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$ gpg2 --full-gen-key
gpg (GnuPG) 2.2.4; Copyright (C) 2017 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Please select what kind of key you want:
   (1) RSA and RSA (default)
   (2) DSA and Elgamal
   (3) DSA (sign only)
   (4) RSA (sign only)
Your selection? 1
Note: Enter 1 here
RSA keys may be between 1024 and 4096 bits long.
What keysize do you want? (2048) 4096
Note: Enter 4096 here
Requested keysize is 4096 bits
Please specify how long the key should be valid.
         0 = key does not expire
      <n>  = key expires in n days
      <n>w = key expires in n weeks
      <n>m = key expires in n months
      <n>y = key expires in n years
Key is valid for? (0) 0
Note: Enter 0 here
Key does not expire at all
Is this correct? (y/N) y
Note: Enter y here
GnuPG needs to construct a user ID to identify your key.

Real name: your name
Note: Enter your name here
Email address: someone@apache.org
Note: Enter your email here
Comment: Apache IoTDB release signing key
Note: enter some comments here
You selected this USER-ID:
    "your name (Apache IoTDB release signing key) <someone@apache.org>"

Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O
Note: Enter O here
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.
We need to generate a lot of random bytes. It is a good idea to perform
some other action (type on the keyboard, move the mouse, utilize the
disks) during the prime generation; this gives the random number
generator a better chance to gain enough entropy.

$ gpg2 --edit-key A string of numbers just now
gpg (GnuPG) 2.2.4; Copyright (C) 2017 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Secret key is available.

gpg: checking the trustdb
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: depth: 0  valid:   2  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 2u
gpg: next trustdb check due at 2020-01-30
sec  rsa4096/2206EF8F64C35889
     created: 2019-09-25  expires: never       usage: SC
     trust: ultimate      validity: ultimate
ssb  rsa4096/2C8DBF57147E3901
     created: 2019-09-25  expires: never       usage: E
[ultimate] (1). your name (Apache IoTDB release signing key) <someone@apache.org>

gpg> showpref
Enter showpref here
[ultimate] (1). your name (Apache IoTDB release signing key) <someone@apache.org>
     Cipher: AES256, AES192, AES, 3DES
     Digest: SHA512, SHA384, SHA256, SHA224, SHA1
     Compression: ZLIB, BZIP2, ZIP, Uncompressed
     Features: MDC, Keyserver no-modify

If the order is different, you can adjust
gpg> setpref SHA512 SHA384 SHA256 SHA224 SHA1 AES256 AES192 AES 3DES ZLIB BZIP2 ZIP Uncompressed
Here, enter the three values ​​of Digest Cipher Compression in order