Hi Nithin & Ted, Thanks for the replies.
I don't know what my replication factor is, I don't seem to have set anything in my configuration files. I run on a single node cluster. My data node has gone down and came back, and also I didn't delete any of the hdfs blocks. I know that name node enter safe mode when HDFS is restarted, and will leave soon. Is it safe to execute command to leave safe mode? I mean, can something wrong happen if we do it ourselves? because it wouldn't have collected the needed data and could not leave the safe mode by itself? And, does the error I gave above indicate some clue as to what I could do better? Thanks, Kishore On Mon, May 6, 2013 at 2:56 PM, Ted Xu <t...@gopivotal.com> wrote: > Hi Kishore, > > It should not be a bug. After restarting HDFS, namenode will enter safe > mode until all needed data is collected. During safe mode, all update > operations will fail. > > In some cases, as Nitin mentioned, namenode will never leave safe mode > because it can't get enough data. In that case you may need to force name > node leave safe mode. > > For more information, see > http://hadoop.apache.org/docs/r2.0.4-alpha/hadoop-project-dist/hadoop-hdfs/HdfsUserGuide.html#Safemode > . > > > On Mon, May 6, 2013 at 5:00 PM, Nitin Pawar <nitinpawar...@gmail.com>wrote: > >> What is your replication factor on hdfs? >> Did any of your datanode go down recently and is not back in rotation? >> Did you delete any hdfs blocks directly from datanodes? >> On May 6, 2013 2:28 PM, "Krishna Kishore Bonagiri" < >> write2kish...@gmail.com> wrote: >> >>> Hi, >>> >>> I have been running application on my YARN cluster since around 20 >>> days, about 5000 applications a day. I am getting the following error >>> today. Please let me know how can I avoid this, is this happening because >>> of a bug? >>> >>> org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.hdfs.server.namenode.SafeModeException): >>> Cannot create file/1066/AppMaster.jar. Name node is in safe mode. >>> The reported blocks 4775 needs additional 880 blocks to reach the >>> threshold 0.9990 of total blocks 5660. Safe mode will be turned off >>> automatically. >>> at >>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1786) >>> at >>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInt(FSNamesystem.java:1737) >>> at >>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1719) >>> at >>> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.create(NameNodeRpcServer.java:429) >>> at >>> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.create(ClientNamenodeProtocolServerSideTranslatorPB.java:271) >>> at >>> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:40732) >>> at >>> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454) >>> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014) >>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741) >>> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737) >>> at java.security.AccessController.doPrivileged(Native Method) >>> at javax.security.auth.Subject.doAs(Subject.java:415) >>> at >>> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478) >>> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735) >>> >>> >>> Thanks, >>> Kishore >>> >> > > > -- > Regards, > Ted Xu >
