Summary:
We had a crash in this code: `fstat()` failed; `file_stats` contained garbage, in particular `file_stats.st_blksize == 6`; the expression `file_stats.st_blocks / (file_stats.st_blksize / 512)` divided by zero.
Closes https://github.com/facebook/rocksdb/pull/2420
Differential Revision: D5216110
Pulled By: al13n321
fbshipit-source-id: 6d8fc5e7c4f98c1139e68c7829ebdbac68b0fce0
Summary:
we align the buffer with logical sector size and should not test it with page size, which is usually 4k.
Closes https://github.com/facebook/rocksdb/pull/2245
Differential Revision: D5001842
Pulled By: lightmark
fbshipit-source-id: a7135fcf6351c6db363e8908956b1e193a4a6291
Summary:
Every time after a compaction/flush finish, we issue user reads to put the table into block cache which includes a couple of IO that read footer, index blocks, meta block, etc. So we implement Prefetch here to reduce IO.
Closes https://github.com/facebook/rocksdb/pull/2196
Differential Revision: D4931782
Pulled By: lightmark
fbshipit-source-id: 5a13d58dcab209964352322217193bbf7ff78149
Summary:
st_blocks shows 16 though the right value is 8. This happens occasionally which seems a bug.
Closes https://github.com/facebook/rocksdb/pull/2160
Differential Revision: D4893542
Pulled By: lightmark
fbshipit-source-id: 68e832586b58bbc6162efbe83ce273f1570d5be3
Summary:
filter the warning out and only print it once.
Closes https://github.com/facebook/rocksdb/pull/2137
Differential Revision: D4870925
Pulled By: lightmark
fbshipit-source-id: 91b363ce7f70bce88b0780337f408fc4649139b8
Summary:
In RocksDB, we sometimes preallocate the estimated space for a file to have better perf with fallocate (if supported). Usually it is a little bit bigger than the real resulting file size. At this time, we have to let the Filesystem reclaim the space not used.
Ideally, calling ftruncate to truncate the file to its real size should be enough. HOWEVER, it isn't on tmpfs, which we witness in our case, with some buggy kernel version. ftruncate a file with preallocated space doesn't change number of the blocks used by the file, which means the space not used by the file is not returned to the filesystems. So in this case we need fallocate with FALLOC_FL_PUNCH_HOLE to explicitly reclaim the used blocks. It is a hack to cope with the kernel bug and usually we should not need it.
Closes https://github.com/facebook/rocksdb/pull/2102
Differential Revision: D4848934
Pulled By: lightmark
fbshipit-source-id: f1b40b5
Summary:
Move some files under util/ to new directories env/, monitoring/ options/ and cache/
Closes https://github.com/facebook/rocksdb/pull/2090
Differential Revision: D4833681
Pulled By: siying
fbshipit-source-id: 2fd8bef
