Todd Lipcon created HDFS-4380: --------------------------------- Summary: Opening a file for read before writer writes a block causes NPE Key: HDFS-4380 URL: https://issues.apache.org/jira/browse/HDFS-4380 Project: Hadoop HDFS Issue Type: Bug Affects Versions: 1.0.3 Reporter: Todd Lipcon
JD Cryans found this issue: it seems like, if you open a file for read immediately after it's been created by the writer, after a block has been allocated, but before the block is created on the DNs, then you can end up with the following NPE: java.lang.NullPointerException at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.updateBlockInfo(DFSClient.java:1885) at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1858) at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.<init>(DFSClient.java:1834) at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:578) at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:154) This seems to be because {{getBlockInfo}} returns a null block when the DN doesn't yet have the replica. The client should probably either fall back to a different replica or treat it as zero-length. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira