The NameNode detects this condition by the absence of a Heartbeat message. The NameNode marks DataNodes without recent Heartbeats as dead and does not forward any new IO requests to them.
Namenode通过心跳包的缺失检测到这一情况，并将这些Datanode标记为dead，不会将新的IO请求发给它们。
All change is not growth, as all movement is not forward.
并非所有的变化都是增长，就像不是所有的运动都在向前进。
Do not forward this email directly.
本邮件请勿直接转发。
In this state, the bridge does not forward frames and does not learn of network MAC addresses.
在这个状态下，网桥不能转发帧和学习网内MAC地址。
I would not forward it, unless I feared the worst.
我不能发出去，除非真的出现最糟糕的事情。
Then slowly he began to walk, not forward or backward, but in the same place, in the center of the log.
他开始慢慢走动，但并没有向前或向后，而是在圆木中间走动。
P. S - Do not forward this email back to me, I am closing my email account & going to sell tomatoes! ! !
另外，各位不要把这封邮件再回复给我，因为我已经关了邮箱去卖西红柿了！！！
The readings, the PPT and the video are for your individual use only. Do not forward or distribute to anyone.
讲座材料，PPT和录像视频仅供个人使用，请勿转发或传播。
Selecting the Do Not Forward option for your email message makes the message private between you and the intended recipient.
勾选“禁止转发”后，你发送的邮件就变成了你和收件人之间的私有信件。
Selecting the Do Not Forward option for your E-mail message makes the message private between you and the intended recipient.
勾选“禁止转发”后，你发送的邮件就变成了你和收件人之间的私有信件。
Selecting the Do Not Forward option for your E-mail message makes the message private between you and the intended recipient.
勾选“禁止转发”后，你发送的邮件就变成了你和收件人之间的私有信件。
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