Hi Divya, The exceptions indicate that the HDFS client failed to establish a network connection to a datanode hosting a block that the client is trying to read. After too many of these failures (default 3, but configurable), the HDFS client aborts the read and this bubbles up to the caller with the "could not obtain block" error.
I recommend troubleshooting this as a network connectivity issue. This wiki page includes a few tips as a starting point: http://wiki.apache.org/hadoop/TroubleShooting Hope this helps, Chris Nauroth Hortonworks http://hortonworks.com/ On Fri, Oct 25, 2013 at 4:53 AM, Divya R <avyakr...@gmail.com> wrote: > Hi Guys, > > I'm indexing data (~50 -100GB per day) from hadoop. Hadoop is Running in > cluster mode (having 2 dataNaodes currently). After every two or three > hours I'm getting this exception. But both Data nodes are up and running. > Can any one please guide me as to what I should do or If I'm doing wrong. > > Code Snippet: > public InitHadoop() { > > configuration = new Configuration(); > configuration.set("fs.default.name", "hdfs://<<namenode > IP>>:54310"); // Is this write to specify on namenode IP.? > configuration.set("mapred.job.tracker", "hdfs://<<namenode > IP>>:54311"); > > try { > fileSystem = FileSystem.get(configuration); > } catch (IOException e) { > e.printStackTrace(); > } > } > private void indexDocument(FSDataInputStream file) { > > Scanner scanner = new Scanner(file); > > while (scanner.hasNext() != null) { > // Indexing code > } > } > } > > Logs: > > 2013-10-25 09:37:57 WARN DFSClient:2266 - Failed to connect to > /<<IP>>:50010, add to deadNodes and continuejava.net.BindException: Cannot > assign requested address > 2013-10-25 09:37:57 WARN DFSClient:2266 - Failed to connect to > /<<IP>>:50010, add to deadNodes and continuejava.net.BindException: Cannot > assign requested address > 2013-10-25 09:37:57 INFO DFSClient:2432 - Could not obtain block > blk_-8795538519317154213_432897 from any node: java.io.IOException: No live > nodes contain current block. Will get new block locations from namenode and > retry... > 2013-10-25 09:37:58 WARN DFSClient:2266 - Failed to connect to > /<<IP>>:50010, add to deadNodes and continuejava.net.BindException: Cannot > assign requested address > 2013-10-25 09:37:58 WARN DFSClient:2266 - Failed to connect to > /<<IP>>:50010, add to deadNodes and continuejava.net.BindException: Cannot > assign requested address > 2013-10-25 09:37:58 INFO DFSClient:2432 - Could not obtain block > blk_-5974673190155585497_432671 from any node: java.io.IOException: No live > nodes contain current block. Will get new block locations from namenode and > retry... > 2013-10-25 09:37:59 WARN DFSClient:2266 - Failed to connect to > /<<IP>>:50010, add to deadNodes and continuejava.net.BindException: Cannot > assign requested address > 2013-10-25 09:37:59 WARN DFSClient:2266 - Failed to connect to > /<<IP>>:50010, add to deadNodes and continuejava.net.BindException: Cannot > assign requested address > 2013-10-25 09:37:59 INFO DFSClient:2432 - Could not obtain block > blk_-1662761320365439855_431653 from any node: java.io.IOException: No live > nodes contain current block. Will get new block locations from namenode and > retry... > 2013-10-25 09:37:59 WARN DFSClient:2266 - Failed to connect to > /<<IP>>:50010, add to deadNodes and continuejava.net.BindException: Cannot > assign requested address > 2013-10-25 09:37:59 WARN DFSClient:2266 - Failed to connect to > /<<IP>>:50010, add to deadNodes and continuejava.net.BindException: Cannot > assign requested address > 2013-10-25 09:37:59 WARN DFSClient:2400 - DFS Read: java.io.IOException: > Could not obtain block: blk_8826777676488299245_432528 > file=/flume/<<File.Name>>.1382639351042 > at > > org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:2426) > at > > org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:2218) > at > org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:2381) > at java.io.DataInputStream.read(DataInputStream.java:149) > at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283) > at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325) > at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177) > at java.io.InputStreamReader.read(InputStreamReader.java:184) > > Regards, > -Divya > -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
