caching

问题 My use case is as follow: We have about 500 servers running in an autoscaling EC2 cluster that need to access the same configuration data (layed out in a key/value fashion) several million times per second. The configuration data isn't very large (1 or 2 GBs) and doesn't change much (a few dozen updates/deletes/inserts per minute during peak time). Latency is critical for us, so the data needs to be replicated and kept in memory on every single instance running our application. Eventual

问题 I have this Blazor SPA I have published to IIS on a webhotel. My problem is that Chrome is somehow caching my Blazor assembly so no matter how many times I redeploy I still get the old dll. I can start up a new clean Chrome with chrome --disable-application-cache --incognito and that does indeed get the fresh dll but how do I fix this properly? Kind regards 回答1: The following helps IF you don't want PWA features. I started my project with PWA (just in case I wanted it later) but it turned out

问题 I am using Spark Streaming for creating a system to enrich incoming data from a cloudant database. Example - Incoming Message: {"id" : 123} Outgoing Message: {"id" : 123, "data": "xxxxxxxxxxxxxxxxxxx"} My code for the driver class is as follows: from Sample.Job import EnrichmentJob from Sample.Job import FunctionJob import pyspark from pyspark.streaming.kafka import KafkaUtils from pyspark import SparkContext, SparkConf, SQLContext from pyspark.streaming import StreamingContext from pyspark

问题 I have a page with another html page in iframe. In this iframe, i put this header tag <META http-equiv="Pragma" content="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="-1"> <meta http-equiv="cache-control" content="no-cache" /> But chrome still cache it, when iframe content changed, hit f5 button but chrome still load cached version, not new version. Please tell me how to pevent google chrome cache this iframe. 回答1: Set the correct expiry headers in the HTTP response from your server. They

问题 I have a page with another html page in iframe. In this iframe, i put this header tag <META http-equiv="Pragma" content="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="-1"> <meta http-equiv="cache-control" content="no-cache" /> But chrome still cache it, when iframe content changed, hit f5 button but chrome still load cached version, not new version. Please tell me how to pevent google chrome cache this iframe. 回答1: Set the correct expiry headers in the HTTP response from your server. They

问题 I am new to XQuery and MarkLogic. I am trying to update documents in MarkLogic and get the extended tree cache full error. Just to get the work done I have increased the expanded tree cache but that is not recommended. I would like to tune this query so that it does not need to simultaneously cache as much XML. Here is my query I have uploaded my query as an image because it was not so pretty when I pasted it on the editor. If any one knows a better way please suggest. Thanks in advance. 回答1:

问题 I am new to XQuery and MarkLogic. I am trying to update documents in MarkLogic and get the extended tree cache full error. Just to get the work done I have increased the expanded tree cache but that is not recommended. I would like to tune this query so that it does not need to simultaneously cache as much XML. Here is my query I have uploaded my query as an image because it was not so pretty when I pasted it on the editor. If any one knows a better way please suggest. Thanks in advance. 回答1:

问题 Let's assume that variable a = 0 Processor1: a = 1 Processor2: print(a) Processor1 executes it's instruction first then in next cycle processor2 reads variable to print it. So is: processor2 gonna stall until cache coherence operation completes and it will print 1 P1: |--a=1--|---cache--coherence---|---------------- P2: ------|stalls due to coherence-|--print(a=1)---| time: -----------------------------------------------> processor2 will operate before cache coherence operation completes and

问题 I am writing a method to generate cache keys for caching function results, the key is based on a combination of function name and hash value of parameters. Currently I am using hashlib to hash the serialized version of parameters, however the operation is very expensive to serialize large objects, so what's the alternative? #get the cache key for storage def cache_get_key(*args): import hashlib serialise = [] for arg in args: serialise.append(str(arg)) key = hashlib.md5("".join(serialise))

问题 I've read about single cache-control header value. To test what I learned, I opened facebook and inspect. This is the Cache-Control response header I get: cache-control:private, no-cache, no-store, must-revalidate I am confused what this header actually tells, because it contains 4 values at once. So what happens with the resource send through the network, if it contains such header? EDIT: no-store says, "do not store at all, not in private not public caches", and no-cache says "yeees you can