utf8.java | Vectorized UTF-8 Validation for Java | Interpreter library

by AugustNagro Java Version: Current License: No License

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | utf8.java Summary

utf8.java is a Java library typically used in Utilities, Interpreter applications. utf8.java has no bugs, it has no vulnerabilities, it has build file available and it has low support. You can download it from GitHub.

Vectorized UTF-8 validation & benchmarks, written in Java. Based on the paper by John Keiser and Daniel Lemire, with minor modifications.

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utf8.java has a low active ecosystem.

It has 19 star(s) with 2 fork(s). There are 4 watchers for this library.

It had no major release in the last 6 months.

There are 1 open issues and 1 have been closed. On average issues are closed in 7 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of utf8.java is current.

Quality

utf8.java has 0 bugs and 0 code smells.

Security

utf8.java has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

utf8.java code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

utf8.java does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

Reuse

utf8.java releases are not available. You will need to build from source code and install.

Build file is available. You can build the component from source.

Installation instructions are not available. Examples and code snippets are available.

Top functions reviewed by kandi - BETA

kandi has reviewed utf8.java and discovered the below as its top functions. This is intended to give you an instant insight into utf8.java implemented functionality, and help decide if they suit your requirements.

This method validates the internal state of the input buffer
Uses UTF - 8 checks to see if we have a few bytes .
Sets up the test scenario
Builds the byte1 high index for the given species .
Build byte vector for descending order .
Performs a vector branchy .
Computes the length of the vector in UTF - 8 .
This benchmark performs LUTS
Gets byte vector for byte1 .
Gets byte - 1 byte vector .

Get all kandi verified functions for this library.

utf8.java Key Features

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utf8.java Examples and Code Snippets

No Code Snippets are available at this moment for utf8.java.

Community Discussions

Trending Discussions on utf8.java

Flink taskmanager stucks (100% cpu usage) after failing to make a checkpoint/savepoint

Java UTF-8 Malformed Test Case is Right?

QUESTION

Flink taskmanager stucks (100% cpu usage) after failing to make a checkpoint/savepoint

Asked 2020-Sep-10 at 11:18

-- Solved problem by changing state backend from filesystem to rocksdb --

Running Flink 1.9 atop on AWS EMR. Flink app uses kinesis stream as input data and another kinesis stream as output. Recently the checkpoint size has grown to 1 gigabyte (due to more data). Sometimes, during an attempt to take a checkpoint - the application begins to utilize the entire processor resource (occurs several times a day)

Metrics:

LA (emr ec2 core node with job/task managers)

Run Loop Time - kinesis consumer

Records Per Fetch - kinesis consumer

Task manager GC

jobmanager logs

...

ANSWER

Answered 2020-Aug-28 at 09:19

I think, this might be related to the SlidingEventTimeWindow, which as far as I understand from the checkpoint screenshot is a window of size 2 minutes with a 2-second window slide. Flink creates one copy of each element per window to which it belongs. Thus, in your case for sliding window it creates about 60 copies of element and therefore the state size is 60x times bigger then for a tumbling window.

I guess, on checkpoint flink tries to serialize state and there is not enough memory therefore the GC starts and finally you run out of memory.

Source https://stackoverflow.com/questions/63621071

QUESTION

Java UTF-8 Malformed Test Case is Right?

Asked 2020-May-01 at 00:47

I am going through the JDK test code to see how they validate their UTF8.encode() works as expected since we have similar cases. Some test cases which I don't fully understand why it's invalid.

(byte)0xC0, (byte)0x80}, // invalid first byte

https://github.com/frohoff/jdk8u-jdk/blob/master/test/sun/nio/cs/TestUTF8.java#L276

the binary is 11000000 10000000 which suits the format of 2bytes utf8: 110xxxxx 10xxxxxx

(byte)0xE0, (byte)0x80, (byte)0x80 }, // U+0000 zero-padded

https://github.com/frohoff/jdk8u-jdk/blob/master/test/sun/nio/cs/TestUTF8.java#L287

Binary is 11100000 10000000 10000000 which also looks like a good 3 bytes utf8 encoded.

Can anyone help me understand it?

...

ANSWER

Answered 2020-Apr-30 at 22:50

UTF-8 requires that the shortest possible sequence be used for a codepoint.

Anything starting with 0xc0 represents a codepoint which is in the 00000 000000 – 00000 ffffff range, which is 0–63 decimal, which means it can be expressed as a single byte. In other words, any 11000000 10yyyyyy encoding is properly encoded as just 00yyyyyy.

The same goes for 0xe0 0x80 0x80.

From the UTF-8 specification:

Implementations of the decoding algorithm above MUST protect against decoding invalid sequences. For instance, a naive implementation may decode the overlong UTF-8 sequence C0 80 into the character U+0000, or the surrogate pair ED A1 8C ED BE B4 into U+233B4. Decoding invalid sequences may have security consequences or cause other problems.

Source https://stackoverflow.com/questions/61533264

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install utf8.java

You can download it from GitHub.
You can use utf8.java like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the utf8.java component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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