klion26 commented on a change in pull request #8622:
[FLINK-12438][doc-zh]Translate Task Lifecycle document into Chinese
URL: https://github.com/apache/flink/pull/8622#discussion_r297044835
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File path: docs/internals/task_lifecycle.zh.md
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@@ -23,172 +23,97 @@ specific language governing permissions and limitations
under the License.
-->
-A task in Flink is the basic unit of execution. It is the place where each
parallel instance of an operator is executed
-As an example, an operator with a parallelism of *5* will have each of its
instances executed by a separate task.
+Task 是 Flink 的基本执行单元。算子的每个并行实例都是在 task 里执行的。举个例子，一个并行度为 5 的算子，它的每个实例都由一个单独的
task 来执行。
-The `StreamTask` is the base for all different task sub-types in Flink's
streaming engine. This document goes through
-the different phases in the lifecycle of the `StreamTask` and describes the
main methods representing each of these
-phases.
+在 Flink 流式计算引擎里，`StreamTask` 是所有不同子类型 task 的基础。这篇文档会深入 `StreamTask`
生命周期的不同阶段，介绍每个阶段的主要方法。
* This will be replaced by the TOC
{:toc}
-## Operator Lifecycle in a nutshell
+## 算子生命周期简介
-Because the task is the entity that executes a parallel instance of an
operator, its lifecycle is tightly integrated
-with that of an operator. So, we will briefly mention the basic methods
representing the lifecycle of an operator before
-diving into those of the `StreamTask` itself. The list is presented below in
the order that each of the methods is called.
-Given that an operator can have a user-defined function (*UDF*), below each of
the operator methods we also present
-(indented) the methods in the lifecycle of the UDF that it calls. These
methods are available if your operator extends
-the `AbstractUdfStreamOperator`, which is the basic class for all operators
that execute UDFs.
+因为 task 是算子并行实例的执行实体，所以它的生命周期跟算子的生命周期紧紧联系到一起。因此，在深入介绍 `StreamTask`
生命周期之前，先简要介绍一下代表算子生命周期的各个基本方法。这些方法列表按调用的先后顺序排列如下所示。考虑到算子可能有用户自定义函数(*UDF*)，我们也提到了
UDF 生命周期里调用的各个方法。如果你的算子继承了 `AbstractUdfStreamOperator`
的话，这些方法都是可用的，`AbstractUdfStreamOperator` 是所有继承 UDF 算子的基类。
- // initialization phase
+ // 初始化阶段
OPERATOR::setup
- UDF::setRuntimeContext
+ UDF::setRuntimeContext
OPERATOR::initializeState
OPERATOR::open
- UDF::open
+ UDF::open
- // processing phase (called on every element/watermark)
+ // 调用处理阶段（通过每条数据或 watermark 来调用）
OPERATOR::processElement
- UDF::run
+ UDF::run
OPERATOR::processWatermark
- // checkpointing phase (called asynchronously on every checkpoint)
+ // checkpointing 阶段（通过每个 checkpoint 异步调用）
Review comment:
```suggestion
// checkpointing 阶段（每次 checkpoint 时异步调用）
```
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