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Add explanation for the 'CONFIRM' log messages

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Scott Lystig Fritchie 2016-03-09 10:53:12 -08:00
parent cd166361aa
commit 96c46ec5aa
1 changed files with 5 additions and 2 deletions
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7
doc/humming-consensus-demo.md
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@ -160,12 +160,15 @@ few seconds.
* The previous configuration used by `f2` was `upi [f2]`, i.e., `f2` * The previous configuration used by `f2` was `upi [f2]`, i.e., `f2`
was running in a chain of one. `f2` noticed that `f1` and `f3` was running in a chain of one. `f2` noticed that `f1` and `f3`
were now available and has started adding them to the chain. were now available and has started adding them to the chain.
* All new servers are always added to the tail of the chain. * All new servers are always added to the tail of the chain in the
repair list.
* In eventual consistency mode, a UPI change like this is OK. * In eventual consistency mode, a UPI change like this is OK.
* When performing a read, a client must read from both tail of the * When performing a read, a client must read from both tail of the
UPI list and also from all repairing servers. UPI list and also from all repairing servers.
* When performing a write, the client writes to both the UPI * When performing a write, the client writes to both the UPI
server list and also the repairing list, in that order. server list and also the repairing list, in that order.
* I.e., the client concatenates both lists,
`UPI ++ Repairing`, for its chain configuration for the write.
* Server `f2` will trigger file repair/re-sync shortly. * Server `f2` will trigger file repair/re-sync shortly.
* The waiting time for starting repair has been configured to be * The waiting time for starting repair has been configured to be
extremely short, 1 second. The default waiting time is 10 extremely short, 1 second. The default waiting time is 10
@ -180,7 +183,7 @@ few seconds.
Here are some suggestions for creating failures. Here are some suggestions for creating failures.
* Use the `./dev/devN/bin/machi stop` and ``./dev/devN/bin/machi start` * Use the `./dev/devN/bin/machi stop` and `./dev/devN/bin/machi start`
commands to stop & start VM #`N`. commands to stop & start VM #`N`.
* Stop a VM abnormally by using `kill`. The OS process name to look * Stop a VM abnormally by using `kill`. The OS process name to look
for is `beam.smp`. for is `beam.smp`.