• Chaos mesh — let application dance with chaos on kubernetes


    Author: Yin Chengwen On December 31, 2019, we officially open source chaos mesh on GitHub. As a cloud native chaos test platform, chaos mesh provides the ability to test chaos on kubernetes platform. This article will introduce the origin and principle of chaos mesh, and lead us to explore the world of chaos testing with […]

  • Minicluster is not yet running


    1. Run the main function with Flink and read Kafka data for hundreds of collect() operations Exception in thread “main” java.util.concurrent.ExecutionException: org.apache.flink.client.program.ProgramInvocationException: Job failed (JobID: a32030ab2b07573214af69c8e3f8205b) at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357) at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895) at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1640) at org.apache.flink.streaming.api.environment.LocalStreamEnvironment.execute(LocalStreamEnvironment.java:74) at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1620) at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.java:1602) at org.apache.flink.streaming.api.scala.StreamExecutionEnvironment.execute(StreamExecutionEnvironment.scala:667) at com.streamingkmeans.StreamingKMeansFromKafkaTest$.main(StreamingKMeansFromKafkaTest.scala:39) at com.streamingkmeans.StreamingKMeansFromKafkaTest.main(StreamingKMeansFromKafkaTest.scala) Caused by: org.apache.flink.client.program.ProgramInvocationException: Job failed (JobID: a32030ab2b07573214af69c8e3f8205b) at org.apache.flink.client.deployment.ClusterClientJobClientAdapter.lambda$null$6(ClusterClientJobClientAdapter.java:112) at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:602) […]

  • Internal server error is prompted when link submit new job


    1. Submit the jar package to the Flink Web UI, and always have errorsServer Response Message:Internal server error.2. Go to the Flink / log directory for troubleshooting cat flink-zytshijack-standalonesession-0-bogon.log Error prompt class not found3. Confirm that the running class in jar is correctUsing the WinRAR tool to view the jar package, we found that the […]

  • Solution to startup error of easynvr video streaming media server (2)


    We have talked about the reasons why the video streaming server easynvr fails to start up successfully: the solution to the problems such as the installation failure of the streaming media server / the program startup error. Of course, there are other situations, such as the situation we will talk about next. When starting easynvr […]

  • Global navigation satellite systems (GNSS)


    In essence, the high-precision global positioning system can be regarded as a cascaded positioning system. Firstly, a possible location range is provided by GNSS system, and then the local environment is searched and matched by using lidar system and visual positioning system, so as to achieve centimeter level positioning accuracy. Because GNSS needs to provide […]

  • OSD kill succeeded for process


    Environment: Oracle 12.2 single RAC + RedHat 6.9 Em13c error: At / home / u01 / APP / Oracle / diag / RDBMS / DB6 / db61 / Alert/ log.xml Operation error (OSD kill success…): Sun Mar 15 23:23:40 2020 / 67198. alert log: 2020-03-15T23:23:40.022325+08:00Process 0x0x403c7de50 appears to be hung in Auto SQL Tuning taskCurrent […]

  • Solve the problem of setting state error when the react component is unmounted


    1. Error occurred:2. Causes of errorsGenerally, the react component has been removed from the DOM, but some asynchronous operations we have done in the component have not finished, such as interface call. When it is completed, the set state operation is executed. At this time, we have removed the component from the DOM, resulting in […]

  • [transfer]: xmake v2.0.3 update


    Update content New features Add header file dependency auto detection and incremental compilation to improve compilation speed Color highlight prompt in the terminal Add debugger support,xmake run -d program … improvement Enhance the serial interface of running shell Update luajit to v2.0.4 Improve makefile generation plug-in, remove the dependence on xmake, and supportwindows/linux/macosxAnd most PC […]

  • PageHelper paging query home page data is not correct


    Environmental Science Mybaits,PageHelper,Oracle1 11g Error description The total number of current page 1 is 25, and each page has 10 items. As a result, there are only 7 pages in the first page and only 18 pages in the databaseThe second and third pages are normalThe background also found 10 pieces of data 11:11:37.890 [http-nio-8080-exec-16] […]

  • HTTP status code details


    HTTP status codes can be divided into five categories Start with 1: information status code Start with 2: success status code Start with 3: redirection status code Start with 4: client error status code Start with 5: server error status code 1XX: information status code Status code meaning describe 100 continue The initial request has […]

  • Summary of red error in react


    React red error summary 1、 Uncaught typeerror: cannot read property ‘value’ of undefined Unknown type error: cannot read undefined property ‘value’ My source code: console.log(item.controlAttributeObj.placeholder.value) Error reason: The initial value of controlattributeobj is {}, so for the first time, the placeholder is undefined. Undefined has no attribute, so the value attribute cannot be obtained at […]

  • Solution to an error message no subject alternative names present in JDK security certificate


    When I use java to consume a restful API of a website, I encounter this error: 21:31:16.383 [main] DEBUG org.springframework.web.client.RestTemplate – Created GET request for “”21:31:16.388 [main] DEBUG org.springframework.web.client.RestTemplate – Setting request Accept header to [text/plain, application/json, application/+json, /*]Exception in thread “main” org.springframework.web.client.ResourceAccessException: I/O error on GET request for “”: java.security.cert.CertificateException: No subject alternative names […]