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646c3588de
Background compaction can create an unbounded number of leveldb::RandomAccessFile instances. On 64-bit systems mmap is used and file descriptors are only used beyond a certain number of mmap's. 32-bit systems to not use mmap at all. leveldb::RandomAccessFile does not observe Options.max_open_files so compaction could exhaust the file descriptor limit. This change uses getrlimit to determine the maximum number of open files and limits RandomAccessFile to approximately 20% of that value. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=143505556
29 lines
896 B
C++
29 lines
896 B
C++
// Copyright 2017 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef STORAGE_LEVELDB_UTIL_ENV_POSIX_TEST_HELPER_H_
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#define STORAGE_LEVELDB_UTIL_ENV_POSIX_TEST_HELPER_H_
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namespace leveldb {
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class EnvPosixTest;
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// A helper for the POSIX Env to facilitate testing.
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class EnvPosixTestHelper {
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private:
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friend class EnvPosixTest;
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// Set the maximum number of read-only files that will be opened.
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// Must be called before creating an Env.
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static void SetReadOnlyFDLimit(int limit);
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// Set the maximum number of read-only files that will be mapped via mmap.
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// Must be called before creating an Env.
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static void SetReadOnlyMMapLimit(int limit);
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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_UTIL_ENV_POSIX_TEST_HELPER_H_
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