[fix] [ml] The atomicity of multiple fields of ml is broken - #19346
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codelipenghui
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Jan 29, 2023
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As #16420 cherry-picked into the previous branches, I've added labels too. |
labuladong
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Jan 29, 2023
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| synchronized (ManagedLedgerImpl.this) { | ||
| ledgers.put(lh.getId(), newLedger); | ||
| currentLedger = lh; | ||
| currentLedgerEntries = 0; | ||
| currentLedgerSize = 0; | ||
| updateLedgersIdsComplete(); | ||
| mbean.addLedgerSwitchLatencySample(System.currentTimeMillis() |
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Is it necessary to move updateLedgersIdsComplete() into the synchronized block? I see before #16420 this method is out of synchronized too.
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Yes, it is not necessary. But it should be executed after these fields changes.
labuladong
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Jan 29, 2023
Codecov Report
@@ Coverage Diff @@
## master #19346 +/- ##
=============================================
+ Coverage 32.45% 64.01% +31.56%
- Complexity 6348 25871 +19523
=============================================
Files 1644 1818 +174
Lines 123737 133112 +9375
Branches 13494 14644 +1150
=============================================
+ Hits 40162 85218 +45056
+ Misses 77654 40085 -37569
- Partials 5921 7809 +1888
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Technoboy-
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Jan 29, 2023
Technoboy-
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liangyepianzhou
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(cherry picked from commit e2851da)
nicoloboschi
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Motivation
ML uses synchronized to guarantee the atomicity of modifications to variables
ledgers,currentLedger,currentLedgerEntriesandcurrentLedgerSize, but PR #16420 breaks atomicity, resulting in incorrect results when using those variables(E.g calculate backlog size by special position)https://github.com/apache/pulsar/pull/16420/files#diff-f6a849bd8fdb782ef6c17a2e07a2c54c3dc7d1655c00ec3546d5f3b3fc61e970L1485-R1499
Modifications
Make changes to these variables within the synchronized block.
Documentation
docdoc-requireddoc-not-neededdoc-completeMatching PR in forked repository
PR in forked repository: