Unable to start Accumulo - accumulo

Question

I am unable to run accumulo after i upgraded the JDK to 8. I have changed the environment variables.
I am able to start hadoop with out any Issues and i can access the data node on http://localhost:50075 (I am running all on my local machine).
And this is what i am getting in the accumulo logs
Thread "gc" died Can't tell if Accumulo is initialized; can't read instance id at hdfs://localhost:9000/accumulo/instance_id.
Here is the console output from accumulo start script
/usr/local/accumulo-1.6.1/bin$ ./start-all.sh
Starting monitor on localhost
WARN : Max open files on localhost is 1024, recommend 32768
Starting tablet servers .... done
Starting tablet server on localhost
WARN : Max open files on localhost is 1024, recommend 32768
2016-07-09 21:06:09,723 [fs.VolumeManagerImpl] WARN : dfs.datanode.synconclose set to false in hdfs-site.xml: data loss is possible on system reset or power loss
2016-07-09 21:06:09,726 [server.Accumulo] INFO : Attempting to talk to zookeeper
2016-07-09 21:06:09,844 [server.Accumulo] INFO : Zookeeper connected and initialized, attemping to talk to HDFS
2016-07-09 21:06:09,915 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:06:09,915 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 1.0 seconds
2016-07-09 21:06:10,917 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:06:10,917 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 2.0 seconds
2016-07-09 21:06:12,918 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:06:12,918 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 4.0 seconds
2016-07-09 21:06:16,919 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:06:16,919 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 8.0 seconds
2016-07-09 21:06:24,920 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:06:24,921 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 16.0 seconds
2016-07-09 21:06:40,923 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:06:40,923 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 32.0 seconds
2016-07-09 21:07:12,926 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:07:12,926 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds
2016-07-09 21:08:12,929 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:08:12,929 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds
2016-07-09 21:09:12,932 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:09:12,932 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds
2016-07-09 21:10:12,935 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:10:12,935 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds
2016-07-09 21:11:12,938 [server.Accumulo] WARN : Waiting for the NameNode to leave safemode
2016-07-09 21:11:12,938 [server.Accumulo] INFO : Backing off due to failure; current sleep period is 60.0 seconds
Not sure what i am doing wrong..Appreciate any help.
Thanks

Answer 1

The error message is telling you that the NameNode is in SafeMode. This is often because HDFS is aware that it is missing blocks to back the files that you had stored in HDFS on your local filesystem. Visit the NameNode UI at http://localhost:50070 for more reasons as to why the NameNode will not automatically leave safemode.
After you get the NameNode out of safe mode, verify that you still have the directory /accumulo in HDFS (e.g. hdfs dfs -ls /accumulo).
This directory (and the beneath structure) is created by running accumulo init. If that directory is not present, that means you deleted that HDFS directory (intentionally or not).
Make sure that you have HDFS configured to write to a directory which is not wiped on restart of your machine (e.g. avoid /tmp).