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io.UnsupportedOperation: not writable异常解决

就是这个红彤彤的异常 io.UnsupportedOperation: not writable 翻译一下,意思是不支持写入的权限。

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Hadoop 自定义writable NullPointerException

Hadoop2.2 (测试环境，不过个人感觉1.X和2.X的自定义类型应该是一致的，没做过对比)

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Hadoop源码分析：Writable接口和WritableComparable接口

1、 Writable接口由于Hadoop的MapReduce和HDFS都有通信的需求，需要对通信的对象进行序列化。Hadoop并没有采用Java的序列化，而是引入了它自己的系统。...org.apache.hadoop.io中定义了大量的可序列化对象，他们都实现了Writable接口。...1.1 Writable接口源码 package org.apache.hadoop.io; import java.io.DataOutput; import java.io.DataInput;...* */ void readFields(DataInput in) throws IOException; } 1.2 自定义Writable实现类实现了Writable接口的一个典型例子如下...，该代码实际上是在Writable接口源码的注释中。

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解决 Error: parent directory is world writable but not sticky

使用 Homebrew 安装 yarn 时遇到了 Error: parent directory is world writable but not sticky brew install yarn 报错内容如下...901b03db630ae5b508ecc153c742682c1257573cd9b12507393eac1d9bcec561--yarn-v1.17.0.tar.gz Error: parent directory is world writable...Library/Homebrew/brew.rb:102:in `' 在 Homebrew GitHub上查到的解决方案： Error: parent directory is world writable

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npm操作报错 _stream_writable.js:61

node的版本有关），无论你做什么npm的操作都会报错/usr/local/lib/node_modules/npm/node_modules/readable-stream/lib/_stream_writable.js

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Hadoop中如何正确编写继承自Writable接口的子类

Hadoop中可以编写自己的类，用作hadoop job的key或者value类型，自己编写的类要实现接口Writable。...（3）Writable中用于写出的DataOutput类型没有针对String类型的序列化方法，需要先将String类型转换成为Byte数组类型，然后在进行序列化。...import java.io.IOException; import java.io.UnsupportedEncodingException; import org.apache.hadoop.io.Writable...; /** * */ public class HttpContent implements Writable{ private byte[] content; private int

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World-writable config file ‘etcmysqlconf.dmy.cnf‘ is ignored.

文章目录 1、问题描述 2、解决方案： 1、问题描述今天用docker搭建了个mysql主从集群，但是在配置的时候出现以下警告： [Warning] World-writable config file

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Mac电脑 - 解决 brew install 报错Error: usrlocalHomebrew is not writable. 的问题

问题背景 brew install autojump Error: /usr/local/Homebrew is not writable....user account: sudo chown -R $(whoami) /usr/local/Homebrew Error: The following directories are not writable

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Hadoop阅读笔记（六）——洞悉Hadoop序列化机制Writable

我们主要对于org.apache.hadoop.conf和org.apache.hadoop.io包的部分进行一个解读，主要包含了hadoop的资源配置类Configuration、hadoop的序列化机制、Writable...三、Writable的家族体系　　Hadoop的序列化要从这个Writable接口说起。　　...Writable接口，即org.apache.hadoop.io.Writable接口，整个Hadoop的所有可序列化的对象接口都必须实现Writable接口，该接口的方法很简单，与传统的序列化类神似。...代码示例： public class MyWritable implements Writable { // Some data private int counter...FloatWritable 　　该类实现了WritableComparable、Writable、Comparable。用于Float类型的序列化。

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maybe these locations are not writable or multiple nodes were started without increasing [node.max_l

node locks, tried [[/data/elasticsearch-7.2.1/data]] with lock id [0]; maybe these locations are not writable...node locks, tried [[/data/elasticsearch-7.2.1/data]] with lock id [0]; maybe these locations are not writable

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warning insecure world writable dir ruby mode 040777，gem insstal sass error failed to build gem nati

不知道homebrew的不要问我，因为我也不知道是什么鬼。应该和忍者影分身一种鬼东西。

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MacOS上使用 react-native init 初始化项目报错Insecure world writable dir usrlocalbin in PATH, mode 040777

Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/universal-darwin21/rbconfig.rb:230: warning: Insecure world writable

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详解JavaScript之神奇的Object.defineProperty

而使用Object.defineProperty()定义的属性的属性描述符writable、enumerable和configurable默认值为false，但是都可以修改。...对于writable、enumerable和configurable的含义，从名字就不难猜中，后文也会详细介绍。...使用=赋值，等价于使用Object.defineProperty()定义时，同时将writable、enumerable和configurable设为true。...writable writable为false时，属性不能再次赋值，严格模式下会报错“Cannot assign to read only property”（如果你希望实时监控类似的应用错误的话，欢迎免费试用...writable与configurable 当writable与enumerable同时为false时，属性不能重新使用Object.defineProperty()定义，严格模式下会报错“Cannot

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JS入门难点解析13-属性描述符,数据属性和访问器属性

可写入性[[Writable]]：表示能否修改属性值。属性值[[Value]]：表示属性值。...但如果我们修改writable的值为false呢？...那么我们看看此时若将writable设置为false会有什么情况： // demo4.1.3-2 // 接demo4.1.3-1 // 第一次修改，修改前writable: true Object.defineProperty...(obj, 'a')); console.log(obj.a); 发现此时报图demo4.1.3-2所示错误，已经无法将writable: false修改回writable: true。...writable值为false，不能使用Object.defineProperty()方法改变value值； configurable值为false时，如果writable值为true，可以修改其为false

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使用Gstreamer处理RTSP视频流

Default: "rtspsrc0" parent : The parent of the object flags: readable, writable Object of...Default: false message-forward : Forwards all children messages flags: readable, writable Boolean...Default: false location : Location of the RTSP url to read flags: readable, writable String...Default: null protocols : Allowed lower transport protocols flags: readable, writable Flags...Format: [http://][user:passwd@]host[:port] flags: readable, writable String.

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阿波罗的轻语

{ value:[], writable:true }); Object.defineProperty(this, 'allBodiesLookup', { value:{}, writable:...:0, writable:true }); Object.defineProperty(this, 'y', { value:0, writable:true }); Object.defineProperty...(this, 'vx', { value:0, writable:true }); Object.defineProperty(this, 'vy', { value:0, writable...(this, 'speedBase', { value:vo.speed, writable:true }); Object.defineProperty(this, 'speed', {..., writable:true }); Object.defineProperty(this, 'parentSystem', { value:vo.parentSystem, writable

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JS面向对象

如果直接使用字面量定义对象，默认值为true [[Enumerable]] 表示该属性是否可枚举，即是否通过for-in循环或Object.keys()返回属性，如果直接使用字面量定义对象，默认值为true [[Writable...的值，现在改变writable的值也会抛出错误在对象中添加一个数据描述符属性 var person = {}; Object.defineProperty(person, 'name', {...定义为true, 则可以修改[[writable]]和[[value]]属性值,修改另外两个属性值报错 var obj = {}; Object.defineProperty(obj, 'a', {...(obj, 'a') console.log(d); // { // value: 2, // writable: false, // } 在对象中添加存取描述符属性 var obj...: true, // enumerable: true // value: 'bbb' // } Writable 当writable为false(并且configurable为true

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Writable Stream（可写流）4. 流模式(objectMode )5. 缓冲(highWa

Writable Stream（可写流）创建可写流,需要继承Writable，并实现_write()方法。 ①　上游通过调用writable.write(data)将数据写入可写流中。...// 继承Write const Writable = require('stream').Writable class ToWritable extends Writable { constructor...= new ToWritable() writable.on('finish', () => { process.stdout.write('DONE') }) writable.write(...'a') writable.write('b') writable.write('c') writable.end() ws....缓冲(highWaterMark) Writable 和 Readable 流都会将数据存储到内部的缓冲器（buffer）中。这些缓冲器可以通过相应的 writable.

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Mapreduce程序中reduce的Iterable参数迭代出是同一个对象

今天在对reduce的参数Iterable进行迭代时，发现一个问题，即Iterator的next()方法每次返回的是同一个对象，next()只是修改了Writable对象的值，而不是重新返回一个新的Writable...org.apache.hadoop.mapreduce.task.ReduceContextImpl.ValueIterator 其中next()实现时，调用的是org.apache.hadoop.io.serializer.WritableSerialization的deserialize(Writable...w)方法， Writable deserialize(Writable w) IOException { Writable writable; (w == ) { writable ... = (Writable) ReflectionUtils.(, getConf()); } { writable = w; } writable.readFields()...; writable; } 该方法只是调用了入参w的readFields方法，并没有创建新对象，除非w是null

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【英文】Node.js Streams: Everything you need to know 转载

A writable stream!...The most important events on a writable stream are: The drain event, which is a signal that the writable...Implementing a Writable Stream To implement a writable stream, we need to to use the Writable constructor...from the stream module. const { Writable } = require('stream'); We can implement a writable stream in...We can, for example, extend the Writable constructor if we want class myWritableStream extends Writable

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点击加载更多

io.UnsupportedOperation: not writable异常解决

Hadoop 自定义writable NullPointerException

Hadoop源码分析：Writable接口和WritableComparable接口

解决 Error: parent directory is world writable but not sticky

npm操作报错 _stream_writable.js:61

Hadoop中如何正确编写继承自Writable接口的子类

World-writable config file ‘etcmysqlconf.dmy.cnf‘ is ignored.

Mac电脑 - 解决 brew install 报错Error: usrlocalHomebrew is not writable. 的问题

Hadoop阅读笔记（六）——洞悉Hadoop序列化机制Writable

maybe these locations are not writable or multiple nodes were started without increasing [node.max_l

warning insecure world writable dir ruby mode 040777，gem insstal sass error failed to build gem nati

MacOS上使用 react-native init 初始化项目报错Insecure world writable dir usrlocalbin in PATH, mode 040777

详解JavaScript之神奇的Object.defineProperty

JS入门难点解析13-属性描述符,数据属性和访问器属性

使用Gstreamer处理RTSP视频流

阿波罗的轻语

JS面向对象

Writable Stream（可写流）4. 流模式(objectMode )5. 缓冲(highWa

Mapreduce程序中reduce的Iterable参数迭代出是同一个对象

【英文】Node.js Streams: Everything you need to know 转载

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