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Update options.h

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Siying Dong 2022-05-03 11:07:29 -07:00 committed by GitHub
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commit f78e7672d1
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include/rocksdb/options.h
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@ -767,6 +767,14 @@ struct DBOptions {
// Allow the OS to mmap file for reading sst tables.
// Not recommended for 32-bit OS.
// When the option is set to true and compression is disabled, the blocks
// will not be copied and will be read directly from the mmaped memory
// area, and the block will not be inserted into the block cache. However,
// checksums will still be checked if ReadOptions.verify_checksums is set
// to be true. It means a checksum check every time a block is read, more
// than the setup where the option is set to false and the block cache is
// used. The common use of the options is to run RocksDB on ramfs, where
// checksum verification is usually not needed.
// Default: false
bool allow_mmap_reads = false;