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Re: HBASE - select distinct query against the rowkey - HBase - [mail # user]
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...There is no concept of transaction in the NoSQL world. At least not in HBase. All writes are atomic. Note that you *could* hold a lock, however, not really a good idea for a clie...
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Author: Michael Segel,
2012-12-20, 16:48
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Re: HBASE - select distinct query against the rowkey - HBase - [mail # user]
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...Not sure why you have timestamp in the key... assuming that message id would be incremented therefore rows would be in time order anyways. But to answer your question... You wil...
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Author: Michael Segel,
2012-12-20, 15:59
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Re: Is it necessary to set MD5 on rowkey? - HBase - [mail # user]
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...Lars, Ok... he's talking about buckets. So when you have N buckets, what is the least number of get()s do you need to fetch the single row? (Hint: The answer is N) Ho...
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Author: Michael Segel,
2012-12-20, 13:20
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Re: Many scanner opening - HBase - [mail # user]
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...I'd suggest looking in to a schema design change. On Dec 18, 2012, at 2:01 AM, Eugeny Morozov wrote: ...
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Author: Michael Segel,
2012-12-20, 13:14
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Re: Is it necessary to set MD5 on rowkey? - HBase - [mail # user]
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...Ok, Lets try this one more time... If you salt, you will have to do a *FULL* *TABLE* *SCAN* in order to retrieve the row. If you do something like a salt that uses only &...
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Author: Michael Segel,
2012-12-20, 01:23
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Re: recommended nodes - HBase - [mail # user]
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...Yeah, I couldn't argue against LVMs when talking with the system admins. In terms of speed its noise because the CPUs are pretty efficient and unless you have more than 1 drive p...
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Author: Michael Segel,
2012-12-20, 01:14
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Re: Is it necessary to set MD5 on rowkey? - HBase - [mail # user]
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...And there's the rub. Hashing is one thing. Salting is another. Hashing good. Salting bad. That simple. BTW, truncating the hash and appending the key falls in to ha...
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Author: Michael Segel,
2012-12-20, 01:09
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Re: Is it necessary to set MD5 on rowkey? - HBase - [mail # user]
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...Ok... So you use a random byte or two at the front of the row. How do you then use get() to find the row? How do you do a partial scan()? Do you start to see the problem? ...
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Author: Michael Segel,
2012-12-20, 01:02
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Re: Customizing hbase shell's table formatting - HBase - [mail # user]
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...Well the shell is written in JRuby which is pretty much Ruby. That's the best way to enhance the shell. On Dec 19, 2012, at 2:56 PM, Adam Phelps wrote: ...
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Author: Michael Segel,
2012-12-19, 21:04
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Re: Is it necessary to set MD5 on rowkey? - HBase - [mail # user]
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...I think you missed the point. You seem to think that salting is ok. I want you to walk through an example so that we can discuss it. ;-) On Dec 19, 2012, at 2:51 PM, lars ...
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Author: Michael Segel,
2012-12-19, 21:02
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