Name node is in safe mode Not able to leave

Question

root  bin hadoop fs -mkdir t mkdir  org apache hadoop hdfs server namenode SafeModeException  Cannot create directory  user root t  Name node is in safe mode   not able to create anything in hdfs I did root  bin hadoop fs -safemode leave  But showing safemode  Unknown command  what is the problem  Solution  http   unmeshasreeveni blogspot com 2014 04 name-node-is-in-safe-mode-how-to-leave html m 1

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Run the command below using the HDFS OS user to disable safe mode   sudo -u hdfs hadoop dfsadmin -safemode leave

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try this  it will work   sudo -u hdfs hdfs dfsadmin -safemode leave

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Try this   sudo -u hdfs hdfs dfsadmin -safemode leave   check status of safemode  sudo -u hdfs hdfs dfsadmin -safemode get   If it is still in safemode  then one of the reason would be not enough space in your node  you can check your node disk usage using    df -h   if root partition is full  delete files or add space in your root partition and retry first step

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safe mode on means  HDFS is in READ only mode  safe mode off means  HDFS is in Writeable and readable mode   In Hadoop 2 6 0  we can check the status of name node with help of the below commands   TO CHECK THE name node status    hdfs dfsadmin -safemode get   TO ENTER IN SAFE MODE     hdfs dfsadmin -safemode enter   TO LEAVE SAFE mode     hdfs dfsadmin -safemode leave

User · Answer

use below command to turn off the safe mode     hdfs dfsadmin -safemode leave

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The Command did not work for me but the following did  hdfs dfsadmin -safemode leave   I used the hdfs command instead of the hadoop command   Check out http   ask gopivotal com hc en-us articles 200933026-HDFS-goes-into-readonly-mode-and-errors-out-with-Name-node-is-in-safe-mode- link too

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Namenode enters into safemode when there is shortage of memory  As a result the HDFS becomes readable only  That means one can not create any additional directory or file in the HDFS  To come out of the safemode  the following command is used    hadoop dfsadmin -safemode leave   If you are using cloudera manager   go to  gt  gt Actions gt  gt Leave Safemode   But it doesn t always solve the problem  The complete solution lies in making some space in the memory  Use the following command to check your memory usage   free -m   If you are using cloudera  you can also check if the HDFS is showing some signs of bad health  It probably must be showing some memory issue related to the namenode  Allot more memory by following the options available  I am not sure what commands to use for the same if you are not using cloudera manager but there must be a way  Hope it helps

User · Answer

In order to forcefully let the namenode leave safemode  following command should be executed    bin hadoop dfsadmin -safemode leave   You are getting Unknown command error for your command as -safemode isn t a sub-command for hadoop fs  but it is of hadoop dfsadmin   Also after the above command  I would suggest you to once run hadoop fsck so that any inconsistencies crept in the hdfs might be sorted out   Update   Use hdfs command instead of hadoop command for newer distributions  The hadoop command is being deprecated   hdfs dfsadmin -safemode leave   hadoop dfsadmin has been deprecated and so is hadoop fs command  all hdfs related tasks are being moved to a separate command hdfs

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If you use Hadoop version 2 6 1 above  while the command works  it complains that its depreciated  I actually could not use the hadoop dfsadmin -safemode leave because I was running Hadoop in a Docker container and that command magically fails when run in the container  so what I did was this  I checked doc and found dfs safemode threshold pct in documentation that says      Specifies the percentage of blocks that should satisfy the minimal   replication requirement defined by dfs replication min  Values less   than or equal to 0 mean not to wait for any particular percentage of   blocks before exiting safemode  Values greater than 1 will make safe   mode permanent    so I changed the hdfs-site xml into the following  In older Hadoop versions  apparently you need to do it in hdfs-default xml    lt configuration gt       lt property gt           lt name gt dfs safemode threshold pct lt  name gt           lt value gt 0 lt  value gt       lt  property gt   lt  configuration gt

[hadoop] Name node is in safe mode. Not able to leave

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