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https://issues.apache.org/jira/browse/BOOKKEEPER-669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13761910#comment-13761910
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Ivan Kelly commented on BOOKKEEPER-669:
---------------------------------------
+1 for the patch, committing
> Race condition in ledger deletion and eviction from cache
> ---------------------------------------------------------
>
> Key: BOOKKEEPER-669
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-669
> Project: Bookkeeper
> Issue Type: Bug
> Components: bookkeeper-server
> Reporter: Matteo Merli
> Assignee: Rakesh R
> Fix For: 4.2.2
>
> Attachments:
> 0001-BOOKKEEPER-669-race-between-evict-and-delete-ledger.patch
>
>
> There is a race condition between when a ledger is delete and an eviction from
> LedgerCache occur.
> The resulting exception is:
> {code}
> 14:06:24.754 [SyncThread] ERROR org.apache.bookkeeper.bookie.Bookie -
> Exception in SyncThread
> java.lang.NullPointerException: null
> at
> org.apache.bookkeeper.bookie.LedgerCacheImpl.evictFileInfoIfNecessary(LedgerCacheImpl.java:809)
> ~[bookkeeper-server-4.2.1.15.jar:4.2.2-SNAPSHOT]
> at
> org.apache.bookkeeper.bookie.LedgerCacheImpl.getFileInfo(LedgerCacheImpl.java:267)
> ~[bookkeeper-server-4.2.1.15.jar:4.2.2-SNAPSHOT]
> at
> org.apache.bookkeeper.bookie.LedgerCacheImpl.flushLedger(LedgerCacheImpl.java:425)
> ~[bookkeeper-server-4.2.1.15.jar:4.2.2-SNAPSHOT]
> at
> org.apache.bookkeeper.bookie.LedgerCacheImpl.flushLedger(LedgerCacheImpl.java:382)
> ~[bookkeeper-server-4.2.1.15.jar:4.2.2-SNAPSHOT]
> at
> org.apache.bookkeeper.bookie.InterleavedLedgerStorage.flush(InterleavedLedgerStorage.java:167)
> ~[bookkeeper-server-4.2.1.15.jar:4.2.2-SNAPSHOT]
> at org.apache.bookkeeper.bookie.Bookie$SyncThread.run(Bookie.java:330)
> ~[bookkeeper-server-4.2.1.15.jar:4.2.2-SNAPSHOT]
> 14:06:24.755 [SyncThread] INFO org.apache.bookkeeper.bookie.Bookie -
> Triggering shutdown of Bookie-3181 with exitCode 5
> 14:06:24.768 [BookieShutdownTrigger] INFO
> org.apache.bookkeeper.bookie.Bookie
> - Shutting down Bookie-3181 with exitCode 5
> 14:06:24.769 [BookieJournal-3181] WARN org.apache.bookkeeper.bookie.Journal -
> Journal exits when shutting down
> {code}
> The problem is that the openLedger list is a normal LinkedList and sometimes
> is
> modified while synchronizing on fileInfoCache, other times on openLedgers, and
> in other places it is accessed without synchronizing.
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