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QUESTION
Apologies here in advance for this non-simplified use case.
During one of my data load processes, concurrent request transactions are used to fill MarkLogic.
Each concurrent thread does the following operations at a high level:
...ANSWER
Answered 2022-Apr-07 at 20:54When debugging, we do see concurrently when this transaction is being run, documents returned in the
cts:searchare locked for updates in other transactions. We are well aware of this possibility and are okay with it.
You may think that you are okay with it, but you are running into performance issues that are likely due to it, and are looking to avoid timeouts - so you probably aren't okay with it.
When you perform a search in an update transaction, all of the fragments will get a read-lock. You can have multiple transactions all obtain read locks on the same URI without a problem. However, if one of those transactions then decides it wants to update one of those documents, it needs to promote it's shared read-lock to an exclusive write-lock. When that happens, all of those other transactions that had a read-lock on that URI will get restarted. If they need access to that URI that has an exclusive write-lock then they will have to wait until the transaction that has the write-lock completes and lets go.
So, if you have a lot of competing transactions all performing searches with the same criteria and trying to snag the first item (or first set of items) from the search results, they can cause each other to keep restarting and/or waiting, which takes time. Adding more threads in an attempt to do more makes it even worse.
There are several strategies that you can use to avoid this lock contention.
Instead of cts:search() to search and retrieve the documents, you could use cts:uris(), and then before reading the doc with fn:doc() (which would first obtain a read-lock) before attempting to UPSERT (which would promote the read-lock to a write-lock), you could use xdmp:lock-for-update() on the URI to obtain an exclusive write-lock and then read the doc with fn:doc().
If you are trying to perform some sort of batch processing, using a tool such as CoRB to first query for the set of URIs to process (lock-free) in a read-only transaction, and then fire off lots of worker transactions to process each URI separately where it reads/locks the doc without any contention.
You could also separate the search and update work, using xdmp:invoke-function() or xdmp:spawn-function() so that the search is executed lock-free and the update work is isolated.
Some resources that describe locks and performance issues caused by lock contention:
- https://www.marklogic.com/blog/resolving-unresolvable-deadlocks/
- https://help.marklogic.com/Knowledgebase/Article/View/17/0/understanding-xdmp-deadlock
- https://help.marklogic.com/Knowledgebase/Article/View/understanding-locking-in-marklogic-using-examples
- https://help.marklogic.com/Knowledgebase/Article/View/strategies-to-ensure-if-locking-is-the-root-cause-for-performance-degradation-in-marklogic
QUESTION
The following query:
...ANSWER
Answered 2022-Apr-03 at 14:50To answer your question directly:
No, it is not configurable. https://dev.mysql.com/doc/refman/5.7/en/innodb-limits.html says:
- A maximum of 16 columns is permitted for multicolumn indexes.
It's a constant in the code:
https://github.com/mysql/mysql-server/blob/5.7/sql/sql_const.h#L40
QUESTION
I'm using MockingBird for mocks in a Swift 5 project. A test like this passes fine:
...ANSWER
Answered 2022-Mar-30 at 19:01I think I know the problem.
Change the parameter to any() as Int.Type.
The test file would look like this:
QUESTION
Following up from this question here: Accessing JavaScript variable in an iframe, from the parent window on same domain
For purposes of posting something testable here, I have a src.js file set up like:
...ANSWER
Answered 2022-Mar-21 at 15:02Here is what eventually worked for me. In JS library:
QUESTION
Hi guys so I can't seem to get the navbar to remain at the top of the screen. If I use position: fixed, the navbar remains on top of the content so you can't see it. position: sticky doesn't work. I presume this is due to having a set height on the body? Keen to know how to get this working with position: fixed! Here is the code:
ANSWER
Answered 2022-Mar-13 at 15:59The easiest way by far is to use sticky position but on header not on nav. Because as element I am sticky as long as my parent is visible on the screen. And since the height of header is not that big, it seems like having position:sticky on nav is not working. To know more about position sticky, you could read here.
Here is the working example:
QUESTION
Hi guys I can't seem to center my button within the flexbox container class="hero". Any ideas why this is?
the button is below the email form but is left aligned to it (start in the same position).
I am trying to center the button like the example on this link:https://codepen.io/freeCodeCamp/full/RKRbwL. My CSS code also has a CSS reset but I haven't pasted that in. Thanks!
...ANSWER
Answered 2022-Mar-09 at 14:53Just add
QUESTION
I am writing an automated test suite that needs to test functions against Uniswap v2 style automated market marker: do swaps and use different order routing. Thus, routers need to be deployed.
Are there any existing examples of how to deploy a testable Uniswap v2 style exchange in Brownie? Because Brownie is a minority of smart contract developers, are there any examples for Truffle or Hardhat?
I am also exploring the option of using a mainnet fork, but I am not sure if this operation is too expensive (slow) to be used in unit testing.
...ANSWER
Answered 2022-Feb-10 at 14:30Using a local testnet allows you to control very precisely the state of the blockchain during your test. However, it will require you to deploy every contract you need manually.
A fork of the mainnet will save you from having to deploy every contract already deployed on the mainnet. However you will sacrifice control over the environment and will require a connection to a node.
I've deployed Uniswap 2V on a testnet a few times. To do it you will need the bytecode and ABI for the following contracts: UniswapV2Factory, UniswapV2Pair, UniswapV2Router02 (I suppose you want the second version of the router). The Uniswap docs explains very well how to download them from NPM. For the router to work properly you will also need to deploy a WETH contract. I suggest deploying the one from this github page.
Before running this code, just make sure that your chain is running. For hardhat run the following command:
QUESTION
Given a document like;
...ANSWER
Answered 2022-Jan-16 at 07:11Yes it can, you can build the update pipeline in code like you did but you can also do it in Mongo with $cond like so:
QUESTION
I've got an @Published protocol array that I am looping through with a ForEach to present the elements in some view. I'd like to be able to use SwiftUI bindable syntax with the ForEach to generate a binding for me so I can mutate each element and have it reflected in the original array.
This seems to work for the properties that are implemented in the protocol, but I am unsure how I would go about accessing properties that are unique to the protocol's conforming type. In the example code below, that would be the Animal's owner property or the Human's age property. I figured some sort of type casting might be necessary, but can't figure out how to retain the reference to the underlying array via the binding.
Let me know if you need more detail.
...ANSWER
Answered 2022-Jan-28 at 05:44This is a thorny problem with your data types.
If you can change your data types, you can make this easier to solve.
For example, maybe you can model your data like this instead, using an enum instead of a protocol to represent the variants:
QUESTION
I am listening for changes of a publisher, then fetching some data asynchronously in my pipeline and updating the view with the result. However, I am unsure how to make this testable. How can I best wait until the expectation has been met?
View ...ANSWER
Answered 2022-Jan-12 at 20:00You need to wait asynchronously via expectation and check result via publisher.
Here is possible approach. Tested with Xcode 13.2 / iOS 15.2
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