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fae4229ff2
Summary: Add the beginnings of an eden gc command. Today it's equivalent to `eden debug clear_local_caches` followed by `eden debug_compact_local_storage`, except that it compacts each column as they're cleared to minimize peak disk consumption. Eventually, it will also unload in-memory inodes, flush data from the overlay, and clear the kernel's VFS cache too. Reviewed By: wez Differential Revision: D9138305 fbshipit-source-id: b303a63f601014cf38ca94c9e6f7c04394159ea8
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#pragma once
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#include <folly/Synchronized.h>
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#include <folly/experimental/StringKeyedUnorderedMap.h>
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#include "eden/fs/store/LocalStore.h"
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namespace facebook {
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namespace eden {
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/** An implementation of LocalStore that stores values in memory.
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* Stored values remain in memory for the lifetime of the
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* MemoryLocalStore instance.
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* MemoryLocalStore is thread safe, allowing concurrent reads and
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* writes from any thread.
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* */
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class MemoryLocalStore : public LocalStore {
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public:
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MemoryLocalStore();
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void close() override;
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void clearKeySpace(KeySpace keySpace) override;
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void compactKeySpace(KeySpace keySpace) override;
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StoreResult get(LocalStore::KeySpace keySpace, folly::ByteRange key)
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const override;
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bool hasKey(LocalStore::KeySpace keySpace, folly::ByteRange key)
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const override;
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void put(
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LocalStore::KeySpace keySpace,
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folly::ByteRange key,
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folly::ByteRange value) override;
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std::unique_ptr<LocalStore::WriteBatch> beginWrite(
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size_t bufSize = 0) override;
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private:
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folly::Synchronized<std::vector<folly::StringKeyedUnorderedMap<std::string>>>
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storage_;
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};
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} // namespace eden
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} // namespace facebook
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