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Re: Compactions nice to have features - HBase - [mail # dev]
...On Oct 5, 2014, at 11:01 PM, lars hofhansl  wrote:Hmmm. Rough math…  using 3.5” SATA II (7200 RPM) drives … 4 drives would max out 1GbE.  So then  a server with 12 drives...
   Author: Michael Segel, 2014-10-08, 19:31
Re: A use case for ttl deletion? - HBase - [mail # user]
...OP wants to know good use cases where to use ttl setting. Answer: Any situation where the cost of retaining the data exceeds the value to be gained from the data.  Using ttl allows for ...
   Author: Michael Segel, 2014-09-30, 13:16
Re: Adding 64-bit nodes to 32-bit cluster? - HBase - [mail # user]
...You need to create two sets of Hadoop configurations and deploy them to the correct nodes. Yarn was supposed to be the way to heterogenous clusters. But this begs the question. Why on earth ...
   Author: Michael Segel, 2014-09-19, 12:30
[expand - 2 more] - Re: HBase reads, isolation levels and RegionScanner internal locking - HBase - [mail # dev]
...Atomic is atomic and that’s not an issue. But if you’re locking a row… what are you locking? The HFiles that make up the row? The CFs? The memory? How long do you hold the lock(s)? On Sep 12...
   Author: Michael Segel, 2014-09-13, 19:54
[expand - 3 more] - Re: Scan vs Parallel scan. - HBase - [mail # user]
...It doesn’t matter which RS, but that you have 1 thread for each region. So for each thread, what’s happening. Step by step, what is the code doing. Now you’re comparing this against a single...
   Author: Michael Segel, 2014-09-12, 13:24
[expand - 4 more] - Re: Nested data structures examples for HBase - HBase - [mail # user]
...@Wilm, Let me put it a different way… Think of a sales invoice. You can have columns for invoice_id, customer_id, customer_name, customer_billing_address (Nested structure), customer_contact...
   Author: Michael Segel, 2014-09-12, 07:23
[expand - 2 more] - Re: One-table w/ multi-CF or multi-table w/ one-CF? - HBase - [mail # user]
...Locality? Then the data should be in the same column family.  That’s as local as you can get. I would suggest that you think of the following:What’s the predominant use case? How are yo...
   Author: Michael Segel, 2014-09-09, 21:02
[expand - 1 more] - Re: HBase - Performance issue - HBase - [mail # user]
...So you have large RS and you have large regions. Your regions are huge relative to your RS memory heap. (Not ideal.) You have slow drives (5400rpm) and you have 1GbE network. Do didn’t say h...
   Author: Michael Segel, 2014-09-09, 20:45
[expand - 3 more] - Re: Silly question... Coprocessor writes to ZK? - HBase - [mail # user]
...@RyanHmmm. Interesting. Lets take a step back for a second.Which do you prefer: A push model or a pull/poll  model?That would kind of dictate the decisions you would make in terms of de...
   Author: Michael Segel, 2014-09-05, 19:56
Re: Question on the number of column families - HBase - [mail # user]
...I think you need to go back a bit further from the problem and ask yourself when would you want to have the same row key used for disjoint data. That is data that refers to the same object, ...
   Author: Michael Segel, 2014-08-05, 21:55
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