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https://issues.apache.org/jira/browse/CONNECTORS-166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13006583#comment-13006583
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Karl Wright commented on CONNECTORS-166:
----------------------------------------
According to the Derby team, Derby trunk fixes this problem. I've therefore
build trunk and checked it in.
r1081520.
> Crawl seizes up when running Derby
> ----------------------------------
>
> Key: CONNECTORS-166
> URL: https://issues.apache.org/jira/browse/CONNECTORS-166
> Project: ManifoldCF
> Issue Type: Bug
> Components: Framework crawler agent
> Affects Versions: ManifoldCF 0.1, ManifoldCF 0.2
> Reporter: Karl Wright
> Assignee: Karl Wright
>
> A crawl using multiple worker threads with Derby eventually hangs, because
> threads get deadlocked dealing with carrydown information. At the time of
> hang, a thread dump yields:
> "Worker thread '5'" daemon prio=6 tid=0x02fc7800 nid=0xd78 in Object.wait()
> [0x0465f000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> - waiting on <0x2858b720> (a
> org.apache.manifoldcf.core.database.Database$ExecuteQueryThread)
> at java.lang.Thread.join(Unknown Source)
> - locked <0x2858b720> (a
> org.apache.manifoldcf.core.database.Database$ExecuteQueryThread)
> at java.lang.Thread.join(Unknown Source)
> at
> org.apache.manifoldcf.core.database.Database.executeViaThread(Database.java:453)
> at
> org.apache.manifoldcf.core.database.Database.executeUncachedQuery(Database.java:489)
> at
> org.apache.manifoldcf.core.database.Database$QueryCacheExecutor.create(Database.java:1131)
> at
> org.apache.manifoldcf.core.cachemanager.CacheManager.findObjectsAndExecute(CacheManager.java:144)
> at
> org.apache.manifoldcf.core.database.Database.executeQuery(Database.java:168)
> at
> org.apache.manifoldcf.core.database.DBInterfaceDerby.performQuery(DBInterfaceDerby.java:785)
> at
> org.apache.manifoldcf.crawler.jobs.JobManager.processDeleteHashSet(JobManager.java:2592)
> at
> org.apache.manifoldcf.crawler.jobs.JobManager.calculateAffectedDeleteCarrydownChildren(JobManager.java:2565)
> at
> org.apache.manifoldcf.crawler.jobs.JobManager.markDocumentDeletedMultiple(JobManager.java:2494)
> at
> org.apache.manifoldcf.crawler.system.WorkerThread.processDeleteLists(WorkerThread.java:1077)
> at
> org.apache.manifoldcf.crawler.system.WorkerThread.run(WorkerThread.java:544)
> ... for at least two threads.
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