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QUality Optimized Reads from the University of Maryland
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Lines of Code : 9License : Non-SPDX (NOASSERTION)
Copyquorum -s 50M read1.fastq read2.fastq
@1204
GACCGGGCATGGGCTGAGCCTGTTCGGGAAGCTGACGGAGCCGGAAGAGGCCGGGATCGACCCTTCCGCCCCGCCCGCCGACTGGGTCGACCGGCCGGGCG
>1204 86:sub:T-C 91:3_trunc 62:5_trunc
CTTCCGCCCCGCCCGCCGACTGGGCCGAC
0 pkg-config --exists jellyfish-2.0 && echo OK
./configure --prefix=/path/where/to/install
make
make install
def number_of_posts(self) -> int:
return self.user_data["edge_owner_to_timeline_media"]["count"] Community Discussions
Trending Discussions on Quorum
QUESTION
hello i'm using css counter to display the number of div that have a specific class inside a section but i don't know why the result of my code is alwase 0 this the code
...ANSWER
Answered 2021-Jun-15 at 12:21There are two problems which are causing the counter not to be incremented.
The first is that the CSS:
QUESTION
I am trying to have 1 redis master with 2 redis replicas tied to a 3 Quorum Sentinel on Kubernetes. I am very new to Kubernetes.
My initial plan was to have the master running on a pod tied to 1 Kubernetes SVC and the 2 replicas running on their own pods tied to another Kubernetes SVC. Finally, the 3 Sentinel pods will be tied to their own SVC. The replicas will be tied to the master SVC (because without svc, ip will change). The sentinel will also be configured and tied to master and replica SVCs. But I'm not sure if this is feasible because when master pod crashes, how will one of the replica pods move to the master SVC and become the master? Is that possible?
The second approach I had was to wrap redis pods in a replication controller and the same for sentinel as well. However, I'm not sure how to make one of the pods master and the others replicas with a replication controller.
Would any of the two approaches work? If not, is there a better design that I can adopt? Any leads would be appreciated.
...ANSWER
Answered 2021-Jun-09 at 15:49You can deploy Redis Sentinel using the Helm package manager and the Redis Helm Chart.
If you don't have Helm3 installed yet, you can use this documentation to install it.
I will provide a few explanations to illustrate how it works.
First we need to get the values.yaml file from the Redis Helm Chart to customize our installation:
QUESTION
I have a cluster of Artemis in Kubernetes with 3 group of master/slave:
...ANSWER
Answered 2021-Jun-02 at 01:56I've taken your simplified configured with just 2 nodes using a non-wildcard queue with redistribution-delay of 0, and I reproduced the behavior you're seeing on my local machine (i.e. without Kubernetes). I believe I see why the behavior is such, but in order to understand the current behavior you first must understand how redistribution works in the first place.
In a cluster every time a consumer is created the node on which the consumer is created notifies every other node in the cluster about the consumer. If other nodes in the cluster have messages in their corresponding queue but don't have any consumers then those other nodes redistribute their messages to the node with the consumer (assuming the message-load-balancing is ON_DEMAND and the redistribution-delay is >= 0).
In your case however, the node with the messages is actually down when the consumer is created on the other node so it never actually receives the notification about the consumer. Therefore, once that node restarts it doesn't know about the other consumer and does not redistribute its messages.
I see you've opened ARTEMIS-3321 to enhance the broker to deal with this situation. However, that will take time to develop and release (assuming the change is approved). My recommendation to you in the mean-time would be to configure your client reconnection which is discussed in the documentation, e.g.:
QUESTION
I can access a Blockchain Service based on Quorum, and I'm using Nethereum Library to interact with Smart Contract.
When I deploy a new Smart Contract, Nethereum gives the address and the ABI of SmartContract.
But I can't access the ABI of SmartContract without deploying the process. How can I get ABI based on the address of Smart Contract?
...ANSWER
Answered 2021-May-20 at 08:50You can get ABI JSON during compilation of the contract source code. The inputs for compilation are source code and few other values (such as optimizer settings)... The outputs include the ABI JSON and bytecode... So you don't really need to deploy the contract to get the json, just compile it (without deployment).
It's not possible to get ABI JSON purely from a bytecode (or an address that contains just the bytecode).
If the contract has source code published, you can compile the source code to get the ABI JSON.
If if doesn't have the source code published, it's also possible that the contract implements some standard (e.g. ERC-20). If you know whether and what standard it implements, you can use a general ABI JSON that reflects on this standard (e.g. this is ABI JSON of a ERC-20 standard). However, it does not reflect any functions that the contract might have used to extend the standard-defined minimum.
QUESTION
I am setting up a cluster of Artemis in Kubernetes with 3 group of master/slave:
...ANSWER
Answered 2021-May-11 at 23:49First, it's important to note that there's no feature to make a client reconnect to the broker from which it disconnected after the client crashes/restarts. Generally speaking the client shouldn't really care about what broker it connects to; that's one of the main goals of horizontal scalability.
It's also worth noting that if the number of messages on the brokers and the number of connected clients is low enough that this condition arises frequently that almost certainly means you have too many brokers in your cluster.
That said, I believe the reason that your client isn't getting the messages it expects is because you're using the default redistribution-delay (i.e. -1) which means messages will not be redistributed to other nodes in the cluster. If you want to enable redistribution (which is seems like you do) then you should set it to >= 0, e.g.:
QUESTION
for a future poc i need to deploy an apache atlas 2.1 stack but i can't found the parameter for the cassandra backend connection in their documentation. if anyone got a link or had already made a implementation with password authentication.
this is my current config file if it can help.
...ANSWER
Answered 2021-May-12 at 13:01You need to look into the JanusGraph documentation for that. According to it, there are two properties there: storage.username and storage.password that could be used prefixed by atlas.graph.storage.username: atlas.graph. & atlas.graph.storage.password
QUESTION
I am trying to work with DELETE route functionality. What I am trying to do is get the id from req.params and use it to delete the document associated with that particular id. I am sharing my code below that also the error that I am getting. Can someone please tell me why I am getting this error? I am using CosmosDb here.
ANSWER
Answered 2021-May-08 at 06:15Did you try to use below code instead? Azure official sample here.
QUESTION
Hello!
I have task in playbook which running code in powershell
ANSWER
Answered 2021-Apr-30 at 10:14The issue was with win_shell module. I tried to use ansible.windows.win_powershell and it helped. Variable began contain symbols in language which I need.
Thanks for taking time!
QUESTION
Context:
I'm trying to understand the motivation behind existence of WaitBeforeForcingMasterFailover property (and the code associated with it) inside of ServiceStack.Redis.RedisSentinel.
If I interpreted the code right - the meaning behind this property seems to cover cases like:
- We have a connection to a healthy sentinel that tells us that a master is at host X
- When we try to establish a connection to the master at host X - we fail due to some reason.
So the logic will be - if we continuously fail to create a connection to X for WaitBeforeForcingMasterFailover period - initiate a force failover.
The failover does not need to reach a quorum and can elect a new master just with 1 sentinel available.
SENTINEL FAILOVER Force a failover as if the master was not reachable, and without asking for agreement to other Sentinels (however a new version of the configuration will be published so that the other Sentinels will update their configurations).
Source: https://redis.io/topics/sentinel#sentinel-api
The way it seems to me - this feature can be beneficial in some cases and troublesome in other cases.
For example in case of a network partition if a client is left connected to a minority of sentinels (they can't reach a quorum) and these sentinels point to a master that is no longer reachable - this force failover option will trigger a failover within reachable partition, thus potentially creating a split brain situation.
Coming from Java background I also haven't seen such features available in popular redis clients such as Jedis and Lettuce.
This got me wondering on the following questions:
Are there strong reasons for this feature to be enabled by default? (I understand that you can effectively disable it if you want to by setting a huge value in it). Do they really worth the risk of interfering with natural sentinels workflow and potentially introducing problems like the one I've mentioned before?
Will the library work fine with this option disabled? Are there are cases that I might have missed and turning this feature off will lead to problems even with some happy paths (no network partition, just regular failovers because of a deployment or a sudden node failure)?
ANSWER
Answered 2021-Apr-30 at 04:41It's a fallback that if RedisSentinel is unable to establish a connection to a master client within 60s (default) it will instruct the connected sentinel to force a failover.
You can increase the wait time when configuring RedisSentinel:
QUESTION
I've configured a small cluster with just one primary/backup group. So far, failover and failback work as expected.
But as this configuration is susceptible to network-isolation problems and I don't think, the pinger approach heals this sufficiently, I would prefer the backup to just be there and receive updates, but not automatically do a failover when the primary is unreachable. Instead I want an intelligent human with better situational awareness to make the failover decision.
The decreased availability introduced by such a procedure is acceptable for us.
I've tried to get the backup to act this way (arbitrarily delaying failover) by using the following ha-policy > replication > slave parameters:
quorum-sizequorum-vote-waitvote-retriesvote-retry-wait
but had no success so far.
Is it possible to somehow delay the automatic failover arbitrarily, and trigger the actual failover by changing the broker.xml?
...ANSWER
Answered 2021-Apr-27 at 15:48ActiveMQ Artemis doesn't implement the functionality you're looking for - at least not in any automated way. I expect you could arbitrarily delay failover by setting quorum-size to something larger than the actual size of the cluster. However, there is no management operation to tell the backup broker to activate and become live. The only way you could do that would be to stop the broker, change the ha-policy to be a master and then restart the broker.
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