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HBase >> mail # user >> Insert into tall table 50% faster than wide table


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Re: Insert into tall table 50% faster than wide table
Actually I don't think this is the problem as HBase versions cells, not rows, if I understand correctly.

On Dec 22, 2010, at 5:03 PM, Bryan Keller wrote:

> Perhaps slow wide table insert performance is related to row versioning? If I have a customer row and keep adding order columns one by one, I'm thinking that there might be a version kept of the row for every order I add? If I am simply inserting a new row for every order, there is no versioning going on. Could this be causing performance problems?
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> On Dec 22, 2010, at 4:16 PM, Bryan Keller wrote:
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>> It appears to be the same or better, not to derail my original question. The much slower write performance will cause problems for me unless I can resolve that.
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>> On Dec 22, 2010, at 3:52 PM, Peter Haidinyak wrote:
>>
>>> Interesting, do you know what the time difference would be on the other side, doing a lookup/scan?
>>>
>>> Thanks
>>>
>>> -Pete
>>>
>>> -----Original Message-----
>>> From: Bryan Keller [mailto:[EMAIL PROTECTED]]
>>> Sent: Wednesday, December 22, 2010 3:41 PM
>>> To: [EMAIL PROTECTED]
>>> Subject: Insert into tall table 50% faster than wide table
>>>
>>> I have been testing a couple of different approaches to storing customer orders. One is a tall table, where each order is a row. The other is a wide table where each customer is a row, and orders are columns in the row. I am finding that inserts into the tall table, i.e. adding rows for every order, is roughly 50% faster than inserts into the wide table, i.e. adding a row for a customer and then adding columns for orders.
>>>
>>> In my test, there are 10,000 customers, each customer has 600 orders and each order has 10 columns. The tall table approach results in 6 mil rows of 10 columns. The wide table approach results is 10,000 rows of 6,000 columns. I'm using hbase 0.89-20100924 and hadoop 0.20.2. I am adding the orders using a Put for each order, submitted in batches of 1000 as a list of Puts.
>>>
>>> Are there techniques to speed up inserts with the wide table approach that I am perhaps overlooking?
>>>
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