titan

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https://man7.org/linux/man-pages/man2/fallocate.2.html FALLOC_FL_PUNCH_HOLE can deallocate space in the byte range starting. Within the specified range, partial filesystem blocks are zeroed, and whole filesystem blocks are removed from the file. With that,...

Connor1996

db_bench core

3

 when I run titandb_bench with --statistics, the program has a coredump. the detail is shown in the picture, it seems something wrong with statistics, and I dont modify the...

Peiqi0714

When is it compatible with RocksDB 7.5.3?

1

RocksDB 7.5.3 fixes performance degradation when Compaction occurs

zhuichao001

io_uring support?

1

saw this. not sure if titan is going to support it? https://openinx.github.io/ppt/io-uring.pdf

kolinfluence

Using File System "Punch Hole" API for GC

1

v01dstar

v01dstar

Whether titan can use the rocksdb original version or not

1

I wanna do some motifications to Titan，if I pass DBImpl's versionset to BlobGCJob, can blobGC use the rocksdb original version? Is that reasonable? Thanks!

Peiqi0714

RocksDB leverages io_uring to optimize the scan and multi-get's performance. In titan we can adopt same approach to improve the scan performance. Multi-get may not be needed for tikv scenario.

tonyxuqqi

Defaultly, LRU cache uses a policy `kFullChargeCacheMetadata` which will take memory usage of meta into account. While using it as file cache where we hope 1 file takes only 1...

wangnengjie

BlobIndex will be broken and failed to decode when zero-terminated in blob handle in compaction filter

2

https://github.com/tikv/titan/blob/ecaa9ecda94443a183e7361669ca35f8e17c6c7d/src/compaction_filter.h#L73 Slice(const char* s) will step foward util met '\0', it will broken the the blob index and DecodeFrom will be failed.

mzygQAQ