Programmer Group

>Following the previous article "Apache Shiro takes over the authentication and authorization of Swagger", some enthusiastic netizens said that Apache Shiro seems too simple. In response to this problem, the individual does not make any evaluation (all technologies serve the needs). Today's main share is: how to take over the authe ...

Built a set of elk by myself 7.x Version environment found that using filebeat to collect nginx or apapche could not customize the directory log directory. If you customize the log directory, it would not be segmented. If you use the default log location, it would be segmented The solution is hereby recorded Default load path [root@kangcw e ...

Purchase domain name. Example: example.com Set multiple secondary domain names. As shown in the figure:   To configure the tomcat file: Modify the server.xml File: The following configuration configures three containers with three different ports. Please note three points: ① port number: Connector port; ② container name: portservice ...

As a qualified programmer, how to make the code more concise and clear, and improve the coding speed. Today, follow me to learn the application of java 8 stream. Don't talk much nonsense, go straight to the point. Considering the following business scenario, there are four personnel information, and we need to count the names of personnel accor ...

brief introduction Before JDK11, the HTTP function of java was very weak, only HttpURLConnection was provided for HTTP connection, and it was very complex to use. So we usually use the third-party HTTP client (Apache HttpComponents or OkHttp) to make HTTP requests. Everything has changed in JDK11. In the java.net.http package, the latest HttpCl ...

Today, when testing phoenix's secondary index function, the following exception occurred when the index was created to write data: Caused by: org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException: Failed 1 action: org.apache.phoenix.hbase.index.builder.IndexBuildingFailureException: Failed to build index for unexpected reason! ...

mq cluster construction I haven't written these technical articles for a while. I'll spare some time to write them today, or I'll forget them This article records the process of building rocketmq cluster, and it's also a half day's achievement record! Interested friends like to go! Well, there's not much bullshit. Let's start. This article i ...

                   . Catalog 1, Hadoop source compilation supports Snappy compression 1.1 resource preparation 1.2 jar package installation 1.3 compiling source code 2, Hadoop compression configuration 2 ...

Hbase API create table error record Demo method: import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.HColumnDescriptor; import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.TableName; import org.apache.hadoop.hbase.client.Admin; import ...

Most of the statements on the Internet are "if there is a transaction, the current transaction is supported.". Open if no transaction " It's just a silly face... My understanding at the beginning is that if the save method is called, a transaction will be opened when the transaction is executed to userMapper.save. At this time ...