[OAK-4682] ConcurrentModificationException in JournalEntry.TreeNode

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.4.6, 1.5.6
• Fix Version/s: 1.4.7, 1.5.9, 1.6.0
• Component/s: core, documentmk
• Assignee: Marcel Reutegger
• Reporter: Marcel Reutegger
• Created: 18/Aug/16 14:08
• Updated: 05/Sep/16 09:33
• Resolved: 19/Aug/16 07:58

Description

The JournalDiffLoader introduced in OAK-4528 sometimes causes a ConcurrentModificationException in JournalEntry.TreeNode:

java.util.ConcurrentModificationException: null
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
	at java.util.HashMap$EntryIterator.next(HashMap.java:1463)
	at java.util.HashMap$EntryIterator.next(HashMap.java:1461)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:503)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry$TreeNode.accept(JournalEntry.java:504)
	at org.apache.jackrabbit.oak.plugins.document.JournalEntry.addTo(JournalEntry.java:312)
	at org.apache.jackrabbit.oak.plugins.document.JournalDiffLoader.readTrunkChanges(JournalDiffLoader.java:150)
	at org.apache.jackrabbit.oak.plugins.document.JournalDiffLoader.call(JournalDiffLoader.java:74)

Issue Links

• relates to: OAK-4528 diff calculation in DocumentNodeStore should try to re-use journal info on diff cache miss