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I wonder what motivation they had for developing their own BigTable/Dynamo implementation rather than going with Cassandra or HBase.

Now there are three Apache projects with quite a bit of overlap (distributed columnar/key-value database). Hooray for fragmentation!

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HBase probably wasn't nearly as mature as Accumulo was when they were evaluating options, so starting from scratch might have been more attractive. It also seems to have some interesting access control features that I don't think are anywhere else, though thats not a killer feature for most people in the commercial world.

Security was mentioned in the article.

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