[jira] [Created] (BOOKKEEPER-568) NPE during GC with HierarchicalLedgerManager

["Matteo Merli (JIRA)" <ji...@apache.org>]

Matteo Merli created BOOKKEEPER-568:
---------------------------------------

             Summary: NPE during GC with HierarchicalLedgerManager
                 Key: BOOKKEEPER-568
                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-568
             Project: Bookkeeper
          Issue Type: Bug
          Components: bookkeeper-server
    Affects Versions: 4.2.0
            Reporter: Matteo Merli
            Priority: Minor


{noformat}
2013-02-11 14:06:28,904 - WARN  - [GarbageCollectorThread:ScanAndCompareGarbageCollector@103] - Exception when iterating over the metadata {}
java.io.IOException: Error when check more elements
	at org.apache.bookkeeper.meta.HierarchicalLedgerManager$HierarchicalLedgerRangeIterator.hasNext(HierarchicalLedgerManager.java:423)
	at org.apache.bookkeeper.bookie.ScanAndCompareGarbageCollector.gc(ScanAndCompareGarbageCollector.java:75)
	at org.apache.bookkeeper.bookie.GarbageCollectorThread.doGcLedgers(GarbageCollectorThread.java:302)
	at org.apache.bookkeeper.bookie.GarbageCollectorThread.run(GarbageCollectorThread.java:271)
Caused by: java.lang.NullPointerException
	at org.apache.bookkeeper.meta.HierarchicalLedgerManager$HierarchicalLedgerRangeIterator.hasNext(HierarchicalLedgerManager.java:419)
	... 3 more
{noformat}

In the code below, l2NodesIter appears to be null.

{code}
public boolean hasNext() throws IOException {
   try {
      if (l1NodesIter == null) {
          l1NodesIter = zk.getChildren(ledgerRootPath, null).iterator();
          hasMoreElement = nextL1Node();
      } else if (!l2NodesIter.hasNext()) {
          hasMoreElement = nextL1Node();
      }
   } catch (Exception e) {
      throw new IOException("Error when check more elements", e);
   }
   return hasMoreElement;
}
{code}

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