By Aaron Cordova, Billie Rinaldi, Michael Wall
Wake up to hurry on Apache Accumulo, the versatile, high-performance key/value shop created by means of the nationwide safety organisation (NSA) and according to Google’s BigTable information garage approach. Written by way of former NSA crew participants, this entire educational and reference covers Accumulo structure, software improvement, desk layout, and cell-level security.
With transparent info on approach management, functionality tuning, and most sensible practices, this ebook is perfect for builders looking to write Accumulo purposes, directors charged with fitting and preserving Accumulo, and different pros attracted to what Accumulo has to provide. you will discover every little thing you should use the program fully.
Get a high-level creation to Accumulo’s structure and information model
Take a swift travel via unmarried- and multiple-node installations, facts ingest, and query
Learn easy methods to write Accumulo purposes for a number of use instances, in keeping with examples
Dive into Accumulo internals, together with info no longer on hand within the documentation
Get targeted info for fitting, administering, tuning, and measuring performance
Learn most sensible practices in keeping with profitable implementations within the field
Find solutions to universal questions that each new Accumulo person asks
Read or Download Accumulo: Application Development, Table Design, and Best Practices PDF
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Additional info for Accumulo: Application Development, Table Design, and Best Practices
X n ) , . . , A r ( x 1 , . . , x n ) are atoms, then if M is a generic term model, M |= s Proof: iff Ρ |= s . Straightforward. • So a positive query of the usual purely existential form is true in M iff it is a consequence of P. , if Ρ is P(0) P(s(x)), then the identity substitution is a correct answer to the query p(x) in any Herbrand model, but is not a correct answer substitution in the usual sense, for Vxp(x) is not a consequence of P. , such that M |= A i f f A is true in a l l t e r m m o d e l s of P .
So some rules are more incomplete than others. Shepherdson [1984, 1985] showed that there are maximal computation rules R m such that if a query succeeds with answer θ under any rule it does so under R m , and if it fails under any rule it fails under R m , but it is not clear whether there are any recursive maximal rules. A query such as —ι p(x) Λ q(y) which has a variable occurring in a negative literal which does not also occur in a positive literal cannot possibly succeed (although it can fail if q(y) fails) because there is no way —ip(x) can be grounded, and it cannot be eliminated until it is grounded.
A r ( c p . . , c n ) } would make P U S inconsistent hence cwa(P U S) inconsistent contrary to hypothesis. • The converse of Theorem 5 can be stated a little more strongly in that new function symbols as well as new constants may be added: THEOREM 6 If Ρ is a set of Horn clauses and S is any set of ground atoms (possibly involving new constants and function symbols) and P U S is consistent then cwa(P U S) is consistent relative to any extension of the Herbrand universe by new constants and function symbols.
Accumulo: Application Development, Table Design, and Best Practices by Aaron Cordova, Billie Rinaldi, Michael Wall