Re: issues with hadoop in AIX
Allen Wittenauer wrote: On 12/27/08 12:18 AM, Arun Venugopal arunvenugopa...@gmail.com wrote: Yes, I was able to run this on AIX as well with a minor change to the DF.java code. But this was more of a proof of concept than on a production system. There are lots of places where Hadoop (esp. in contrib) interprets the output of Unix command line utilities. Changes like this are likely going to be required for AIX and other Unix systems that aren't being used by a committer. :( that aren't being used in the test process, equally importantly I think hudson runs on Solaris, doesn't it?
Re: issues with hadoop in AIX
02:36:57 WARN dfs.DFSClient: Error Recovery for block null bad datanode[0]* *$* This is the only error I am seeing in the log files. My first doubt was if the issue was due to IBM JDK. To verify this I tried to run Hadoop using IBM JDK in Linux (FC 9) machine and it worked perfectly. It would be a great help if someone could give me some pointers on what I can try to solve / debug this error. Thanks, Arun -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21156899.html Sent from the Hadoop core-user mailing list archive at Nabble.com. -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21168778.html Sent from the Hadoop core-user mailing list archive at Nabble.com. -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21209012.html Sent from the Hadoop core-user mailing list archive at Nabble.com.
Re: issues with hadoop in AIX
On 12/27/08 12:18 AM, Arun Venugopal arunvenugopa...@gmail.com wrote: Yes, I was able to run this on AIX as well with a minor change to the DF.java code. But this was more of a proof of concept than on a production system. There are lots of places where Hadoop (esp. in contrib) interprets the output of Unix command line utilities. Changes like this are likely going to be required for AIX and other Unix systems that aren't being used by a committer. :(
Re: issues with hadoop in AIX
On Dec 25, 2008, at 11:14 AM, ps40 wrote: Thanks for replying. Are you guys using Hadoop on Solaris in a production environment? Yes! It's worked well so far (we switched our first Solaris server onto Hadoop about 2 weeks ago, so it's not like we have a plethora of experience). We're running it on a Sun Thumper on a large ZFS RAID pool. We are discussing turning on a second Thumper with a non-RAID configuration, and will be observing the difference. It's all Sun Java, so we don't really notice the difference. I don't have any experience using the IBM JDK, so AIX might be a tougher cookie. Brian Brian Bockelman wrote: Hey, I can attest that Hadoop works on Solaris 10 just fine. Brian On Dec 24, 2008, at 10:26 AM, ps40 wrote: Hi, I saw that a fix was created for this issue. Were you able to run hadoop on AIX after this? We are in a similar situation and are wondering if hadoop will work on AIX and Solaris. Thanks Arun Venugopal-2 wrote: Hi, I am evaluating Hadoop's Portability Across Heterogeneous Hardware and Software Platforms. For this I am trying to setup a grid (Hadoop 0.17) having Linux ( RHEL5 / FC 9), Solaris (SunOS 5) and AIX (5.3). I was able to setup a grid with 10 Linux machines and run some basic grid jobs on it. I was also able to setup and start off a standalone grid in an AIX machine. But when I try to copy data into this (AIX) grid, I get the following error – *$ /opt/hadoop/bin/hadoop dfs -ls* *ls: Cannot access .: No such file or directory.* *$ /opt/hadoop/bin/hadoop dfs -copyFromLocal option_100_data.csv option_100_data.csv* *08/08/13 02:36:50 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org .apache .hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * *at org.apache.hadoop.dfs.NameNode.addBlock(NameNode.java: 300)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun .reflect .NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun .reflect .DelegatingMethodAccessorImpl .invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)* *at org.apache.hadoop.ipc.Server$Handler.run(Server.java: 896)* * * *at org.apache.hadoop.ipc.Client.call(Client.java:557)* *at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)* *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun .reflect .NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun .reflect .DelegatingMethodAccessorImpl .invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org .apache .hadoop .io .retry .RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java: 82) * *at org .apache .hadoop .io .retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java: 59) * *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at org.apache.hadoop.dfs.DFSClient $DFSOutputStream.locateFollowingBlock(DFSClient.java:2334) * *at org.apache.hadoop.dfs.DFSClient $DFSOutputStream.nextBlockOutputStream(DFSClient.java:2219) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.access $1700(DFSClient.java:1702) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream $DataStreamer.run(DFSClient.java:1842) * * * *08/08/13 02:36:50 WARN dfs.DFSClient: NotReplicatedYetException sleeping /user/hadoop/option_100_data.csv retries left 4* *08/08/13 02:36:51 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org .apache .hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * * * ** * * *08/08/13 02:36:57 WARN dfs.DFSClient: Error Recovery for block null bad datanode[0]* *$* This is the only error I am seeing in the log files. My first doubt was if the issue was due to IBM JDK. To verify this I tried to run Hadoop using IBM JDK in Linux (FC 9) machine and it worked perfectly. It would be a great help if someone could give me some pointers on what I can try to solve / debug this error. Thanks, Arun -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21156899.html Sent from the Hadoop core-user mailing list archive at Nabble.com. -- View this message in context: http://www.nabble.com
Re: issues with hadoop in AIX
this error. Thanks, Arun -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21156899.html Sent from the Hadoop core-user mailing list archive at Nabble.com. -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21168778.html Sent from the Hadoop core-user mailing list archive at Nabble.com.
Re: issues with hadoop in AIX
Thanks for replying. Are you guys using Hadoop on Solaris in a production environment? Brian Bockelman wrote: Hey, I can attest that Hadoop works on Solaris 10 just fine. Brian On Dec 24, 2008, at 10:26 AM, ps40 wrote: Hi, I saw that a fix was created for this issue. Were you able to run hadoop on AIX after this? We are in a similar situation and are wondering if hadoop will work on AIX and Solaris. Thanks Arun Venugopal-2 wrote: Hi, I am evaluating Hadoop's Portability Across Heterogeneous Hardware and Software Platforms. For this I am trying to setup a grid (Hadoop 0.17) having Linux ( RHEL5 / FC 9), Solaris (SunOS 5) and AIX (5.3). I was able to setup a grid with 10 Linux machines and run some basic grid jobs on it. I was also able to setup and start off a standalone grid in an AIX machine. But when I try to copy data into this (AIX) grid, I get the following error – *$ /opt/hadoop/bin/hadoop dfs -ls* *ls: Cannot access .: No such file or directory.* *$ /opt/hadoop/bin/hadoop dfs -copyFromLocal option_100_data.csv option_100_data.csv* *08/08/13 02:36:50 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org .apache .hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * *at org.apache.hadoop.dfs.NameNode.addBlock(NameNode.java: 300)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun .reflect .NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun .reflect .DelegatingMethodAccessorImpl .invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)* *at org.apache.hadoop.ipc.Server$Handler.run(Server.java: 896)* * * *at org.apache.hadoop.ipc.Client.call(Client.java:557)* *at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)* *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun .reflect .NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun .reflect .DelegatingMethodAccessorImpl .invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org .apache .hadoop .io .retry .RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82) * *at org .apache .hadoop .io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java: 59) * *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at org.apache.hadoop.dfs.DFSClient $DFSOutputStream.locateFollowingBlock(DFSClient.java:2334) * *at org.apache.hadoop.dfs.DFSClient $DFSOutputStream.nextBlockOutputStream(DFSClient.java:2219) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.access $1700(DFSClient.java:1702) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream $DataStreamer.run(DFSClient.java:1842) * * * *08/08/13 02:36:50 WARN dfs.DFSClient: NotReplicatedYetException sleeping /user/hadoop/option_100_data.csv retries left 4* *08/08/13 02:36:51 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org .apache .hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * * * ** * * *08/08/13 02:36:57 WARN dfs.DFSClient: Error Recovery for block null bad datanode[0]* *$* This is the only error I am seeing in the log files. My first doubt was if the issue was due to IBM JDK. To verify this I tried to run Hadoop using IBM JDK in Linux (FC 9) machine and it worked perfectly. It would be a great help if someone could give me some pointers on what I can try to solve / debug this error. Thanks, Arun -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21156899.html Sent from the Hadoop core-user mailing list archive at Nabble.com. -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21168778.html Sent from the Hadoop core-user mailing list archive at Nabble.com.
Re: issues with hadoop in AIX
Hi, I saw that a fix was created for this issue. Were you able to run hadoop on AIX after this? We are in a similar situation and are wondering if hadoop will work on AIX and Solaris. Thanks Arun Venugopal-2 wrote: Hi, I am evaluating Hadoop's Portability Across Heterogeneous Hardware and Software Platforms. For this I am trying to setup a grid (Hadoop 0.17) having Linux ( RHEL5 / FC 9), Solaris (SunOS 5) and AIX (5.3). I was able to setup a grid with 10 Linux machines and run some basic grid jobs on it. I was also able to setup and start off a standalone grid in an AIX machine. But when I try to copy data into this (AIX) grid, I get the following error – *$ /opt/hadoop/bin/hadoop dfs -ls* *ls: Cannot access .: No such file or directory.* *$ /opt/hadoop/bin/hadoop dfs -copyFromLocal option_100_data.csv option_100_data.csv* *08/08/13 02:36:50 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org.apache.hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * *at org.apache.hadoop.dfs.NameNode.addBlock(NameNode.java:300)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)* *at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)* * * *at org.apache.hadoop.ipc.Client.call(Client.java:557)* *at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)* *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82) * *at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59) * *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:2334) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2219) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.access$1700(DFSClient.java:1702) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:1842) * * * *08/08/13 02:36:50 WARN dfs.DFSClient: NotReplicatedYetException sleeping /user/hadoop/option_100_data.csv retries left 4* *08/08/13 02:36:51 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org.apache.hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * * * ** * * *08/08/13 02:36:57 WARN dfs.DFSClient: Error Recovery for block null bad datanode[0]* *$* This is the only error I am seeing in the log files. My first doubt was if the issue was due to IBM JDK. To verify this I tried to run Hadoop using IBM JDK in Linux (FC 9) machine and it worked perfectly. It would be a great help if someone could give me some pointers on what I can try to solve / debug this error. Thanks, Arun -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21156899.html Sent from the Hadoop core-user mailing list archive at Nabble.com.
Re: issues with hadoop in AIX
Hey, I can attest that Hadoop works on Solaris 10 just fine. Brian On Dec 24, 2008, at 10:26 AM, ps40 wrote: Hi, I saw that a fix was created for this issue. Were you able to run hadoop on AIX after this? We are in a similar situation and are wondering if hadoop will work on AIX and Solaris. Thanks Arun Venugopal-2 wrote: Hi, I am evaluating Hadoop's Portability Across Heterogeneous Hardware and Software Platforms. For this I am trying to setup a grid (Hadoop 0.17) having Linux ( RHEL5 / FC 9), Solaris (SunOS 5) and AIX (5.3). I was able to setup a grid with 10 Linux machines and run some basic grid jobs on it. I was also able to setup and start off a standalone grid in an AIX machine. But when I try to copy data into this (AIX) grid, I get the following error – *$ /opt/hadoop/bin/hadoop dfs -ls* *ls: Cannot access .: No such file or directory.* *$ /opt/hadoop/bin/hadoop dfs -copyFromLocal option_100_data.csv option_100_data.csv* *08/08/13 02:36:50 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org .apache .hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * *at org.apache.hadoop.dfs.NameNode.addBlock(NameNode.java: 300)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun .reflect .NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun .reflect .DelegatingMethodAccessorImpl .invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)* *at org.apache.hadoop.ipc.Server$Handler.run(Server.java: 896)* * * *at org.apache.hadoop.ipc.Client.call(Client.java:557)* *at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)* *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun .reflect .NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun .reflect .DelegatingMethodAccessorImpl .invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org .apache .hadoop .io .retry .RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82) * *at org .apache .hadoop .io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java: 59) * *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at org.apache.hadoop.dfs.DFSClient $DFSOutputStream.locateFollowingBlock(DFSClient.java:2334) * *at org.apache.hadoop.dfs.DFSClient $DFSOutputStream.nextBlockOutputStream(DFSClient.java:2219) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.access $1700(DFSClient.java:1702) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream $DataStreamer.run(DFSClient.java:1842) * * * *08/08/13 02:36:50 WARN dfs.DFSClient: NotReplicatedYetException sleeping /user/hadoop/option_100_data.csv retries left 4* *08/08/13 02:36:51 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org .apache .hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * * * ** * * *08/08/13 02:36:57 WARN dfs.DFSClient: Error Recovery for block null bad datanode[0]* *$* This is the only error I am seeing in the log files. My first doubt was if the issue was due to IBM JDK. To verify this I tried to run Hadoop using IBM JDK in Linux (FC 9) machine and it worked perfectly. It would be a great help if someone could give me some pointers on what I can try to solve / debug this error. Thanks, Arun -- View this message in context: http://www.nabble.com/issues-with-hadoop-in-AIX-tp18959680p21156899.html Sent from the Hadoop core-user mailing list archive at Nabble.com.
issues with hadoop in AIX
Hi, I am evaluating Hadoop's Portability Across Heterogeneous Hardware and Software Platforms. For this I am trying to setup a grid (Hadoop 0.17) having Linux ( RHEL5 / FC 9), Solaris (SunOS 5) and AIX (5.3). I was able to setup a grid with 10 Linux machines and run some basic grid jobs on it. I was also able to setup and start off a standalone grid in an AIX machine. But when I try to copy data into this (AIX) grid, I get the following error – *$ /opt/hadoop/bin/hadoop dfs -ls* *ls: Cannot access .: No such file or directory.* *$ /opt/hadoop/bin/hadoop dfs -copyFromLocal option_100_data.csv option_100_data.csv* *08/08/13 02:36:50 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org.apache.hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * *at org.apache.hadoop.dfs.NameNode.addBlock(NameNode.java:300)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:446)* *at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)* * * *at org.apache.hadoop.ipc.Client.call(Client.java:557)* *at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:212)* *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)* *at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64) * *at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) * *at java.lang.reflect.Method.invoke(Method.java:615)* *at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:82) * *at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59) * *at org.apache.hadoop.dfs.$Proxy0.addBlock(Unknown Source)* *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:2334) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2219) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.access$1700(DFSClient.java:1702) * *at org.apache.hadoop.dfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:1842) * * * *08/08/13 02:36:50 WARN dfs.DFSClient: NotReplicatedYetException sleeping /user/hadoop/option_100_data.csv retries left 4* *08/08/13 02:36:51 INFO dfs.DFSClient: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File /user/hadoop/option_100_data.csv could only be replicated to 0 nodes, instead of 1* *at org.apache.hadoop.dfs.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1145) * * * ** * * *08/08/13 02:36:57 WARN dfs.DFSClient: Error Recovery for block null bad datanode[0]* *$* This is the only error I am seeing in the log files. My first doubt was if the issue was due to IBM JDK. To verify this I tried to run Hadoop using IBM JDK in Linux (FC 9) machine and it worked perfectly. It would be a great help if someone could give me some pointers on what I can try to solve / debug this error. Thanks, Arun
