Comments (10)
from titan.
Interesting finding. I misunderstood what bottom-pri mean. I thought it's kind of a lowest-pri threadpool where bottommost level will use the normal low-pri pool if the bottom-pri pool is fully utilized.
from titan.
@yiwu-arbug How about using Priority::USER
instead for Titan GC?
from titan.
Seems we can leverage the bottom-pri pool to reduce the write stall possibility when level-merge/range-merge enabled. See facebook/rocksdb#3835
Also, I'm curious how you find this problem. As expected, we will disable Titan background GC when level-merge enabled.
from titan.
Also, I'm curious how you find this problem. As expected, we will disable Titan background GC when level-merge enabled.
Because I found max_background_gc will influence space amplification significanttly (very!) even if BackgroundGCCall is bypassed by level_merge, same as actual size ratio among LSM-Tree levels.
from titan.
@yiwu-arbug How about using
Priority::USER
instead for Titan GC?
I have tried, I think it's ok.
from titan.
@yiwu-arbug How about using
Priority::USER
instead for Titan GC?
Let's do that for now.
from titan.
Because I found max_background_gc will influence space amplification significantly (very!) even if BackgroundGCCall is bypassed by level_merge, same as actual size ratio among LSM-Tree levels.
Wait a minute. When Titan background GC is disabled, the BOTTOM is not set no matter what's the value of max_background_gc
. why it will influence still?
from titan.
Because I found max_background_gc will influence space amplification significantly (very!) even if BackgroundGCCall is bypassed by level_merge, same as actual size ratio among LSM-Tree levels.
Wait a minute. When Titan background GC is disabled, the BOTTOM is not set no matter what's the value of
max_background_gc
. why it will influence still?
we did not disable GC, just bypassed MaybeScheduleGC() call after compactoin.
from titan.
oh, so you didn't set disable_background_gc
explicitly. got it.
from titan.
Related Issues (20)
- blob file_level_ in blobfilemeta HOT 1
- GC in level_merge HOT 6
- db_bench core HOT 3
- io_read && io_write HOT 1
- parameter file_size is always 0 HOT 1
- Question about `TitanDBImpl::GetOldestSnapshotSequence()` HOT 2
- bug: key in compaction filter is internal key instead of userkey after apply IsStackedBlobDbInternalCompactionFilter HOT 9
- Any compact mechanism on titan's manifest file ? HOT 1
- Lazy load value in iterator HOT 1
- Blob file is left untouched in fallback mode HOT 3
- Store BlobStorage pointer in ColumnFamilyHandle
- Why titan forcibly set total_order_seek to true ? HOT 5
- File Size Not Really Used in GC HOT 1
- Leverage file system hole punching to avoid GC rewrite
- LRU cache misuse for BlobFileCache causes significant performance degradation HOT 3
- Whether titan can use the rocksdb original version or not HOT 1
- mirror the RocksDB's async IO optimization to titan in scan
- Wrong config when use DB::open without cf configs HOT 2
- BlobIndex will be broken and failed to decode when zero-terminated in blob handle in compaction filter HOT 2
- rate-limiter not limit the blobstorage read in compaction filter HOT 6
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from titan.