[CONNECTORS-220] Database errors cause all worker threads (and the corresponding stuffer thread) to wait indefinitely

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: ManifoldCF 0.1, ManifoldCF 0.2, ManifoldCF 0.3
• Fix Version/s: ManifoldCF 0.3
• Component/s: Framework crawler agent
• Assignee: Karl Wright
• Reporter: Karl Wright
• Created: 06/Jul/11 19:39
• Updated: 08/Jul/11 15:21
• Resolved: 08/Jul/11 15:21

Description

When ManifoldCF gets a database error from a thread, it tries to recover by resetting all threads to a known state. Unfortunately this code seems to fail, and you wind up with a frozen crawl with all worker threads in the following state:

"Worker thread '36'" daemon prio=6 tid=0x00000000077ed000 nid=0xa98 in Object.wait() [0x000000000b1af000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at org.apache.manifoldcf.crawler.system.ResetManager.waitForReset(ResetManager.java:107)

• locked <0x00000000e0005528> (a org.apache.manifoldcf.crawler.system.WorkerResetManager)
  at org.apache.manifoldcf.crawler.system.WorkerThread.run(WorkerThread.java:110)