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Azure Cosmos DB session consistency: ordering outside of a session and consistent prefix guarantees
https://learn.microsoft.com/en-us/azure/cosmos-db/consistency-levels#session-consistency
The Cosmos DB documentation example on session consistency states:
Whereas the "Australia East" ...
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HBase consistency model(within the same cluster)
Background :
HBase reads seem to fall under the 'strong consistency' model, as : All reads are served from the master where the data has already been committed. As a result, the clients seem to always ...
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166
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Does CosmosDB throttle write requests for multi-region account using Session Consistency when read region lags behind?
In Cosmosdb's documentation here: https://learn.microsoft.com/en-us/azure/cosmos-db/consistency-levels#bounded-staleness-consistency it says that:
Bounded Staleness is beneficial primarily to single-...
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75
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Scrapy: Preventing Data Persistence and Cross-Request Contamination
Intro
I've edited the post to simplify and clarify the content and included the proposed solutions.
All issues were resolved using download delays and dupefilter (as suggested by @wRAR).
However, with ...
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Oracle Flashback queries for massively-parallel scanning of a large distributed table
I'd like to perform a massive parallel scanning of a large table in a clustered Oracle database setup (with a master node and several replicas). All client transactions that read from the table need ...
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How to arrange Spring Batch chunk processing with online transactions
The system has simultaneous batch jobs and online workflows. Consider batch job retrieving unprocessed documents, marking them as processed in the chunk transaction. Chunk processing is required for ...
1
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1
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38
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Ensuring Reliable Recovery of Missed Redis Sorted Sets in Event of Consumer App Downtime
I have a system with two applications:
infraApp: Writes data to Redis every 2 minutes using sortedSet. Each sortedSet key is based on the current date and time in the format yyyy-MM-dd-HH:MM, for ...
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89
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When a Raft leader with uncommitted changes is going to make the commit?
I was playing with https://raft.github.io/ with this situation, but have a big doubt about what is going on.
After a leader is elected, I make a request to it.
The leader send the append entry with ...
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1
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39
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What will happen if the processor perform a read operation while the cache line is still in the store buffer of another processor
Under the context of MESI protocol and the introducing of store buffer and invalidation queue, a write operation to a variable can be temporarily stored in the store buffer waiting for the related ...
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134
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How to Optimize Cache Line Read Access with Minimal Writer Cache Impact on x86?
I'm working with an x86 processor and need to read data that resides in another processor's cache line. I am coding in C++. The data is initially in an Exclusive (E) or Modified (M) state in the owner’...
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1
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1
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83
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support for strong consistency in memgraph
Does memgraph's Java client support strong consistency? I know that neo4j supports a variation called bookmarks. Does memgraph also support this? I looked at the memgraph documentation and could not ...
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2
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94
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QUORUM reads fail when one of two DCs are down
We have 2 DCs with RF=3 in this cluster: DC1 3 nodes DC2 3 nodes
The customer has requested that when DC2 goes down (all 3 nodes down), they want to keep the cluster working without any quorum issues.
...
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3
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882
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Can Sloppy Quorum guarantee strong read consistency?
In the book "Designing Data-Intensive Applications. The Big Ideas Behind Reliable, Scalable and Maintainable Systems", we can read regarding Sloppy Quorum :
However, this means that even ...
1
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1
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300
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OpenCL 1.2: Global memory consistency surrounding atomic operations?
I'm trying to implement global synchronization in OpenCL 1.2 using atomics and was wondering if there's any way to ensure that reads from different work groups (that provably -- by the logic of the ...
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164
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Transactional consistency in Delta lake
Does delta lake provide transactional level consistency? I know delta lake provide optimistic concurrency control for 2 concurrent operation, but I am talking about two concurrent transaction, not ...