CDH 5.3.2 - Need to restart impala daemon from shell/script

0
votes

I am using CDH 5.3.2 cluster and have a requirement to be able to start/stop impala daemons from a script. The command mentioned in Cloudera Docs

sudo service impala-server start

works fine on my CDH 5.10 local VM but on CDH 5.3.2 cluster I get an error "impala-server: unrecognized service". On checking in /etc/init.d I see that no such service is listed either (while its listed in 5.10 version)

Then i tried to restart the service directly from impala bin directory

cd /usr/bin
./impalad stop

However running into below error now:

E0918 11:55:27.815739 12046 JniFrontend.java:622] FileSystem is file:///
W0918 11:55:27.817589 12046 JniFrontend.java:534] Cannot detect CDH version. Skipping Hadoop configuration checks
E0918 11:55:27.817620 12046 impala-server.cc:210] Unsupported file system. Impala only supports DistributedFileSystem but the configured filesystem is: LocalFileSystem.fs.defaultFS(file:///) might be set incorrectly
E0918 11:55:27.817631 12046 impala-server.cc:212] Aborting Impala Server startup due to improper configuration

I checked core-site.xml on Cloudera Manager and fs.defaultFS is correctly set so not sure where its picking the value from. Any pointers on how to go further on this?

1
shellimpala

1 Answers

1
votes

The init.d service packages to start Impala from the command line are meant to be used for CDH users who do NOT want to use Cloudera Manager. The right way to start and stop Impala on a Cloudera Manager cluster is to use the CM API:

https://cloudera.github.io/cm_api/apidocs/v17/index.html

The tutorial shows how to use the CM APIs but for your situation you probably need to do:

$ curl -X POST -u USER:PASSWORD \
'CM_URL//api/v1/clusters/CLUSTERNAME/services/IMPALA_SERVICE/commands/stop'

replacing USER, PASSWORD, CM_URL, CLUSTERNAME, IMPALA_SERVICE_NAME with the appropriate values. The curl command will return a command ID.

Then poll this API with the command ID to see that the start/stop operation completed.

$ curl -u USER:PASSWORD 'CM_URL//api/v1/commands/COMMAND_ID'

However, if you still want to use the init.d service packages then you'll need to install the impala-server package.