针对sqoop:【error】ERRORtool.ImportTool:Importfailed:java.io.IOException:Filesystemclosed这个问题，本篇文章进行了详细的

针对sqoop:【error】ERROR tool.ImportTool: Import failed: java.io.IOException: Filesystem closed这个问题，本篇文章进行了详细的解答，同时本文还将给你拓展Attempted import error: ‘echarts‘ does not contain a default export (imported as ‘echarts‘).、bitMapToFile ERR: java.io.FileNotFoundException: /storage/emulated/0/image.jpg: open failed: EPERM (Operation not allowed) in android、Composer\Downloader\TransportException ... Failed to enable crypto，failed to open stream: operati...、error: (-215:Assertion failed) !_src.empty() in function ''cv::cvtColor''等相关知识，希望可以帮助到你。

• sqoop:【error】ERROR tool.ImportTool: Import failed: java.io.IOException: Filesystem closed
• Attempted import error: ‘echarts‘ does not contain a default export (imported as ‘echarts‘).
• bitMapToFile ERR: java.io.FileNotFoundException: /storage/emulated/0/image.jpg: open failed: EPERM (Operation not allowed) in android
• Composer\Downloader\TransportException ... Failed to enable crypto，failed to open stream: operati...
• error: (-215:Assertion failed) !_src.empty() in function ''cv::cvtColor''

sqoop:【error】ERROR tool.ImportTool: Import failed: java.io.IOException: Filesystem closed

19/06/06 12:04:08 ERROR tool.ImportTool: Import failed: java.io.IOException: Filesystem closed
        at org.apache.hadoop.hdfs.DFSClient.checkOpen(DFSClient.java:808)
        at org.apache.hadoop.hdfs.DFSClient.delete(DFSClient.java:2041)
        at org.apache.hadoop.hdfs.DistributedFileSystem$14.doCall(DistributedFileSystem.java:707)
        at org.apache.hadoop.hdfs.DistributedFileSystem$14.doCall(DistributedFileSystem.java:703)
        at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
        at org.apache.hadoop.hdfs.DistributedFileSystem.delete(DistributedFileSystem.java:703)
        at org.apache.hadoop.mapreduce.JobSubmitter.submitJobInternal(JobSubmitter.java:251)
        at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1290)
        at org.apache.hadoop.mapreduce.Job$10.run(Job.java:1287)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1698)
        at org.apache.hadoop.mapreduce.Job.submit(Job.java:1287)
        at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1308)
        at org.apache.sqoop.mapreduce.ImportJobBase.doSubmitJob(ImportJobBase.java:200)
        at org.apache.sqoop.mapreduce.ImportJobBase.runJob(ImportJobBase.java:173)
        at org.apache.sqoop.mapreduce.ImportJobBase.runImport(ImportJobBase.java:270)
        at org.apache.sqoop.manager.SqlManager.importTable(SqlManager.java:692)
        at org.apache.sqoop.manager.MySQLManager.importTable(MySQLManager.java:127)
        at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:520)
        at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:628)
        at org.apache.sqoop.Sqoop.run(Sqoop.java:147)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:183)
        at org.apache.sqoop.Sqoop.runTool(Sqoop.java:234)
        at org.apache.sqoop.Sqoop.runTool(Sqoop.java:243)
        at org.apache.sqoop.Sqoop.main(Sqoop.java:252)

原因：

多个 datanode 在 getFileSystem 过程中，由于 Configuration 一样，会得到同一个 FileSystem。如果有一个 datanode 在使用完关闭连接，其它的 datanode 在访问就会出现上述异常

解决办法：

       在 core-site.xml 中添加如下内容：

<property>
     <name>fs.hdfs.impl.disable.cache</name>
     <value>true</value>
</property>

Attempted import error: ‘echarts‘ does not contain a default export (imported as ‘echarts‘).

今天做项目时遇到这个问题，没有搞懂是什么原因，看了一下json文件，发现echarts版本更新了，以前装的一直是4.9.0 ， 不支持i新版本？

方法一：很大可能是echarts-for-react不支持echarts最新版本，于是装了一下旧版本，惊奇的发现可以了！！
指令：npm install echarts@4.9.0
然后再 npm start一下就可以啦。

方法二：朋友说改变引用方式也行， 这种方法我没试，不想等安装过程的孩子可以试试~
把import方式 改成：var echarts = require(‘echarts’);
如果要用import，就这样：import * as echarts from ‘echarts’

新手上路，记录错误，不完全准确，欢迎指正

bitMapToFile ERR: java.io.FileNotFoundException: /storage/emulated/0/image.jpg: open failed: EPERM (Operation not allowed) in android

class ImageProcess {

    companion object {
        fun bitmapToFile(imageBitmap: Bitmap,filename: String): File? {
            val sd = Environment.getExternalStorageDirectory()
            val dest = File(sd,filename)

            try {
                val out = FileOutputStream(dest) //problem
                imageBitmap.compress(Bitmap.CompressFormat.PNG,100,out)
                out.flush()
                out.close()
            } catch (e: Exception) {
                e.printstacktrace()
            }

            return dest

        }
    }

}

W/System.err: java.io.FileNotFoundException: /storage/emulated/0/image.jpg: open Failed: EPERM (Operation not permitted)
        at libcore.io.IoBridge.open(IoBridge.java:492)
W/System.err:     at java.io.FileOutputStream.<init>(FileOutputStream.java:236)

<application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:requestLegacyExternalStorage="true"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.TestFirst"
        android:usesCleartextTraffic="true">

[Composer\Downloader\TransportException] 
The "https://packagist.laravel-china.org/packages.json" file could not be downloaded: Peer certificate CN=`*.phphub.org'' did not match expected CN=`packagist.laravel-china.org''
Failed to enable crypto 
failed to open stream: operation failed

[Composer\Downloader\TransportException]
  Content-Length mismatch, received 3444 bytes out of the expected 299952