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Use FSRandomRWFilePtr Object to call underlying file system. (faceboo…
…k#7198) Summary: Replace FSRandomRWFile pointer with FSRandomRWFilePtr object in the rocksdb internal code. This new object wraps FSRandomRWFile pointer. Objective: If tracing is enabled, FSRandomRWFile object returns FSRandomRWFileTracingWrapper pointer that includes all necessary information in IORecord and calls underlying FileSystem and invokes IOTracer to dump that record in a binary file. If tracing is disabled then, underlying FileSystem pointer is returned directly. FSRandomRWFilePtr wrapper class is added to bypass the FSRandomRWFileWrapper when tracing is disabled. Pull Request resolved: facebook#7198 Test Plan: make check -j64 Reviewed By: anand1976 Differential Revision: D23421116 Pulled By: akankshamahajan15 fbshipit-source-id: 8a5ba0e7d9c1ba34c3a6f29829b107c5f09ab6a3
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