Seaweedfs Erasure-coding Introduction https://github.com/seaweedfs/seaweedfs/wiki/Erasure-coding-for-warm-storage SeaweedFS implements RS(10,4), which allows 4 blocks to be lost out of every 10 hard disks and can still be accessed normally. It saves 3.6 times the disk space compared to copying data 5 times to achieve the same robustness. Service startup Start the master server, 4 volume servers, and a […]
Tag: erasure
ceph source code reading erasure-code
1. ceph erasure code Erasure code is a popular data redundancy storage method. The original data is divided into k data chunks, and m coding chunks are calculated from the k data chunks. Save n=k + m data blocks in different nodes, and restore the original data through any k blocks in n. EC contains […]
ceph source code reading erasure-code
1. ceph erasure code Erasure code is a popular data redundant storage method. The original data is divided into k data chunks, and m coding chunks are calculated from the k data chunks. Save n=k + m data blocks in different nodes, and restore the original data through any k blocks in n. EC contains […]
Feign encountered generic type erasure during serialization, causing it to become a LinkedHashMap during deserialization.
Feign encountered generic type erasure during serialization, causing it to become a LinkedHashMap during deserialization Failure background problem analysis Fix Fix 1: Avoid using generics Fix 2: Process when parsing data generics Fault background Suppose we have a Feign interface import org.springframework.cloud.openfeign.FeignClient; import org.springframework.cloud.openfeign.SpringQueryMap; import org.springframework.http.MediaType; import org.springframework.web.bind.annotation.PostMapping; @FeignClient(name = “testJdkDateTimeRpcService”, url = “${query-current-service-provider.prevBaseUrl}”) public […]
could not be determined automatically, due to type erasure. You can give type information hints by u
Flink executes the program and reports an error: /Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/bin/java -javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=51984:/Applications/IntelliJ IDEA.app/Contents/bin -Dfile.encoding=UTF-8 -classpath /Libr ary/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_ 301.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre /lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library /Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8 .0_301.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.j dk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/jce. jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/j 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Explain generic erasure? Why does java have to force?
1. Overview: Before explaining what generic erasure is, we must first understand what Java generics are. The so-called generic is a parameterized type. This means that we can pass concrete types as a parameter to methods, classes, and interfaces. Why do we need generics? First of all, we all know that in java, Object is […]
How fabric integrates the implementation of RS erasure code through java
Fabric is a distributed ledger platform that provides an easy way to build blockchain applications. If you want to use RS erasure code in fabric, you can follow the steps below to integrate: First, a new chaincode (chaincode) needs to be defined in the fabric to implement the logic of the RS erasure code. Chaincode […]
Data Structure | Generics | Erasure Mechanisms | Upper Bounds of Generics
Directory ?edit 1. Generics 1.1 The Object class leads to the concept of generics 2. Generic syntax 2.1 Generic writing code 3. Generic mechanism 3.1 Erase Mechanism 4. The upper bound of generics 4.1 Syntax of generic upper bounds 4.2 The use of generic upper bounds 5. Generic methods 5.1 Generic method syntax 5.2 Use […]
JAVA types (Type), generics and type erasure
Table of Contents JAVA type (Type) system 1. History of the Type System 2. Custom tool method 3. Various Types Parameterized type: ParameterizedType getRawType(): Type getOwnerType(): Type getActualTypeArguments(): Type[ ] GenericArrayType: Generic array type TypeVariable: type variable WildcardType: wildcard type new method for new type Generics and type erasure There are children (Class) first, and […]