leveldb | LevelDB for Ruby | Key Value Database library
kandi X-RAY | leveldb Summary
kandi X-RAY | leveldb Summary
LevelDB is a database library (C++, 350 kB) written at Google. It is an embedded database. LevelDB is a persistent ordered map. LevelDB stores keys and values in arbitrary byte arrays, and data is sorted by key. It supports batching writes, forward and backward iteration, and compression of the data via Google's Snappy compression library. Still, LevelDB is not a SQL database. (Wikipedia).
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Top functions reviewed by kandi - BETA
- Create a new object .
- Initializes a new batch .
- Close the database .
- Get the value from the database .
- Fetch value by default
- Move the next iterator to the next index .
- Move the next item to the next loop .
- Called when the error occurs .
- Read from the input stream .
- Reverse the first operation .
leveldb Key Features
leveldb Examples and Code Snippets
Community Discussions
Trending Discussions on leveldb
QUESTION
I'm trying to generate hyperledger channel, when i run it on local works without problems, but when i run on AWS ec2, i ve problems, there its my problem:
...ANSWER
Answered 2021-Jun-07 at 16:20Low memory on machine, that was problem
QUESTION
When a Hyperledger Fabric smart contract calls getHistoryForKey it receive the updates for a particular key. I'm wondering where does this information come from? It's not stored in the world-view (levelDB, CouchDB) so it must be retrieved from the blockchain. Does the smart contract has access to blockchain? What am I missing?
...ANSWER
Answered 2021-Jun-01 at 16:24There is a setting which enables the history database for peers. It is enabled by default and is a a physically separate database from world state.
Each channel has it's own history database. The history database uses LevelDB (an embedded database) for storage.
The history database stores key/txid/blocknum for each update. When you call GetHistoryForKey, it iterates through the history db and then retrieves the values from block storage.
QUESTION
Here's the situation: I have a Firestore Database. I download it on a daily basis to a Google Cloud Storage Bucket as a backup. If I want to download it locally, I do it using this command gsutil -m cp -r gs://BUCKET_PATH "DESTINATION_PATH"
and it works fine.
MY PROBLEM: the format of the Bucket I download is LevelDB (I think). On my machine, it looks like this :
For example, this is my /users
collection in Firestore when I download it through Google Storage. In the folder, I have multiple binary files ("output-...") and a file ( here: "all_namespaces_kind_users") for metadata.
MY GOAL: I want to be able to read my database in a json file.
MY TRIES:
- I try to use this convertor : https://github.com/Venryx/firestore-leveldb-tools but it uses Python2 and some old google libraries. Using this convertor, I have to download the SDKs locally (see below).
ANSWER
Answered 2021-Apr-26 at 22:53I have created a converter in Python 3 which could convert firestore export files into JSON files firestore-export-json. The package provides a simple CLI command to covert the file.
QUESTION
Received an import error after upgrading to airflow2.0.2-python3.7 image. Package seems to be installed, not sure what is causing the issue and how to fix it. Tried to uninstalling and reinstalling the packages but that does not work either.
...ANSWER
Answered 2021-Apr-22 at 12:15It's a bug (harmless) in definition of the google provider 2.2.0 in fact:
In provider.yaml
:
airflow.providers.google.common.hooks.leveldb.LevelDBHook
should be:
airflow.providers.google.leveldb.hooks.LevelDBHook
This was fixed in https://github.com/apache/airflow/pull/15453 and will be available in next version of google provider.
QUESTION
I just started to learn level.db using the level module in node.js
...ANSWER
Answered 2021-Apr-17 at 15:11From the GitHub page of leveldb here, we can see an example :
QUESTION
A friend of mine contacted me with a problem he has been having with Discord. Windows asks what program the code below should be run with and the default is Discord. Every time Discord is run, this chunk of code is run:
...ANSWER
Answered 2021-Feb-18 at 04:13that is malware, not only a token logger but also stealing Chrome, Brave, Opera and Yandex passwords. uninstall that immediately and change all your passwords
yt channel of creator: https://www.youtube.com/channel/UCydMtuzGQ0kFPhK2hIXFf6A
update: ap it turns out, it also steals your ip, yay!
QUESTION
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ld: warning: dylib (/Users/Shared/store/build/ios/Release-iphoneos/abseil/absl.framework/absl) was built for newer iOS version (11.0) than being linked (10.0)
ld: warning: dylib (/Users/Shared/store/build/ios/Release-iphoneos/gRPC-C++/grpcpp.framework/grpcpp) was built for newer iOS version (11.0) than being linked (10.0)
ld: warning: dylib (/Users/Shared/store/build/ios/Release-iphoneos/leveldb-library/leveldb.framework/leveldb) was built for newer iOS version (11.0) than being linked (10.0)
note: Using new build system
note: Building targets in parallel
note: Planning build
note: Constructing build description
Encountered error while building for device.
...ANSWER
Answered 2021-Apr-03 at 06:00Run flutter upgrade
to upgrade to most recent version of Flutter. After that, flutter clean
and build again. This should solve your problem.
QUESTION
https://www.devprovider.com/how-to-take-backup-from-hyperledger-fabric/
https://www.devprovider.com/how-to-restore-hyperledger-fabric-from-backup/
I follow this 2 tutorials for back up and restore my Blockchain,I did everything the same except:
Make back up:
1:
...ANSWER
Answered 2021-Mar-31 at 07:13according to your describe,in the tourial ,fabric version is v1.4.X,and the fabric you now use is v2.x.x,so in v1.4.x the test script is byfn.sh and in v2.x.x the test script is network.sh,these two scripts are different.
if you want to backup a fabric network and restore,you need just backup crypto-config(organizations in v2.x.x),ledger data which obtain from /var/hyperledger/fabric of docker container,and start your orderer and peer container ,you need not create channel or join channel ,you can query and invoke chaincode.
I have answer another question about restore fabric network,you can reference it In Hyperledger Fabric, is there a way to reuse the data of previous network?
--------------new answer-------------------------------
if you exec you peer chaincode invoke
command in terminal,you should add this env,and you can invoke success.
QUESTION
I was trying to test out the endorsement policy feature of Fabric with the Running a Fabric Application tutorial and I have encountered a few questions/issues.
Instead of using LevelDB, I up the network using CouchDB by changing the command to ./network.sh up createChannel -c mychannel -ca -s couchdb
.
After the call to InitLedger
, I manually edit asset2's "Size"
field value to another random value through fauxton, accessed from http://127.0.0.1:5984/_utils/ (couchdb0, which belongs to organization 1). So at this point, asset2 has 2 different value sitting in couchdb0 and couchdb1.
Then I invoke the UpdateAsset
function in the chaincode to update asset2's value. I was expecting an error about endorsement policy is not met or something to be thrown as the different value of asset2 in couchdb0 and couchdb1 should results in different RW set.
ANSWER
Answered 2021-Mar-25 at 14:48This is working as expected. You updated the size field but not the version field. The read set check only checks the version field. It is up to the chaincode to check other fields such as asset ownership (and size, if there are business rules around that, such as size not being allowed to change in an update). The asset transfer chaincode is a trivial sample and only checks for asset existence in state database by key. So in your case chaincode execution succeeded because it passed the asset existence check, endorsements succeeded, and validation succeeded since both endorsements were over the same read set (version) and write set.
You get the CouchDB warning because the internal CouchDB revision number was different due to your external update, but this is not a fatal problem and gets resolved by a retry (CouchDB internal revision numbers are not guaranteed to be the same across state databases since peer may update the same state multiple times, e.g. in crash recovery scenarios).
QUESTION
I've been dealing with many problems for a few days. I updated the places I need to update in the pod file. I tried too mant methods to fix my errors. I try to delete my podfile update my podfile, i tried to pod update Firebase/Firestore.
Then i tried to this method to run my app : Run this commands
...ANSWER
Answered 2021-Feb-05 at 11:15I faced the same issue, except my iOS deployment target was set to 9.
Navigate to the folder when you have your Runner XCode project.
Run this command
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Install leveldb
On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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