Sounds like a problem with the hostnames of your datanodes.
Check that your are able to ping all the datanodes with the hostnames
they had send to the namenode.
check:
bin/nutch ndfs -report to see the hostnames.
Stefan
Am 24.11.2005 um 16:04 schrieb Anton Potehin:
When we start namenode and datenode on one host and then try get
file from ndfs from another host we get error:
Exception in thread "main" java.lang.NullPointerException
at java.net.Socket.<init>(Socket.java:301)
at java.net.Socket.<init>(Socket.java:153)
at org.apache.nutch.ndfs.NDFSClient
$NDFSInputStream.blockSeekTo(NDFSClient.java:339)
at org.apache.nutch.ndfs.NDFSClient$NDFSInputStream.read
(NDFSClient.java:429)
at org.apache.nutch.fs.NFSDataInputStream$PositionCache.read
(NFSDataInputStream.java:152)
at java.io.BufferedInputStream.fill
(BufferedInputStream.java:183)
at java.io.BufferedInputStream.read1
(BufferedInputStream.java:222)
at java.io.BufferedInputStream.read
(BufferedInputStream.java:277)
at java.io.DataInputStream.readFully(DataInputStream.java:266)
at java.io.DataInputStream.readFully(DataInputStream.java:242)
at org.apache.nutch.fs.NFSDataInputStream$Checker.<init>
(NFSDataInputStream.java:53)
at org.apache.nutch.fs.NFSDataInputStream.<init>
(NFSDataInputStream.java:217)
at org.apache.nutch.fs.NutchFileSystem.open
(NutchFileSystem.java:143)
at org.apache.nutch.fs.NutchFileSystem.open
(NutchFileSystem.java:132)
at org.apache.nutch.fs.NDFSFileSystem.copyToLocalFile
(NDFSFileSystem.java:216)
at org.apache.nutch.fs.NDFSFileSystem.copyToLocalFile
(NDFSFileSystem.java:212)
at org.apache.nutch.fs.TestClient.copyToLocal
(TestClient.java:61)
at org.apache.nutch.fs.TestClient.main(TestClient.java:238)
If we get file from first host everything is fine.
How work out this problem ?
We try use jdk 1.4. and jdk1.5 results the same.
