Cloudera Docs

Check trace table

After you have added the Accumulo on CDP service as a part of the Accumulo installation, you have to check whether the trace table, that records the time span of operations, exists.

Accumulo records the time that various operations take when tracing is turned on. It follows all the requests made on behalf of the user throughout the distributed infrastructure of Accumulo, and across all threads of execution.

These timespans are inserted into the trace table in Accumulo. You can browse recent traces from the Accumulo monitor page. You can also read the trace table directly like any other table.

  • Install the Accumulo CSD file.
  • Install CDP and add the HDFS and ZooKeeper services to your deployment.
  • Install the Accumulo parcel.
  • Add the Accumulo on CDP service to your deployment.
  1. Launch the Accumulo shell for the admin user.
    • Unsecure Accumulo
      $ accumulo shell -u root
Password: ******
Shell - Apache Accumulo Interactive Shell
-
- version: [***ACCUMULO VERSION NUMBER***]
- instance name: [***ACCUMULO INSTANCE NAME***]
- instance id: [***ACCUMULO INSTANCE ID***]
-
- type 'help' for a list of available commands
-
root@accumulo>
    • Secure Accumulo
      kinit -kt /var/run/cloudera-scm-agent/process/[***TIMESTAMP***]-[***SERVICE NAME***]-[***INSTANCE NAME***]/accumulo_on_cdp.keytab accumulo/$[***HOSTNAME***]
accumulo shell
Shell - Apache Accumulo Interactive Shell
-
- version: [***ACCUMULO VERSION NUMBER***]
- instance name: [***ACCUMULO INSTANCE NAME***]
- instance id: [***ACCUMULO INSTANCE ID***]
-
- type 'help' for a list of available commands
-
accumulo/hostname@REALM.COM@accumulo>
  2. List tables and check if the trace table exists. 
    > tables
accumulo.metadata
accumulo.replication
accumulo.root
trace
>
  3. If the trace table does not exist, create it with the following command: createtable trace.
Provide user permissions.