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From Michael Segel <michael_se...@hotmail.com>
Subject Re: Ruby shell versions for HBase 2.0
Date Wed, 13 May 2015 18:16:00 GMT

So if we move to a different tech, the modifications / customizations people have done are
going to be useless. 
If we upgrade to a new version of JRuby, some scripts may not have issues, others may have
some , and a third group would have major rewrites. 

The interesting / downside to JRuby is that within the entire eco system… no other use of

If you were going to switch… maybe Python? (Jython) 

> On May 13, 2015, at 12:37 PM, Sean Busbey <busbey@cloudera.com> wrote:
> On May 13, 2015 12:06 PM, "Michael Segel" <michael_segel@hotmail.com> wrote:
>> So…
>> Silly question…
>> Do you really need to worry about backward’s compatibility?
>> How many people have customized HBaseShell ?
>> What are the common customizations and if you port HBase shell, how much
> work would filter through to the custom code?
> These are excellent questions to which I have poor answers.

> The mechanics of the interactive repl via IRB will probably not be that
> different. However, the ref guide calls out the ability to customize things
> via hooking in your own ruby script so there's little bound on what we've
> set for expectations. Given ruby 1.8's age, I'm not even sure there are 1.8
> to 2.2 guides; likely folks would need to follow 1.8 to 1.9 and 1.9 to 2.2
> guides (or we could work to provide some combined guidance).
> Customizations are just as likely to be "call this sequence of commands"
> (little to no work for update) as a daemon that does health and recovery
> checks (lots of work, approaching "rewrite").
> Personally, I avoid customizations at least in part because it's ruby 1.8.
> I've also discouraged those who ask me. Instead I rely on the
> non-interactive flag and bash.  But given the ref guide positioning, it's
> likely we'll break a nontrivial number of folks.

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