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Questions tagged [rocksdb]

RocksDB is an embeddable persistent key-value store for fast storage. RocksDB can also be the foundation for a client-server database but our current focus is on embedded workloads.

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RocksDB is an embeddable persistent key-value store for fast storage. RocksDB can also be the foundation for a client-server database but our current focus is on embedded workloads.

RocksDB builds on LevelDB to be scalable to run on servers with many CPU cores, to efficiently use fast storage, to support IO-bound, in-memory and write-once workloads, and to be flexible to allow for innovation.

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Unable to use Flink RocksDB state backend due to endianness mismatch

My Flink Job reads from a kafka topic and store the data in a RocksDB state backend, in order to make use of the queryable state. I'm able to run the job and query the state in my local machine. But when deploying on the cluster, I'm getting the…
mmziyad
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Hyperledger Fabric Rocksdb Database, Retrieve and Modification

I am working around to figure out that Fabric v0.6 is really not allowed data modification illegally. Beside I want to modify data in "sst" format directly. I want to use some other such as create instance of database then retrieve all data ->…
Stev Jane
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RocksDB: support of out-of-core ? related performance?

I'm starting a new software that should be able to handle large dataset, ie, some terabytes of data. I have seen that Rocksdb allows storage of large datasets, but I'm not sure it is an out-of-core feature? I mean, if the dataset is larger than the…
CDZ
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Exception in thread "StreamThread-1" java.lang.UnsatisfiedLinkError. Cannot load module /tmp/librocksdbjni*.so

I have created one kafka streaming application. In that, I am trying to aggregate a KStream into KTable. There, i have specified one statestore which is used internally by Kafka. However, on running the application, I am getting below…
Manish Bansal
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Referencing RocksDB DLL in SBT

I am using RocksDB in a scala project with SBT. For windows I understand that I need to infor SBT about the win64 DLL which is inside the jar file, but am still not getting this right. I have tried what us written here but with no luck How to…
user7216174
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Why mmap-ing a file into the OS cache introduced performance bottlenecks for reads?

When I was reading the document of RocksDB, I saw that: We found that mmap-ing a file into the OS cache introduced performance bottlenecks for reads. I have two questions: What's the root cause of this performance? How to test for this case? I…
pengdu
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Using rocksdb::Iterator and Column Family is not working

I have the following piece of code: rocksdb::DBWithTTL* db = ... rocksdb::WriteOptions writeOptions; rocksdb::ColumnFamilyHandle cfHandle = ... std::string keyPrefix = "prefix"; std::string key = keyPrefix + "_key"; std::string value =…
Mugen
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Save RocksDB stored values between runs

My C++ app is using RocksDB to store in-memory key-value sets. At some points, I want my app to be able to keep the DB values until its next run. Meaning, the program will shut down, start again and read the same values from the DB as it had before…
Mugen
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Strange C++ error on Xcode and rocksdb

I am trying to use RocksDB on MacOS, with Xcode. I met a strange problem like below Xcode reported that ; is missing, but it is there. The code comes from rocksdb without any modification, so it is strange that there is an error. Update I enabled…
mommomonthewind
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Error when start mongoDB with --storageEngine options: "unrecognised option"

I tried to start mongod service with "--storageEngine=rocksdb" but I got error of ""unrecognised option" . I tried to see all the option variables by running help command and didn't see "--storageEngine" option for mongod. Below are all the option…
sumit jha
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NoSQL storage for a tracing system

I have a use case which includes a system that can trace data, to explain the case the system has to intercept each request and check if that request is already exist to do some map/reduce on the body, it suppose to be real time. I'm sorry that I…
AboElzooz
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RocksDB cryptic error message

Does anyone understand what this RocksDB error refers to ? /column_family.cc:275: rocksdb::ColumnFamilyData::~ColumnFamilyData(): Assertion `refs_ == 0' failed. Aborted (core dumped)
user1305541
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Cant compile rocksdb, dependencies not found

I am trying to compile a program that uses rocksdb. According to the example in the official webpage, the only header i should add to my code is db.h. Now, the file i am compiling is in folder A. db.h however is in…
user3013172
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RocksDb fails to create more than one database instance concurrently

I am writing a OpenMPI programm that creates a database instance for every processor, inserts some data, and closes the database when done. The program works well with one processor. starting more than one would cause a segmentation fault when a…
bafla
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Rocksdb make error

i want to test pyrocksdb follwoing these steps. After building the shared_lib and setting up pyrocksb (without major problems and strictly following the steps), i try to load rocksdb from python and get the following error: >>>import…
PlagTag
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