lrucache | LRUCache for Go - A map linked-list backed LRU cache | Caching library
kandi X-RAY | lrucache Summary
kandi X-RAY | lrucache Summary
A map + linked-list backed LRU cache. Cached items belong to a primary and secondary cache key. This allows you to generate multiple versions of the same object yet purge all variations. For example:. The cache takes some liberties. For example, a delay prevents recently promoted items from being re-promoted (thus minimizing the occurrences of a global write lock on the linked list). Furthermore, the garbage collection keeps some artifacts around. We've found these compromises suitable for caching HTTP responses. There are now a number of respectable caching libraries for Go, such as GroupCache and Vitess. The cache is thread-safe.
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Top functions reviewed by kandi - BETA
- Promote adds a node to the list .
- New creates a new LRUCache .
- NewStatsdBuffer returns a new StatsdBuffer .
- Configure returns a new Configuration object .
- NewStats returns a Stats struct .
lrucache Key Features
lrucache Examples and Code Snippets
@Data
@AllArgsConstructor
@ToString
@EqualsAndHashCode
public class UserAccount {
private String userId;
private String userName;
private String additionalInfo;
}
public interface DbManager {
void connect();
void disconnect();
UserAc
def __contains__(self, key: T) -> bool:
"""
>>> cache = LRUCache(1)
>>> 1 in cache
False
>>> cache.set(1, 1)
>>> 1 in cache
True
"""
re
def __init__(self, n: int) -> None:
"""Creates an empty store and map for the keys.
The LRUCache is set the size n.
"""
self.dq_store = deque()
self.key_reference = set()
if not n:
LRUCac
Community Discussions
Trending Discussions on lrucache
QUESTION
We have a kstreams
app doing kstream-kstable
inner join. Both the topics are high volume with 256 partitions each. kstreams
App is deployed on 8 nodes with 8 GB heap each right now. We see that the heap memory keeps constantly growing and eventually OOM happens. I am not able to get the heap dump as its running in a container which gets killed when that happens. But, I have tried a few things to gain confidence that it is related to the state stores/ktable related stuff. Without the below RocksDBConfigSetter
the memory gets used up pretty quick, but with the below it is slowed down to some extent. Need some guidance to proceed further , thanks
I added below 3 properties,
...ANSWER
Answered 2021-May-17 at 09:30You could try to limit the memory usage of RocksDB across all RocksDB instances on one node. To do so you must configure RocksDB to cache the index and filter blocks in the block cache, limit the memtable memory through a shared WriteBufferManager
and count its memory against the block cache, and then pass the same Cache
object to each instance. You can find more details and a sample configuration under
https://kafka.apache.org/28/documentation/streams/developer-guide/memory-mgmt.html#rocksdb
With such a setup you can specify a soft upper bound for the total heap used by all RocksDB state stores on one single instance (TOTAL_OFF_HEAP_MEMORY in the sample configuration) and then specify how much of that heap is used for writing to and reading from the state stores on one single node (TOTAL_MEMTABLE_MEMORY and INDEX_FILTER_BLOCK_RATIO in the sample configuration, respectively).
Since all values are app and workload specific you need to experiment with them and monitor the RocksDB state stores with the metrics provided by Kafka Streams.
Guidance how to handle RocksDB issues in Kafka Streams can be found under:
https://www.confluent.io/blog/how-to-tune-rocksdb-kafka-streams-state-stores-performance/
Especially for your case, the following section might be interesting:
QUESTION
I am using fused location api to find the current location in the fragment, sometimes getting a memory leak
How to fix this issue?
...ANSWER
Answered 2021-May-05 at 06:54You should consider decoupling your UI from location logic.
You might wrap the location listener with LiveData to use all benefits of lifecycle callbacks instead of handling it manually.
Here is a sample project that demonstrates this technic:
https://github.com/Vicrisbeka/LocationMVVM
QUESTION
I am using leakcanary and it detects leaks in standard bottom sheet behaviour. But I can't fix this issue,
How can I fix that leak? Ref my leak canary report.
standardBottomSheetBehaviour
...ANSWER
Answered 2021-Apr-12 at 18:22You need to make standardBottomSheetBehavior
nullable then in FragmentTripPlanner.onDestroyView()
, you need to clear the reference to standardBottomSheetBehavior
since it has a reference to standardBottomSheet
QUESTION
I have zero code inside my MainActivity, only the XML layout I created and the Spinner is leaking, not sure why this is happening or how I can fix this. Does anyone know why? I'm using the LeakCanary Library
...ANSWER
Answered 2021-Apr-09 at 17:41This is a known issue in LeakCanary 2.6, which has been fixed in LeakCanary 2.7
https://square.github.io/leakcanary/changelog/#finer-grained-root-view-watching
In version 2.6, LeakCanary added detection of root views retained after View.onDetachedFromWindow(). This helps find more leaks, but unfortunately some Android widgets keep a detached root view around to reattach it later (e.g. spinner). App developers also sometimes do the same with dialogs, keeping a single instance around and calling show() and hide() as needed. As a result, LeakCanary would report leaks that were actually not leaks.
In version 2.7, the default behavior changed: LeakCanary will continue to detect leaks of toasts, but will ignore root views created by a PopupWindow (which is what Android widgets use). It will also ignore root views created by a dialog by default, and you can turn this back on by setting the leak_canary_watcher_watch_dismissed_dialogs resource boolean to true:
QUESTION
I'm currently trying to load an image using Volley's NetworkImageView:
...ANSWER
Answered 2021-Mar-30 at 12:02So, after a long search I eventually found the problem. The documentation is not really clear on this but:
QUESTION
I had install tomcat10 on my Pi 3B+ Debian full desktop Linux 32bit OS
To make the tomcat10 server successfully instal on my freshly build machine I follow the following recommended settings.
pi@Home:~ $ java -version openjdk version "11.0.9.1" 2020-11-04 OpenJDK Runtime Environment (build 11.0.9.1+1-post-Raspbian-1deb10u2) OpenJDK Server VM (build 11.0.9.1+1-post-Raspbian-1deb10u2, mixed mode)
Then download and install tomcat10 from:
wget https://downloads.apache.org/tomcat/tomcat-10/v10.0.2/bin/apache-tomcat-10.0.2.tar.gz
Change the IP address to my local IP address in both following XML files:
...Manager File: ./webapps/manager/META-INF/context.xml Host Manager File: ./webapps/host-manager/META-INF/context.xml
ANSWER
Answered 2021-Mar-09 at 23:43As I have posted this question couple of days ago but I was unable to get an answer so I decided to try a few methods of my own to see if I can resolve the problem. In my case solution, I am posting solved the above issue and I am able to connect to localhost:8080 from my browser window. I have to confess I found this solution by flook I still don't know the logic behind what made it work but it is working.
root@Home:/usr/local/tomcat10# ./bin/startup.sh
Output:
Using CATALINA_BASE: /usr/local/tomcat10 Using CATALINA_HOME: /usr/local/tomcat10 Using CATALINA_TMPDIR: /usr/local/tomcat10/temp> Using JRE_HOME: /usr/lib/jvm/java-11-oracle Using CLASSPATH: /usr/local/tomcat10/bin/bootstrap.jar:/usr/local/tomcat10/bin/tomcat->juli.jar Using CATALINA_OPTS: Tomcat started.
at this stage, I know tomcat is installed successfully and services are all up and running therefore there maybe is something wrong with the browser which may be causing a connectivity issue.
So I took the following steps:
Step No:1
I have click on three dots on the top right-hand side of the Chrome browser window (setting) then I click on more tools then click on clear browsing data.
From the Clear browsing, data window clicked the advance tab and select all times from the drop-down list
Tick all options except Password and other sign-in data and Autofill option
After your selection click the Clear data button
Open new browser window and type localhost:8080
Got unable to connect to the server message
Step NO:2
Now open the My account setting page and from here browse to My activity and clear all previously recorded activities log and turn off all active activity recording sliding switches
Web & App Activity Location History YouTube History Ad personalisation
Open the web browser and typed localhost:8080 (Enter) still got the same error message
Step NO:3 Go to add the Ad settings, I turned the Ad personalisation setting OFF in past because I didn't want Google to collect my browsing data In your case it might still be ON so I turned it back on for my browser.
now type localhost:8080 surprisingly tomcat10 index page open in my browser window To test if it was Ad setting which was stoping tomcat10 index page to load in browser window I turned Ad personalisation tab OFF again and type localhost:8080 and press Enter Even the Ad personalisation tab is OFF but this time tomcat10 index page is loaded to the browser window again.
Therefore I am not 100% sure if it was Ad personalisation state which was not allowing the tomcat10 index page to load in the browser window or one of the other previous options which I turned off
To test further I have close all my browsers and then type localhost:8080 in a new browser window and the index page still loading successfully.
This solution is working for me hope it will help other readers too
QUESTION
I'm a newbie to fixing memory leaks and I don't really understand how I should remove them, especially in custom views. In this particular case I have a custom MapLegendView, which is being used in a MapPageFragment.
MapLegendView code:
...ANSWER
Answered 2021-Mar-04 at 20:50If someone else is wondering too, as it was said in a comments section, I should have removed listeners right in the OnDetachedFromWindow() method(before the super call of it!!). Also I've cleared onClickListeners in necessary fragments and called this method for my custom view in OnDestroyView(), so now it looks like:
QUESTION
We have 2 distinct memory leaks(which look the same) in $ git clone https://source.codeaurora.org/quic/la/camera-samples -b iot-concam-apk.lnx.1.1
in version 2.0 and they go away on app close.
They occurs as soon as the app is launched. Switching tabs, again and again, does not increase the number of leaks which is a good thing I think.
I caught it using https://square.github.io/leakcanary/getting_started/ I noticed if we change all 'replace' to add in onCreate, the 2 leaks happen on Tab switch and not on the app launch.
...ANSWER
Answered 2021-Feb-13 at 08:57I have fixed the memory leak.
Not using androidx.fragment.app.FragmentContainerView
in my XML was the solution.
Instead, I have used a ConstraintLayout.
I think you should not use it if you do not control your fragment using app:navGraph="@navigation/nav_graph"
in XML and instead use replace(R.id.fragment_container, null, null)
in your activity
QUESTION
I am relatively new to the scene with little programming background, therefore I apologise in advance if I ask something silly. I am show a google map using SupportMapFragment. I am doing this to prevent a leak in onDestroyView(), however no clue whether this is right or wrong?
...ANSWER
Answered 2020-Dec-19 at 19:47The leaktrace indicates that MainActivity was destroyed but is held in memory by MapView which has the activity as its context.
Now, what's really weird here is that the MapView is the parent of a FrameLayout that has the Application as its context, which itself is the parent of a view called 'ac' (obfuscated name) which is held by a field of the "RenderDrive" thread instance.
This definitely is a bug in the Google Maps library. You should report the issue on their bug tracker, feel free to also use this answer that I just posted.
I don't know what bug exactly is causing this leak, but you could fix it by removing all children of MapView when the activity is destroyed.
QUESTION
I am trying to run the java samples of the Hyperledger Indy SDK. I have cloned the git repository of indy-sdk, built the libindy.so and use the Java Indy library version 1.15.0 (also tried with 1.14.2, 1.16.0-rc-162, same problem). I run the samples with the following command:
...ANSWER
Answered 2020-Dec-13 at 19:11The underlying code used in Indy SDK is outdated in rust lang 1.48.0+. Downgrade the rust lang version to 1.47.0 and build the indy SDK from the source will solve the issue in reference.
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