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sdong 4a4b8a1344 sst_dump to reduce number of file reads (#6836) 
Summary:
sst_dump can issue many file reads from the file system. This doesn't work well with file systems without a OS cache, especially remote file systems. In order to mitigate this problem, several improvements are done:
1. --readahead_size is added, so that users can specify readahead size when scanning the data.
2. Force a 512KB tail readahead, which prevents three I/Os for footer, meta index and property blocks and hopefully index and filter blocks too.
3. Consoldiate SSTDump's I/Os before opening the file for read. Use the same file prefetch buffer.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6836

Test Plan: Add a test that covers this new feature.

Reviewed By: pdillinger

Differential Revision: D21516607

fbshipit-source-id: 3ae43526286f67b2f4a5bdedfbc92719d579b87e
2020-05-12 18:23:33 -07:00
..
adaptive Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
block_based sst_dump to reduce number of file reads (#6836) 2020-05-12 18:23:33 -07:00
cuckoo Pass a timeout to FileSystem for random reads (#6751) 2020-04-30 14:50:39 -07:00
plain Pass a timeout to FileSystem for random reads (#6751) 2020-04-30 14:50:39 -07:00
block_fetcher.cc Pass a timeout to FileSystem for random reads (#6751) 2020-04-30 14:50:39 -07:00
block_fetcher.h Reduce memory copies when fetching and uncompressing blocks from SST files (#6689) 2020-04-24 15:32:56 -07:00
block_fetcher_test.cc Reduce memory copies when fetching and uncompressing blocks from SST files (#6689) 2020-04-24 15:32:56 -07:00
cleanable_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
format.cc Add tests for compression failure in BlockBasedTableBuilder (#6709) 2020-05-12 09:27:35 -07:00
format.h Basic MultiGet support for partitioned filters (#6757) 2020-04-28 14:49:34 -07:00
get_context.cc Stats for redundant insertions into block cache (#6681) 2020-04-27 13:20:27 -07:00
get_context.h Stats for redundant insertions into block cache (#6681) 2020-04-27 13:20:27 -07:00
internal_iterator.h Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
iter_heap.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
iterator.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
iterator_wrapper.h Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
merger_test.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
merging_iterator.cc Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
merging_iterator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
meta_blocks.cc sst_dump to reduce number of file reads (#6836) 2020-05-12 18:23:33 -07:00
meta_blocks.h sst_dump to reduce number of file reads (#6836) 2020-05-12 18:23:33 -07:00
mock_table.cc Pass a timeout to FileSystem for random reads (#6751) 2020-04-30 14:50:39 -07:00
mock_table.h Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
multiget_context.h Basic MultiGet support for partitioned filters (#6757) 2020-04-28 14:49:34 -07:00
persistent_cache_helper.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
persistent_cache_helper.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
persistent_cache_options.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
scoped_arena_iterator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
sst_file_reader.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
sst_file_reader_test.cc Allow table/sst_file_reader_test.cc to use custom Env (#6536) 2020-03-17 11:02:13 -07:00
sst_file_writer.cc Make options.bottommost_compression, compression_opts and bottommost_compression_opts dynamically changeable. (#6615) 2020-03-31 12:11:42 -07:00
sst_file_writer_collectors.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_builder.h sst_dump to reduce number of file reads (#6836) 2020-05-12 18:23:33 -07:00
table_properties.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_properties_internal.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_reader.h Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621) 2020-04-15 17:40:44 -07:00
table_reader_bench.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_reader_caller.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
table_test.cc sst_dump to reduce number of file reads (#6836) 2020-05-12 18:23:33 -07:00
two_level_iterator.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
two_level_iterator.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00