I have heard that JDK 11 introduces a new garbage collector strategy named ZGC, but I cannot find what this stands for. What does the letter "Z" mean? Does it have any specific meaning?
What exactly does the letter "Z" refer to in the name ZGC in JDK11?
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It's just a name with no deeper meaning.
When naming ZGC they were inspired by / wanted to pay homage to Oracle's Bonwick's filesystem ZFS.
Bonwick explains the meaning of "Z" in ZFS in his Blog. He tried to come up with a good name and finally decided on something with "FS". Looking through AFS-ZFS it turned out that all were being used, but ZFS not so much. From (2):
Next he wanted to come up with something "Z" could stand for and possible candidates were "Zero" or "Zetta" (but the he'd have to explain what Zetta means) and then (2):
And since the "Z" in ZFS doesn't stand for anything, so does now the "Z" in ZGC.
Sources:
Additional information: The FAQ also informs us that you are free to pronounce it "zed gee see" or "zee gee see".