relly | A small RDBMS implementation to learn how RDBMS | SQL Database library
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kandi X-RAY | relly Summary
A small RDBMS implementation to learn how RDBMS works
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QUESTION
sheet example : https://docs.google.com/spreadsheets/d/1r7N-KeQsWjoI945KcrMDJ8skcl4ctglY-8E68as71oE/edit#gid=1301603299
original sheet gets data to col B using IMPORTHTML when ever it changes and i used to do well untill recently when google started to cache some data
i was using
...ANSWER
Answered 2021-Jun-02 at 01:24To compare dates numerically use Date().valueOf() or Date().getTime();
QUESTION
I am struggling a query problem with Grafana variable
query in Dashboard configuration. The query variable should return the number of nodes joined the swarm but it did not. In my case, I only have one swarm node but the variable in Grafana returns up to 5 nodes. I relly don't understand what causes the error.
Here is the situation: I set up docker swarm in my laptop as a manager, only my laptop with the swarm mode, no other nodes joined.
I used the source from https://github.com/stefanprodan/swarmprom to monitor the host by node-exporter
. I kept the prometheus.yml
as original.
when I executes the metric from prometheus
, only one host returned. This is correct because I only had one node. You can see the figure below
But when I did the query in Grafana, Grafana returned 5 hosts. It was really strange here. I dont know why I got 5 hosts because I had only one swarm node.
I did check the git repo again with play-with-docker, configured one manager node and 2 client nodes. Everything worked fine. The query in Grafana returned 3 hosts.
Here is the query formula: label_values(node_uname_info{job="node-exporter"}, instance)
Thank you so much for you supporting in advance.
ANSWER
Answered 2021-Mar-08 at 16:32What you have faced is a consequence of ephemeral container nature, one of the challenges in monitoring container applications. Before we go into any solution options, let us see ...
How it did happen that Grafana shows more instances than there is.Prometheus is a time-series database. Once in a while it contacts its scraping targets and collects metrics. Those metrics are saved with a time stamp and a set of labels, one of which is the 'instance' label in question.
The instance label normally consists of an address (a host/domain name or an IP-address) and a port, that prometheus uses to scrape metrics. In this example instance address is an IP-address, because the list of targets is obtained through a DNS-server (dns_sd_configs
in job definition).
When you deployed the stack, docker created at least one container for each service, including node-exporter and prometheus. Soon after that prometheus started obtaining metrics from node-exporter instance, however after some time node-exporter container was recreated. Either you updated it, or killed it, or it's crashed - I can't know, but the key is - you had a new container. The new node-exporter container got a different IP-address and because of that metrics from the new instance received a different 'instance' label.
Remember that prometheus is a time series database? You have not lost metrics from the instance that went offline, they're still in the database. It is just at this point you had started collecting node-exporter metrics with a different label set (new IP-address in the 'instance' label at least). When Grafana queries labels for you, it requests metrics from the period currently set on the dashboard. Since the period was 'today', you've seen instances that were present today. In other words when you request a list of possible instance values, you receive a list of values for the period without any filtering for currently active instances.
General solution.You need to use some static label(s) for this task. An 'instance' or a 'pod_name' (K8s) labels are a poor choice if you don't like to see dead instances in the list. Pick a label that represents the thing or unit you want to watch and stick to it. Since node-exporter is to monitor node metrics, I think a host name label will do.
If you see no way in avoiding use of dynamic labels, you can use a short time range on the dashboard, so that the label_values()
function does not return long dead labels. You'd like to set variable refresh option to 'On Time Range Change', so that you can use a short dashboard interval to see and pick currently active instances, and a long period for any other case.
As I said previously, using a host name label will be better in this case. The problem is - there is no such label in the metric in question. Checking swarmprom repo, I found that this node-exporter was made to expose a host name via node_meta
label (here). So it is possible to map a host name to an instance(s) using chained variables.
Another problem is that this solution may require changes in panel queries. Since one host name can resolve into multiple instances, it is essential that panel queries use regex match for 'instance' label (that is =~
instead of =
).
Here's how to do all this:
- Create a new variable called 'hostname', set refresh option to 'On Time Range Change', and use this for the query field:
QUESTION
Using c# hi, i need to match 2 list, to asing 1 valor from 1 list, to the other list at the same range.
is something like this :
...ANSWER
Answered 2021-Jan-23 at 11:08Seems like you are trying to copy one list into another? If the second list is empty, you can do it like:
QUESTION
I have been stuck on this problem for about 1 hour : I want my command while to access in the next block. Case is a class: cases is the object. I made a definition that say on some condition : my object case become NoneType. There is the condition if element_voisin == case to be sure that the element is still a case and not a NoneType. If it's still a case I want to access case.ajouter une mine voisine() but my program won't go in. If you need more information tell me! I relly want this to work please.
...ANSWER
Answered 2020-Oct-29 at 19:49Replace
QUESTION
For a problem, I have to use dynamic allocation and functions (using pointer variables only) to read the names from the .txt file and sort the names in lexical order. However, I cannot even get the read function to work properly. This is what it wrote:
...ANSWER
Answered 2020-Oct-20 at 15:10To elaborate on WhozCraig's comment, let us assume the following:
names
resides on the stack, so we give it address 0x7f001000.- The array of strings you allocates resides on the heap, so we give it address 0x1000
- You assigned that address to
names
, so address 0x7f001000 contains the value 0x1000.
Inside readNames
, a
is the address of names
, so the expression *(a[i])
can be rewritten as:
QUESTION
I'm having an issue with my app when I inflate an recyclerview. Inside the recyclerview, some cards are inflated and when it comes out to the screen, the toolbar disappears and the settings button can't be used. If someome could help me or give me some hints of what may be happening... I'd be relly grateful.
Using the latest SDK and libraries versions.
Code is below.
activity_main.xml:
...ANSWER
Answered 2020-Sep-28 at 04:25Because you align the top of Recyclerview to the top of parent (ConstraintLayout) so it overs the toolbar.
Replace app:layout_constraintTop_toTopOf="parent"
with app:layout_constraintTop_toBottomOf="@id/toolbar"
to align the top of Recyclerview to the bottom of Toolbar
Add these attrs to your Toolbar:
app:layout_constraintBottom_toTopOf="@id/conteudoRSS"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
QUESTION
I ve got two SVG images and I would like to animate them as following, first to reveal the Full Screen
text from left to right, and after to cover with the second SVG the word Screen
revealing the whole second SVG. Hence in the end I will have the word "Full" black space from second svg, and the words "size view"
ANSWER
Answered 2020-Aug-26 at 13:24There are many options how to do it:
- use clipping and animate the clip
- use masking and animate the mask
- animate directly the cover (below using
stroke-dashoffset
) - ... ?
You can use plain CSS or use javascript (possibly with libraries like svg.js or snap.svg)
The correct one depends on many factors.
Below an (simlified) example, inspired by this page, using path
element as a cover, stroke-dasharray
as "long line lone space", and animating stroke-dashoffset
to get desired result:
QUESTION
I wanted to send/receive MQTT messages from Perl. For various reasons (MQTT 5 support, TLS) I don't want to use existing Perl libraries. So I tried to create XS bindings to Paho MQTT C Library. I somehow adapted provided example to link Perl module to Paho library using relly basic Perl XS:
...ANSWER
Answered 2020-Jul-30 at 09:48Here is an example of how you can return the client as a perl object:
QUESTION
I am a very beginner in Python and I am trying to become more confident opening .txt and .csv files. As exercise, I am trying to open a file named "Trissino.txt", where is contained some lines of a poetry. So I typed:
...ANSWER
Answered 2020-Apr-14 at 14:45You are checking 'sinistra' outside the loop, you must check while you are traversing each line from the text file.
QUESTION
I use keras(tensorflow) to train my model. I use the function fit_generator
cause I use ImageDataGenerator
to make data augmentation.
Here's my question,I find there's two kind of training process.The former I don't know what it is, but the later is just the model is learning from the original data.And the situation is below:
...ANSWER
Answered 2020-Apr-07 at 12:26fit_generator
also create a validation data generator.So it's validation process is also divided in batchs, and what I see after training is just the intermediate result。And model won't train on the validation data.
here's some relative discussion about that:
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