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https://issues.apache.org/jira/browse/LUCENE-1544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-1544:
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Attachment: LUCENE-1544.patch
Patch attached.
I changed the up-front acquireWrite inside addIndexes(IndexReader[])
to an acquireRead followed by upgradeReadToWrite.
Once we remove autoCommit=true case we can greatly simplify IW -- I'm
looking forward to it!!
I plan to commit in a day or so, and back port to 2.4.1.
> Deadlock: IndexWriter.addIndexes(IndexReader[])
> -----------------------------------------------
>
> Key: LUCENE-1544
> URL: https://issues.apache.org/jira/browse/LUCENE-1544
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.4
> Environment: should be ubiquitous... but, Win XP on a MacBookPro
> (Intel) under Eclipse (Ganymede) using default compiler/runtime
> Reporter: Doug Sale
> Assignee: Michael McCandless
> Fix For: 2.4.1, 2.9
>
> Attachments: LUCENE-1544.patch, TestAddIndexes.java
>
>
> A deadlock issue occurs under the following circumstances
> - IndexWriter.autoCommit == true
> - IndexWriter.directory contains multiple segments
> - IndexWriter.AddIndex(IndexReader[]) is invoked
> I put together a JUnit test that recreates the deadlock, which I've attached.
> It is the first test method, 'testAddIndexByIndexReader()'.
> In a nutshell, here is what happens:
> // 1) AddIndexes(IndexReader[]) acquires the write lock,
> // then begins optimization of destination index (this is
> // prior to adding any external segments).
> //
> // 2) Main thread starts a ConcurrentMergeScheduler.MergeThread
> // to merge the 2 segments.
> //
> // 3) Merging thread tries to acquire the read lock at
> // IndexWriter.blockAddIndexes(boolean) in
> // IndexWriter.StartCommit(), but cannot as...
> //
> // 4) Main thread still holds the write lock, and is
> // waiting for the IndexWriter.runningMerges data structure
> // to be devoid of merges with their optimize flag
> // set (IndexWriter.optimizeMergesPending()).
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