[HADOOP-2934] NPE while loading FSImage

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.17.0
• Fix Version/s: 0.17.0
• Assignee: Dhruba Borthakur
• Reporter: Raghu Angadi
• Created: 04/Mar/08 03:20
• Updated: 08/Jul/09 16:42
• Resolved: 05/Mar/08 18:34

Description

André Martin reported on core-user mailing list :

 
[...]
2008-03-02 01:25:29,887 ERROR org.apache.hadoop.dfs.NameNode: java.lang.NullPointerException
    at org.apache.hadoop.dfs.FSImage.readINodeUnderConstruction(FSImage.java:950)
    at org.apache.hadoop.dfs.FSImage.loadFilesUnderConstruction(FSImage.java:919)
    at org.apache.hadoop.dfs.FSImage.loadFSImage(FSImage.java:749)
    at org.apache.hadoop.dfs.FSImage.loadFSImage(FSImage.java:634)
    at org.apache.hadoop.dfs.FSImage.recoverTransitionRead(FSImage.java:223)
    at org.apache.hadoop.dfs.FSDirectory.loadFSImage(FSDirectory.java:79)
    at org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:261)
    at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:242)
    at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:131)
    at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:176)
    at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:162)
    at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:851)
    at org.apache.hadoop.dfs.NameNode.main(NameNode.java:860)

Block object should be allocated before calling readFields() in FSImage.java :

BlockInfo[] blocks = new BlockInfo[numBlocks];
for (int i = 0; i < numBlocks; i++) {
  blocks[i].readFields(in);
}