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@Override
public boolean releaseConnection(Connection connection) {
connectionPool.add(connection);
return usedConnections.remove(connection);
}
Community Discussions
Trending Discussions on releases
QUESTION
Would be great if someone can help me understand how flock functions. Lets says I have the below scenario:
...ANSWER
Answered 2021-Jun-16 at 02:07I tried testing this scenarios with a working example script and I found that the waiting jobs are processed in a random manner.
QUESTION
I am wondering how I can create something like this using JavaScript and A-frame (https://aframe.io).
I would like to create an onload function called load()
that will check the value of a variable x and if x is one, the gltf
with the id of 1 will show and the gltf's with the id of 2 and 3 will not be visible. The same goes for gltf's 2 and 3. How can I acomplish this? My code:
ANSWER
Answered 2021-Jun-15 at 17:39Store the valid id
s in an array and loop through each one, then remove correspondingly.
QUESTION
I have run a topology, and I used the Meter type in metric Reporting API v2. In the execute method I mark this metric. So it will mark an event whenever the execute method is called. But when I compare this value with the __execute-count, I see huge differences. Does anyone know why this happens?
These are the values from my log which are gathered at the same time:
9:v7 __execute-count {v0:v7=44500}
9:v7 tuple_inRate.count 664129
Update: When I use the mark method on the Meter metric, I will get different results in comparison with the Counter metric. But still, I do not understand why the values from the counter metric (tuple counter) are not the same as the __execute-count.
...ANSWER
Answered 2021-Jun-11 at 06:51As given in this answer, Storms Internal Metrics are just estimated by a percentage of the real data flow. Initially, it uses 5% of incoming tuples to make those estimations. This may lead to inaccuracies for extreme high or low throughputs.
EDIT: The documentation describes the following:
In general all of these tuple count metrics are randomly sub-sampled unless otherwise stated. This means that the counts you see both on the UI and from the built in metrics are not necessarily exact. In fact by default we sample only 5% of the events and estimate the total number of events from that. The sampling percentage is configurable per topology through the topology.stats.sample.rate config. Setting it to 1.0 will make the counts exact, but be aware that the more events we sample the slower your topology will run (as the metrics are counted in the same code path as tuples are processed). This is why we have a 5% sample rate as the default.
EDIT 2 In this post, there is more information about the estimation:
The way it works is that if you choose a sampling rate of 0.05, it will pick a random element of the next 20 events in which to increase the count by 20. So if you have 20 tasks for that bolt, your stats could be off by +-380.
By the way, execute_count
is just an increasing number, while your tuple_inRate.count
is a rate, isn`t it?
QUESTION
Why kubectl cluster-info is running on control plane and not master node And on the control plane it is running on a specific IP Address https://192.168.49.2:8443 and not not localhost or 127.0.0.1 Running the following command in terminal:
- minikube start --driver=docker
😄 minikube v1.20.0 on Ubuntu 16.04 ✨ Using the docker driver based on user configuration 🎉 minikube 1.21.0 is available! Download it: https://github.com/kubernetes/minikube/releases/tag/v1.21.0 💡 To disable this notice, run: 'minikube config set WantUpdateNotification false'
👍 Starting control plane node minikube in cluster minikube 🚜 Pulling base image ... > gcr.io/k8s-minikube/kicbase...: 358.10 MiB / 358.10 MiB 100.00% 797.51 K ❗ minikube was unable to download gcr.io/k8s-minikube/kicbase:v0.0.22, but successfully downloaded kicbase/stable:v0.0.22 as a fallback image 🔥 Creating docker container (CPUs=2, Memory=2200MB) ... 🐳 Preparing Kubernetes v1.20.2 on Docker 20.10.6 ... ▪ Generating certificates and keys ... ▪ Booting up control plane ... ▪ Configuring RBAC rules ... 🔎 Verifying Kubernetes components... ▪ Using image gcr.io/k8s-minikube/storage-provisioner:v5 🌟 Enabled addons: storage-provisioner, default-storageclass 🏄 Done! kubectl is now configured to use "minikube" cluster and "default" namespace by default
- kubectl cluster-info
Kubernetes control plane is running at https://192.168.49.2:8443 KubeDNS is running at https://192.168.49.2:8443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
...To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
ANSWER
Answered 2021-Jun-15 at 12:59The Kubernetes project is making an effort to move away from wording that can be considered offensive, with one concrete recommendation being renaming master to control-plane. In other words control-plane
and master
mean essentially the same thing, and the goal is to switch the terminology to use control-plane
exclusively going forward. (More info in this answer)
The kubectl
command is a command line interface that executes on a client (i.e your computer) and interacts with the cluster through the control-plane
.
The IP address you are seing through cluster-info
is the IP address through which you reach the control-plane
QUESTION
I am updating my app with new library releases and I got an issue with my database. The released app currently using Room version 2.2.6 with FTS4. Currently having LONG for rowid
. The app runs smooth and no problem. But I want to use Room version 2.3.0 and according to the docs:
An FTS entity table always has a column named rowid that is the equivalent of an INTEGER PRIMARY KEY index. Therefore, an FTS entity can only have a single field annotated with PrimaryKey, it must be named rowid and must be of INTEGER affinity. The field can be optionally omitted in the class but can still be used in queries.
I should use INT not LONG.
...ANSWER
Answered 2021-Jun-15 at 04:11An FTS entity table always has a column named rowid that is the equivalent of an INTEGER PRIMARY KEY index.
In brief SQLite's INTEGER does not imply a Java/Kotlin Integer/Int/int it is a column affinity/type.
If you look at the Datatypes in SQLite3 then an INTEGER can be up to 8 bytes (64 bit signed). Which in Java/Kotlin is long/Long.
Further evidence can be seen with the SQLiteDatabase insert
convenience method as it returns the id (rowid) of the inserted row not as an int but as a long.
Returns long - the row ID of the newly inserted row, or -1 if an error occurred.
SQLiteAutoincrement explains about rowid and that in theory it can be from 1-9223372036854775807 (you can even have negative values).
As such, it is wrong to use int/Int/Integer for the rowid as in theory (not that likely in practice), the rowid can be larger than an int/Int/Integer.
I should use INT not LONG.
I'd suggest that you should use Long. It makes no difference to the data as SQLite will store an integer in as little space as it can. Furthermore, it makes no difference to the table(s) that room creates as the COLUMN TYPE will be INTEGER.
QUESTION
I am wondering how I can use A-frame (https://aframe.io) to fade out my gltf model after around 3 seconds. I'm not sure exactly how I'd be able to do this. My current code is below:
...ANSWER
Answered 2021-Jun-14 at 21:17You can try my model-relative-opacity component along with an animation component:
QUESTION
There is a Java 11 (SpringBoot 2.5.1) application with simple workflow:
- Upload archives (as multipart files with size 50-100 Mb each)
- Unpack them in memory
- Send each unpacked file as a message to a queue via JMS
When I run the app locally java -jar app.jar
its memory usage (in VisualVM) looks like a saw: high peaks (~ 400 Mb) over a stable baseline (~ 100 Mb).
When I run the same app in a Docker container memory consumption grows up to 700 Mb and higher until an OutOfMemoryError. It appears that GC does not work at all. Even when memory options are present (java -Xms400m -Xmx400m -jar app.jar
) the container seems to completely ignore them still consuming much more memory.
So the behavior in the container and in OS are dramatically different.
I tried this Docker image in DockerDesktop Windows 10
and in OpenShift 4.6
and got two similar pictures for the memory usage.
Dockerfile
...ANSWER
Answered 2021-Jun-13 at 03:31In Java 11, you can find out the flags that have been passed to the JVM and the "ergonomic" ones that have been set by the JVM by adding -XX:+PrintCommandLineFlags
to the JVM options.
That should tell you if the container you are using is overriding the flags you have given.
Having said that, its is (IMO) unlikely that the container is what is overriding the parameters.
It is not unusual for a JVM to use more memory that the -Xmx
option says. The explanation is that that option only controls the size of the Java heap. A JVM consumes a lot of memory that is not part of the Java heap; e.g. the executable and native libraries, the native heap, metaspace, off-heap memory allocations, stack frames, mapped files, and so on. Depending on your application, this could easily exceed 300MB.
Secondly, OOMEs are not necessarily caused by running out of heap space. Check what the "reason" string says.
Finally, this could be a difference in your app's memory utilization in a containerized environment versus when you run it locally.
QUESTION
I want to convert an html file to pdf using TeamDev jxbrowser. I want to trigger it automatically wihout any extra print dialog or popup etc just by executing some code. And I also want to set some extra settings. In the 6.X versions I can see more detailed options by coding
https://jxbrowser.support.teamdev.com/support/solutions/articles/9000013120-print-settings
...ANSWER
Answered 2021-Jun-14 at 10:51The Printing API that allows programmatically printing the currently loaded web page using the PDF printer is not available in JxBrowser 7. It's already on our roadmap. We do our best to introduce this functionality in one of the next versions.
I recommend that you follow us on https://twitter.com/JxBrowserTeam to be notified when this functionality is released.
UPD: In JxBrowser 7.13 the Printing API has been extended with functionality that allows programmatically configure print settings and print a web page without displaying the Print Preview dialog. The API allows you to save the currently loaded web page as a PDF document. Read more at https://jxbrowser-support.teamdev.com/docs/guides/printing.html#configuring-settings
The following example demonstrates how to save a web page as PDF:
QUESTION
ANSWER
Answered 2021-Jun-13 at 17:32You can give fixed height and width to the images as required by the carousel:
QUESTION
I've juste add ppa:ondrej/php
on my ubuntu server, and it prompt me the message below.
Why am I advised to add ppa:ondrej/nginx
(stable) too? What's the exact purpose of this?
For information I have already installed Nginx from the official doc.
...ANSWER
Answered 2021-Feb-06 at 12:33According to the homepage for ppa:ondrej/nginx
, here the PPA description:
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