thrown out of a
scheduled Runnable is logged as a warning.

This is a continuation of elastic#28667, elastic#36317 and also fixes elastic#37708.
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Pinging @elastic/es-core-infra

@henningandersen henningandersen mentioned this pull request Jan 30, 2019
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ywelsch
ywelsch suggested changes Jan 30, 2019
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I've done a first pass. Overall looking good.

qa/evil-tests/src/test/java/org/elasticsearch/threadpool/EvilThreadPoolTests.java Show resolved Hide resolved
server/src/main/java/org/elasticsearch/ingest/Processor.java Outdated Show resolved Hide resolved
server/src/main/java/org/elasticsearch/threadpool/CancellableAdapter.java Outdated Show resolved Hide resolved
server/src/main/java/org/elasticsearch/threadpool/ScheduledCancellableAdapter.java Show resolved Hide resolved
server/src/main/java/org/elasticsearch/threadpool/Scheduler.java Outdated Show resolved Hide resolved
server/src/main/java/org/elasticsearch/threadpool/Scheduler.java Outdated Show resolved Hide resolved
server/src/main/java/org/elasticsearch/threadpool/Scheduler.java Outdated Show resolved Hide resolved
server/src/main/java/org/elasticsearch/transport/TransportService.java Outdated Show resolved Hide resolved
server/src/test/java/org/elasticsearch/threadpool/SchedulerTests.java Outdated Show resolved Hide resolved
server/src/test/java/org/elasticsearch/threadpool/SchedulerTests.java Outdated Show resolved Hide resolved
@henningandersen
Log warnings on exceptions in Scheduler
eac37ad 
Fixed review comments: removed todo, use FutureUtils.cancel and removed
scheduler task decoration since this adds more complexity than it
benefits.

This is a continuation of elastic#28667, elastic#36137 and also fixes elastic#37708.
@henningandersen
Merge remote-tracking branch 'origin/master' into handle_scheduler_ex…
5042d7b 
…ceptions
@henningandersen henningandersen force-pushed the handle_scheduler_exceptions branch from 4d7be7a to 5042d7b Compare January 30, 2019 15:24
@henningandersen
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@elasticmachine please run elasticsearch-ci/2

ywelsch
ywelsch approved these changes Jan 30, 2019
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LGTM

@henningandersen henningandersen merged commit 68ed72b into elastic:master Jan 31, 2019
jasontedor added a commit to jasontedor/elasticsearch that referenced this pull request Jan 31, 2019
@jasontedor
Merge remote-tracking branch 'elastic/master' into retention-leases-v…
2d3772c 
…ersion

* elastic/master:
  Do not set up NodeAndClusterIdStateListener in test (elastic#38110)
  ML: better handle task state race condition (elastic#38040)
  Soft-deletes policy should always fetch latest leases (elastic#37940)
  Handle scheduler exceptions (elastic#38014)
  Minor logging improvements (elastic#38084)
  Fix Painless void return bug (elastic#38046)
  Update PutFollowAction serialization post-backport (elastic#37989)
  fix a few versionAdded values in ElasticsearchExceptions (elastic#37877)
  Reenable BWC tests after backport of elastic#37899 (elastic#38093)
  Mute failing test
  Mute failing test
  Fail start on obsolete indices documentation (elastic#37786)
  SQL: Implement FIRST/LAST aggregate functions (elastic#37936)
  Un-mute NoMasterNodeIT.testNoMasterActionsWriteMasterBlock
  remove unused parser fields in RemoteResponseParsers
henningandersen added a commit to henningandersen/elasticsearch that referenced this pull request Feb 1, 2019
@henningandersen
Handle scheduler exceptions (elastic#38014)
09f661f 
Scheduler.schedule(...) would previously assume that caller handles
exception by calling get() on the returned ScheduledFuture.
schedule() now returns a ScheduledCancellable that no longer gives
access to the exception. Instead, any exception thrown out of a
scheduled Runnable is logged as a warning.

In this backport to 6.x, source backwards compatibility is maintained
and some of the changes has therefore not been carried out (notably
the signature change on Processor.Parameters.scheduler).

This is a continuation of elastic#28667, elastic#36137 and also fixes elastic#37708.
@henningandersen henningandersen mentioned this pull request Feb 1, 2019
Merged
henningandersen added a commit to henningandersen/elasticsearch that referenced this pull request Feb 4, 2019
@henningandersen
Bubble-up exceptions from scheduler
fa0cd59 
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.

This is a continuation of elastic#38014
@henningandersen henningandersen mentioned this pull request Feb 4, 2019
Merged
henningandersen added a commit to henningandersen/elasticsearch that referenced this pull request Feb 5, 2019
@henningandersen
Bubble-up exceptions from scheduler
472cd4c 
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 henningandersen mentioned this pull request Feb 5, 2019
Merged
henningandersen added a commit that referenced this pull request Feb 5, 2019
@henningandersen
Bubble-up exceptions from scheduler (#38441)
d0ac828 
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 GlobalCheckPointListeners that caused CCR tests
(IndexFollowingIT and likely others) to fail.

This is a continuation of #38014

Backports #38317
henningandersen added a commit that referenced this pull request Feb 5, 2019
@henningandersen
Bubble-up exceptions from scheduler (#38317)
20c66c5 
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.

This is a continuation of #38014

Fixed NPE that caused CCR tests (IndexFollowingIT and likely others)
to fail.

schedule could bubble rejected exception to uncaught exception
handler when not using SAME executor if thread pool is terminated.
Now ignore rejected exception silently if executor is shutdown.
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@ywelsch ywelsch ywelsch approved these changes

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CI: EvilThreadPoolTests.testExecutionExceptionOnSinglePrioritizingThreadPoolExecutor fails
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@henningandersen @elasticmachine @ywelsch @colings86