[erlang-questions] Why Data is needed in ets heir?

[Jesper Louis Andersen]

Hi,

When an ETS table is given away through an heir, the receiving process (of
the ETS table) receives a message of the form

{'ETS-TRANSFER',tid(),FromPid,HeirData}

The `HeirData` field allows you to send auxiliary information through to
the heir when the transfer happens. For instance some information about the
ETS table in question. Usually heir-transfer happens when a process
crashes, so you may not get a chance to send extra information through a
normal message. Furthermore, you would have to align two messages to each
other in the recevier which tend to be more complicated.


On Sun, May 21, 2017 at 1:05 PM yuzhu chen <billcyz@REDACTED> wrote:

> When setting up ets heir, I found "HeirData" is included in the heir
> option *{heir,Pid,HeirData}*, I'm confused why it is needed. Can anyone
> tell me the reason of it? Is there any direct way to setup ets heir when
> the ets table is created?
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