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9944a5dff5
Summary:
* This adds a `EdenServer::recover()` method to start back up on unsuccessful takeover data send.
* On an unsuccessful ping, filfill the `shutdownPromise` with a `TakeoverSendError` continaing the constructed `TakeoverData`. After this `recover` function is called, `takeoverPromise_` is reset, `takeoverShutdown` is set to `false`, and the `runningState_` is set to `RUNNING`.
With taking over from the returned `TakeoverData`, the user will not encounter `Transport not connected` errors on recovery.
* This adds a `EdenServer::closeStorage()` method to defer closing the `backingStore_` and `localStore_` until after our ready handshake is successful.
* This defers the shutdown of the `PrivHelper` until a successful ready handshake.
I also update the takeover documentation here with the new logic (and fix some formatting issues)
Reviewed By: simpkins
Differential Revision: D20433433
fbshipit-source-id: f59e660922674d281957e80aee5049735b901a2c
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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namespace folly {
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template <typename T>
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class Future;
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}
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namespace facebook {
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namespace eden {
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class TakeoverData;
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/**
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* TakeoverHandler is a pure virtual interface for classes that want to
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* implement graceful takeover functionality.
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*
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* This is primarily implemented by the EdenServer class. However, there are
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* also alternative implementations used for unit testing.
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*/
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class TakeoverHandler {
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public:
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virtual ~TakeoverHandler() {}
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/**
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* startTakeoverShutdown() will be called when a graceful shutdown has been
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* requested, with a remote process attempting to take over the currently
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* running mount points.
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*
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* This should return a Future that will produce the TakeoverData to send to
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* the remote edenfs process once this edenfs process is ready to transfer
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* its mounts.
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*/
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virtual folly::Future<TakeoverData> startTakeoverShutdown() = 0;
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virtual void closeStorage() = 0;
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};
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} // namespace eden
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} // namespace facebook
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