Luke Hebert
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Welcome to the articles section, where business, technology, and everyday problem-solving meet. You’ll find practical how-tos, troubleshooting notes from the trenches, and the occasional take on whatever’s happening in the world. Some posts will save you time, some will spark ideas, and a few will just be me thinking out loud. Grab a coffee and dig in.

Cleanup Alternatives June 27, 2017

Cleanup Alternatives

A quick procedure for resolving Cloudera Manager agent failures caused by corrupted system alternatives entries, including the exact commands to stop the agent, purge stale alternatives, and restart cleanly.
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CM License API Update June 27, 2017

CM License API Update

A quick reference for updating a Cloudera Manager license through the REST API using a single curl command, including the required headers and authentication.
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CM Timezone Does Not Match June 27, 2017

CM Timezone Does Not Match

Cloudera Manager raises a timezone mismatch alert when the OS clock files disagree with the timezone CM expects. This post walks through the three key files to check and how to align them.
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Compare KVNO in DB and in Keytab (These Should Match) June 27, 2017

Compare KVNO in DB and in Keytab (These Should Match)

A quick two-step check to confirm the Kerberos key version number in your KDC database matches the value stored in a local keytab file. Mismatched KVNO values are a common cause of authentication failures in Hadoop and other Kerberized services.
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Delete Hue Users June 27, 2017

Delete Hue Users

Hue does not provide a built-in UI option to remove user accounts. This workaround uses the Hue Django shell to delete one or more users directly from the database, with a clear caveat that the process is unsupported.
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Determine If a Datanode Is Dead (Formula) June 27, 2017

Determine If a Datanode Is Dead (Formula)

A quick reference for calculating the exact timeout window before Hadoop marks a Datanode as dead, based on the heartbeat and recheck-interval settings.
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