Yiran Wang

Switch tracker to use in memory cache instead of redis

3

Trackers don't need to share data anyway. Switching to in-memory cache should improve tracker performance.

**Describe the bug** https://travis-ci.com/uber/kraken/jobs/262868501 **To Reproduce** Travis CI unit test. **Log** ``` goroutine 0 [idle]: runtime.futex(0x12126e8, 0x80, 0x0, 0x0, 0x7ffc00000000, 0x0, 0x0, 0x0, 0x7ffca57cee48, 0x433881, ...) /home/travis/.gimme/versions/go1.12.13.linux.amd64/src/runtime/sys_linux_amd64.s:535 +0x21 runtime.futexsleep(0x12126e8, 0x100000000,...

**Is your feature request related to a problem? Please describe.** Today cleanup logic is mostly configured through TTL. During traffic peak, origin could take much more space than desired, and...

**Describe the bug** TestPreheat fails occasionally.

**Is your feature request related to a problem? Please describe.** GOPATH is deprecated. **Describe the solution you'd like** Remove all references of GOPATH in makefile

Might need some changes like https://github.com/uber/makisu/pull/223

Make devcluster work on Linux machines

1

Right now devcluster only work with Docker-for-Mac. We should make it work on Linux machines as well.