About aervits

aervits · ‎06-17-2016

It upgrades one namenode at a time not both. Kerberos can stay on.

aervits · ‎06-17-2016

I reviewed the documentation for Ambari 2.2.2.0 and do not see requirement to turn off Kerberos during rolling upgrade. It also does not say whether both namenodes are down at any point in time. Can someone confirm with 100% surety that there is no point in time where both namenodes are down and hdfs is unaccessible? I also need confirmation that in the latest Ambari it is no longer necessary to turn off Kerberos to perform rolling upgrade.

aervits · ‎06-17-2016

@Alexander Feldman please see this thread as question has been asked before https://community.hortonworks.com/questions/9033/how-to-add-custom-alerts-in-ambari.html

aervits · ‎06-17-2016

I'm looking for general guidelines and best practices from the field on the following two properties in hdfs-site.xml. I am looking for more than description derived from hdfs-default.xml. What are people seeing and what are some of the production values for the two configuration properties? dfs.datanode.available-space-volume-choosing-policy.balanced-space-threshold dfs.datanode.available-space-volume-choosing-policy.balanced-space-preference-fraction

aervits · ‎06-16-2016

You will do this on the edge node, that's what it's for, to interact with Hadoop through client tools.

aervits · ‎06-16-2016

@Chris Nauroth thank you very much, looking forward to your Hadoop Summit sessions.

aervits · ‎06-11-2016

Why is there a forward slash in jdbc string?

aervits · ‎06-10-2016

It still says bad substitution, you check the /var/log/Hadoop, specifically yarn and mapreduce logs

aervits · ‎06-10-2016

@Steve Steyic first of all awesome catch! Secondly, I checked with engineering, this is a problem with documentation rather than with packaging. HDP 2.3.x suppose to contain DataFu 1.2. 1.3 is coming in next HDP release. You actually got to the bottom of something that I was researching myself but never dug deeper. Again thank you for bringing this to our attention.

aervits · ‎06-10-2016

You don't necessarily need to remove Kafka service but to clean up topics use the following approach https://community.hortonworks.com/questions/1786/how-to-clean-up-purge-kafka-queues.html

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