Github user laurentgo commented on the issue:
https://github.com/apache/drill/pull/858
As for System.currentTimeMillis(), maybe not as expensive as you think: if
I remember correctly, it's a JVM intrinsic (no JNI cost), and if mapped to
gettimeofday (which I believe is the case), it's a VSDO function on Linux,
which means it's pretty cheap (no user/kernel context change). Compared to
creating threads, and waiting on conditions, should be way cheaper.
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