Support global workers for commit and append #136
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* Each Raft instance creates at least two threads: one for commit and the other one for append. If there is a use case that a process has many Raft instances, it will produce lots of threads that end up with inefficient resource utilization. * To address this issue, we introduce a global thread pool; there are shared worker threads for commit and append, and a global manager coordinates requests from multiple Raft instances and assigns them to proper worker threads.
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Each Raft instance creates at least two threads: one for commit and
the other one for append. If there is a use case that a process has
many Raft instances, it will produce lots of threads which end up with
resource efficiency problem.
To address this issue, we introduce a global thread pool; there are
shared worker threads for commit and append, and a global manager
coordinates requests from multiple Raft instances and assigns them
to proper worker threads.