chronicle | find everything | Proxy library
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find everything you've ever found.
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QUESTION
I have an application using Boot Strap running with cassandra 4.0, Cassandra java drive 4.11.1, spark 3.1.1 into ubuntu 20.4 with jdk 8_292 and python 3.6.
When I run a function that it call CQL by spark, the tomcat gave me the error bellow.
Stack trace:
...ANSWER
Answered 2021-May-25 at 23:23I openned two JIRA to understand this problem. See the links below:
QUESTION
Is there any reasonable way to read or write to a Chronicle Queue from a C# application? It runs on Mono on Linux if that matters.
...ANSWER
Answered 2021-May-06 at 08:02We would suggest wrapping the C/C++ version which is a licensed product.
Adding a wrapper of our own is on our roadmap.
You can contact sales@chronicle.software for more details.
QUESTION
One of our system has a micro service architecture using Apache Kafka as a service bus. Low latency is a very important factor but reliability and consistency (exactly once) are even more important.
When we perform some load tests we noticed signifiant performance degradation and all investigations pointed to big increases in Kafka topics producer and consumer latencies. No matter how much configuration we changed or more resources we added we could not get rid of the symptoms.
At the moment our needs are processing 10 transactions per second (TPS) and the load test is exercising 20 TPS but as the system is evolving and adding more functionality we know we'll reach a stage when the need will be 500TPS so we started being worried if we can achieve this with Kafka.
As a proof of concept I tried to switch to one of our micro services to use a chronicle-queue instead of a Kafka topic. It was easy to migrate following the avro example as from Chronicle-Queue-Demo git hub repo
...ANSWER
Answered 2021-Apr-20 at 01:55Hand building the Avro object each time seems a bit of a code smell to me.
Can you create a predefined message -> avro serializer and use that to feed the queue?
Or, just for testing, create one avro object outside the loop and feed that one object into the queue many times. That way you can see if it is the building or the queuing which is the bottleneck.
More general advice:
Maybe attach a profiler and see if you are making an excessive amount of object allocations. Which is particularly bad if they are getting promoted to higher generations.
See if they are your objects or Chronicle Queue ones.
Is your code maxing out your ram or cpu (or network)?
QUESTION
I am working on some code for an online bible. I need to identify when references are written out. I have looked all through stackoverflow and tried various regex examples but they all seem to fail with single books (eg Jude) as they require a number to proceed the book name. Here is my solution so far :
...ANSWER
Answered 2021-Mar-26 at 14:50It does not match as it expects 2 characters using (([ .)\n|])([^a-zA-Z]))
where the second one can not be a char a-zA-Z due to the negated character class, so it can not match the s
in Jude some
.
What you might do is make the character class in the second part optional, if you intent to keep all the capture groups.
You could also add word boundaries \b
to make the pattern a bit more performant as it is right now.
See a regex demo
(Note that Jude is listed twice in the alternation)
If you only want to use 3 groups, you can write the first part as:
QUESTION
I am working on a product page where the user has an option to filter on different boardgames. What I want to do is to give the user an option to filter on time, category of the game, number of players and age. When the user enters a checkbox on all 4 options there should be some games recommended based on the criteria. However when I check multiple boxes I get no result, what am I doing wrong? (I have more games in my file but post small amount)
Here's my code:
...ANSWER
Answered 2021-Mar-14 at 09:44So here is the problem :
QUESTION
I would like to implement functionality for being able to search a QPlainTextEdit
for a query string, and display all matched lines in a table. Selecting a row in the table should move the cursor to the correct line in the document.
Below is a working example that finds all matches and displays them in a table. How can I get to the selected line number in the string that the plaintextedit holds? I could instead use the match.capturedEnd()
and match.capturedStart()
to show the matches, but line numbers are a more intuitive thing to think of, rather than the character index matches.
ANSWER
Answered 2021-Mar-13 at 15:14In order to move the cursor to a specified position, it's necessary to use the underlying QTextDocument using document()
.
Through findBlockByLineNumber
you can construct a QTextCursor and use setTextCursor()
to "apply" that cursor (including the actual caret position) to the plain text.
QUESTION
ANSWER
Answered 2021-Feb-17 at 18:51This could be achieved by adding the CSS rule
QUESTION
I have the shiny app below in which I want to put in the header an image, a title and four actionbuttons like in the attached screenshot. The 4 buttons should be below the title and not cover the image. How can I adapt it? Does it depend on screen resolution? The font and font sizes should not change.
It should be like:
...ANSWER
Answered 2021-Jan-06 at 17:49Too much left padding was pushing it to the right. Try this
QUESTION
I have some code that goes through the cast list of a show or movie on Wikipedia. Scraping all the actor's names and storing them. The current code I have finds all the in the list and stores their title tags. It currently goes:
ANSWER
Answered 2021-Feb-06 at 19:19QUESTION
Each example of Chronicle map needs to be given an "entries" size in the builder but I don't understand the impact this value has on a persisted map:
...ANSWER
Answered 2021-Jan-29 at 11:27If the number of entries is too small, it will have to resize, which comes at a small cost, and it won't be arranged as efficiently.
In general, it is better to oversize the map so you don't have to worry about this. On Linux systems it uses sparse files so you might not even end up using more disk space.
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