data-integrity

As the data in the Commitlog is flushed to the disk periodically after every 10 seconds (controlled by commitlog_sync_period_in_ms ), so if all replicas crash within 10 seconds, will I lose all that data? Does it mean that, theoretically, a Cassandra Cluster can lose data? If a node crashed right before updating the commit log on disk, then yes, you could lose up to ten seconds of data. If you keep multiple replicas, by using a replication factor higher than 1 or have multiple data centers, then much of the lost data would be on other nodes, and would be recovered on the crashed node when it

I want to apply web service security according to OWASP Web Service Security . Thereby I stumbled over the two points: Message Integrity Message Confidentiality So far there is just a RESTful service which can be directly accessed by a client. For each request the client needs to authenticate by the server. All communication is secured via TLS. I'm now unsure about Message Integrity since I don't understand the sentence: When using public key cryptography, encryption does guarantee confidentiality but it does not guarantee integrity since the receiver's public key is public. For the same

I was trying out the validity of private access specifier in C++. Here goes: Interface: // class_A.h class A { public: void printX(); private: void actualPrintX(); int x; }; Implementation: // class_A.cpp void A::printX() { actualPrintX(); } void A::actualPrintX() { std::cout << x: } I built this in to a static library (.a/.lib). We now have a class_A.h and classA.a (or classA.lib) pair. I edited class_A.h and removed the private: from it. Now in another classTester.cpp: #include "class_A.h" // the newly edited header int main() { A a; a.x = 12; // both G++ and VC++ allowed this! a.printX(); /

I just want to check really quickly. Say I have two entities in a data model: Catalog, and Product. They have a many-to-many relationship with each other, and both are required (a Catalog must have at least one Product, and all Products must each belong to at least one Catalog). So if I was to delete a Product, its deletion should be Nullify, of course. But what should the deletion policy be for Catalog? If a Catalog is deleted, not all of its Products necessarily exclusively belong to it. A Product may belong to more than one Catalog. So I definitely shouldn't use Cascade. However, is Nullify