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Your cluster’s operation can hiccup because of any of a myriad set of reasons from bugs in HBase itself through misconfigurations — misconfiguration of HBase but also operating system misconfigurations — through to hardware problems whether it be a bug in your network card drivers or an underprovisioned RAM bus (to mention two recent examples of hardware issues that manifested as "HBase is slow").You will also need to do a recalibration if up to this your computing has been bound to a single box.You must be able to connect to all nodes via SSH, including the local node, from the Master as well as any backup Master, using a shared key rather than a password.You can see the basic methodology for such a set-up in Linux or Unix systems at "Procedure: Configure Passwordless SSH Access".Run If this is your first foray into the wonderful world of Distributed Computing, then you are in for some interesting times.First off, distributed systems are hard; making a distributed system hum requires a disparate skillset that spans systems (hardware and software) and networking.Dynamic configuration is an exception to this, to be described later below.
Ubuntu and some other distributions default to 127.0.1.1 and this will cause problems for you. for detail After working your way through quickstart standalone mode, you can re-configure HBase to run in pseudo-distributed mode.
If you think this designation should be reconsidered for a given feature or use pattern, file a JIRA or start a discussion on one of the mailing lists.
In the context of Apache HBase, /not tested/ means that a feature or use pattern may or may not work in a given way, and may or may not corrupt your data or cause operational issues. If you can provide proof that a feature designated as /not tested/ does work in a given way, please submit the tests and/or the metrics so that other users can gain certainty about such features or use patterns.
Instead, send your report to the mailing list [email protected], which allows anyone to send messages, but restricts who can read them.
Someone on that list will contact you to follow up on your report.
Please read this chapter carefully, especially the Basic Prerequisites to ensure that your HBase testing and deployment goes smoothly, and prevent data loss.