Gossip | Java实现的Gossip协议,借鉴CassandraV1.1.1源码 | Pub Sub library

 by   dongjinyong Java Version: Current License: No License

kandi X-RAY | Gossip Summary

kandi X-RAY | Gossip Summary

Gossip is a Java library typically used in Messaging, Pub Sub applications. Gossip has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

Java实现的Gossip协议,基于CassandraV1.1.1源码修改实现(尽量保留了Cassandra源码),把Cassandra中Gossip协议相关部分抽取了出来,供大家参考。 目录结构与cassandra源码一致,以下为目录说明: concurrent:并发包工具类. config:配置信息. gms:gossip的核心实现类. io:序列化相关. locator:事件监听器和seed接口. net:通信相关,采用传统的BIO方式,可根据项目需要换成自己的通信服务层. service:供外部调用的方法,gossip协议使用方法实例程序. utils:工具类. 对Cassandra源码的修改主要包括: 1. InetAddress换成InetSocketAddress,可以为每个实例指定不同的端口,方便本机启用多个实例调试。 2. 去掉了与cassandra业务耦合的一些类和方法,对监听器接口做了简化。 3. 简化通信部分,如果项目需要,或者有独立的通信服务代码,直接替换net目录下的类或接口即可。.

            kandi-support Support

              Gossip has a low active ecosystem.
              It has 31 star(s) with 24 fork(s). There are 5 watchers for this library.
              It had no major release in the last 6 months.
              Gossip has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of Gossip is current.

            kandi-Quality Quality

              Gossip has 0 bugs and 0 code smells.

            kandi-Security Security

              Gossip has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              Gossip code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              Gossip does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              Gossip releases are not available. You will need to build from source code and install.
              Build file is available. You can build the component from source.
              Gossip saves you 1699 person hours of effort in developing the same functionality from scratch.
              It has 3765 lines of code, 374 functions and 57 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed Gossip and discovered the below as its top functions. This is intended to give you an instant insight into Gossip implemented functionality, and help decide if they suit your requirements.
            • Do a verbose message
            • Creates a GossipDigestAck message
            • Method used to parse Gossiper s state
            • Sort the list of endpoints
            • Handles verification of a message
            • Update failure detector
            • Applies the gossip state locally to the given state
            • Send a message to a specific endpoint
            • Start the Goss service
            • Starts a new connection
            • Do the gossip
            • Report the arrival samples
            • Dump inter arrival times
            • Sends a gossip message to the peer
            • Returns a string representation of the endpoint
            • Add an endpoint as saved
            • Called when a token is removed
            • Serialize the given EndpointState object
            • Generate a random gossip digest
            • Reads len bytes from the stream
            • Processes the gossip message
            • Send an endpoint to the cluster
            • Process a GossipAckA message
            • Deserialize the endpoint state
            • Do status check
            • Intercept the arrival window
            Get all kandi verified functions for this library.

            Gossip Key Features

            No Key Features are available at this moment for Gossip.

            Gossip Examples and Code Snippets

            No Code Snippets are available at this moment for Gossip.

            Community Discussions


            Upgraded Cassandra 3.11 to 4.0, failed with "node with address ... already exists"
            Asked 2022-Mar-07 at 00:15

            we try to upgrade apache cassandra 3.11.12 to 4.0.2, this is the first node we upgrade in this cluster (seed node). we drain the node and stop the service before replace the version.

            system log:



            Answered 2022-Mar-07 at 00:15

            During startup, Cassandra tries to retrieve the host ID by querying the local system table with:

            Source https://stackoverflow.com/questions/71343502


            Mongo vs cassandra: single point of failure
            Asked 2022-Mar-02 at 08:10

            In Cassandra vs Mongo debate, it is said that as mongo has master-slave architecture so it has a single point of failure(master) as when master fails, slave nodes take time to decide for new master, hence a window for downtime.

            With Cassandra we don't have this problem as all nodes are equal. But then Cassandra too has a system wherein nodes use gossip protocol to keep themselves updated. In gossip protocol a minimum number of nodes are needed to take part. Suppose if one of the participating node goes down, then a new node needs to replace it. But it would take time to spawn a new replacement node, and this is a situation similar to master failure in mongo.

            So what's the difference between 2 as far as single point of failure is concerned?



            Answered 2022-Mar-02 at 07:11

            Your assumptions about Cassandra are not correct so allow me to explain.

            Gossip does not require multiple nodes for it to work. It is possible to have a single-node cluster and gossip will still work so this statement is incorrect:

            In gossip protocol a minimum number of nodes are needed to take part.

            For best practice, we recommend 3 replicas in each data centre (replication factor of 3) so you need a minimum of 3 nodes in each data centre. With a replication factor of 3, your application can survive a node outage for consistency levels of ONE, LOCAL_ONE or the recommended LOCAL_QUORUM so these statements are incorrect too:

            Suppose if one of the participating node goes down, then a new node needs to replace it. But it would take time to spawn a new replacement node, and this is a situation similar to master failure in mongo.

            The only ways to introduce single points-of-failure to your Cassandra cluster are:

            • deploying multiple instances on a single physical host (not recommended)
            • using shared storage (e.g. SAN, NAS, NFS) for all nodes (not recommended)

            As a side note, a friendly warning that other users may vote to close your question because comparisons are usually frowned upon since the answers are often based on opinions. Cheers!

            Source https://stackoverflow.com/questions/71318376


            What does solana-test-validator do on the background?
            Asked 2022-Feb-27 at 13:18

            When run solana-test-validator it begins a new process with the following output:



            Answered 2022-Feb-27 at 13:18

            To your first question the answer is Yes.

            To your second question, the test-validator is a ledger node and as such, just like devnet/testnet/mainnet-beta, there is the temporal record (block) as you progress through time, whether there was something done or not.


            When you start and run solana-test-validator for the first time it will create a default ledger called test-ledger in the directory where you started it from.

            If you start the test validator again, in the same location, it will open the existing ledger. Over time the ledger may become quite large.

            If you want to start with a clean ledger, you can either:

            1. rm -rf test-ledger or...
            2. solana-test-validator --reset

            Source https://stackoverflow.com/questions/71218486


            How to use asyncio and aioredis lock inside celery tasks?
            Asked 2022-Feb-10 at 15:40
            1. Possibility to run asyncio coroutines.
            2. Correct celery behavior on exceptions and task retries.
            3. Possibility to use aioredis lock.

            So, how to run async tasks properly to achieve the goal?

            What is RuntimeError: await wasn't used with future (below), how can I fix it?

            I have already tried:

            1. asgiref

            async_to_sync (from asgiref https://pypi.org/project/asgiref/).

            This option makes it possible to run asyncio coroutines, but retries functionality doesn't work.

            2. celery-pool-asyncio


            Same problem as in asgiref. (This option makes it possible to run asyncio coroutines, but retries functionality doesn't work.)

            3. write own async to sync decorator

            I have performed try to create my own decorator like async_to_sync that runs coroutines threadsafe (asyncio.run_coroutine_threadsafe), but I have behavior as I described above.

            4. asyncio module

            Also I have try asyncio.run() or asyncio.get_event_loop().run_until_complete() (and self.retry(...)) inside celery task. This works well, tasks runs, retries works, but there is incorrect coroutine execution - inside async function I cannot use aioredis.

            Implementation notes:

            • start celery command: celery -A celery_test.celery_app worker -l info -n worker1 -P gevent --concurrency=10 --without-gossip --without-mingle
            • celery app:


            Answered 2022-Feb-04 at 07:59

            Maybe it helps. https://github.com/aio-libs/aioredis-py/issues/1273

            The main point is:

            replace all the calls to get_event_loop to get_running_loop which would remove that Runtime exception when a future is attached to a different loop.

            Source https://stackoverflow.com/questions/70960234


            How to make a redis cluster in k8s environment using nodeport service type?
            Asked 2022-Jan-26 at 07:00

            I have tried to make a redis cluster in k8s environment using "NodePort" type of service. More specifically, I want to compose a redis cluster across two different k8s cluster.

            When I used LoadBalancer(External IP) for service type, cluster was made successfully. The problem is NodePort.

            After I command redis-cli --cluster create, it stucks on "Waiting for the cluster to join"

            Below is the logs of cluster create command. I deployed 4 leader pods and 4 slave pods with individual nodeport service.



            Answered 2022-Jan-20 at 07:00

            i am not sure actual process you are following to create the cluster of Redis however i would suggest checking out the helm chart to deploy the Redis cluster on K8s.

            Using helm chart it's easy to manage and deploy the Redis cluster on K8s.


            To deploy chart you just have to run command :

            Source https://stackoverflow.com/questions/70781843


            Correct EventStore config for a 3 node cluster?
            Asked 2022-Jan-19 at 21:04

            So I had EventStore 5.0.7 installed as a 3 node cluster, working just fine.

            I tried to upgrade to EventStore 21.10.1. The config for EventStore has changed substantially since the move from 5.x to 20.x and 21.x, and despite multiple readings of all kinds of documentation, I'm still doing something wrong.

            What we see is 6 nodes appearing - each server twice - and the gossip failing, and nothing working, ie, cannot insert events.

            What am I doing wrong?

            EventStore 5.0.7

            EventStore 21.10.1

            Config for EventStore 21.10.1



            Answered 2022-Jan-14 at 17:24

            This online tool : https://configurator.eventstore.com/ should help you setup the configuration correctly

            Source https://stackoverflow.com/questions/70695027


            How can you tell if a solana node is synced?
            Asked 2022-Jan-18 at 03:50

            I'm running a solana node using the solana-validator command (see Solana docs).

            And I'd like to know if my validator is ready to connect to the http/rpc/ws port. What's the quickest way to do check to see if it's synced?

            Currently, I'm using wscat to check to see if I can connect to the websocket, but am unable to. I'm not sure if that's because the node isn't setup right, or it's not synced, etc.

            I know if I run solana gossip I should be able to see my IP in the list that populates... but is that the best way?



            Answered 2022-Jan-04 at 18:54

            Take a look at solana catchup, which does exactly what you're asking for: https://docs.solana.com/cli/usage#solana-catchup

            Source https://stackoverflow.com/questions/70583566


            RabbitMQ, Celery and Django - connection to broker lost. Trying to re-establish the connection
            Asked 2021-Dec-23 at 15:56

            Celery disconnects from RabbitMQ each time a task is passed to rabbitMQ, however the task does eventually succeed:

            My questions are:

            1. How can I solve this issue?
            2. What improvements can you suggest for my celery/rabbitmq configuration?

            Celery version: 5.1.2 RabbitMQ version: 3.9.0 Erlang version: 24.0.4

            RabbitMQ error (sorry for the length of the log:



            Answered 2021-Aug-02 at 07:25

            Same problem here. Tried different settings but with no solution.

            Workaround: Downgrade RabbitMQ to 3.8. After downgrading there were no connection errors anymore. So, I think it must have something to do with different behavior of v3.9.

            Source https://stackoverflow.com/questions/68602834


            Alert manager in prometheus not starting
            Asked 2021-Nov-13 at 20:20

            i configured prometheus alertmanager no error in installation but systemctl status alertmanager.service gives



            Answered 2021-Nov-13 at 06:47

            Do you want to run AlertManager in HA mode? It's enabled by default and requires an instance with RFC-6980 IP address.

            You can specify this address with the flag alertmanager --cluster.advertise-address=

            Otherwise disable HA with the specifying empty value for the flag: alertmanager --cluster.listen-address=

            Source https://stackoverflow.com/questions/69939266


            How to pass broker_url from Django settings.py to a Celery service
            Asked 2021-Nov-03 at 03:13

            I have Celery running as a service on Ubuntu 20.04 with RabbitMQ as a broker.

            Celery repeatedly restarts because it cannot access the RabbitMQ url (RABBITMQ_BROKER), a variable held in a settings.py outside of the Django root directory.

            The same happens if I try to initiate celery via command line.

            I have confirmed that the variable is accessible from within Django from a views.py print statement.

            If I place the RABBITMQ_BROKER variable inside the settings.py within the Django root celery works.

            My question is, how do I get celery to recognise the variable RABBITMQ_BROKER when it is placed in /etc/opt/mydjangoproject/settings.py?

            My celery.py file:



            Answered 2021-Nov-02 at 12:57

            Add the following line to the end of /etc/opt/mydjangoproject/settings.py to have celery pick up the correct broker url (casing might vary based on the version of celery you are using):

            Source https://stackoverflow.com/questions/69808507

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install Gossip

            You can download it from GitHub.
            You can use Gossip like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Gossip component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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