I would use 8 if I have max_write_buffer_number set to 8 as each write_buffer will have it's own WAL. If max_write_buffer_number is 1 I would use recycle_log_file_num=1. RocksDB tuning can get somewhat complex, see: https://github.com/facebook/rocksdb/wiki/RocksDB-Tuning-Guide On Sat, Jun 20, 2020 at 12:55 PM Seena Fallah <seenafallah@xxxxxxxxx> wrote: > > Do you have any reason for this value? :)) > > On Sat, Jun 20, 2020 at 9:24 PM Frank R <frankaritchie@xxxxxxxxx> wrote: >> >> With ceph I have always used it to set the number of WALs to recycle, >> ie to recycle 8 WALs I use: >> >> " >> recycle_log_file_num=8 >> " >> >> On Sat, Jun 20, 2020 at 12:47 PM Seena Fallah <seenafallah@xxxxxxxxx> wrote: >> > >> > Yes here I found it’s a boolean (= true) >> > Will this true convert to 1? >> > >> > On Sat, Jun 20, 2020 at 9:15 PM Frank R <frankaritchie@xxxxxxxxx> wrote: >> >> >> >> also see: >> >> >> >> https://github.com/facebook/rocksdb/wiki/WAL-Performance >> >> >> >> " >> >> Options.recycle_log_file_num = true will keep a pool of WAL files and >> >> try to reuse them. When writing to an existing log file, random writes >> >> are used from size 0. Before writes hit the end of the file, the file >> >> size doesn't change, so the I/O for metadata might be avoided (also >> >> depends on file system mount options). Assuming most WAL files will >> >> have similar sizes, I/O needed for metadata will be minimal. >> >> " >> >> >> >> On Sat, Jun 20, 2020 at 12:43 PM Frank R <frankaritchie@xxxxxxxxx> wrote: >> >> > >> >> > I believe it is the number of WALs that should be reused and should be >> >> > equal to write_buffer_number but don't quote me. >> >> > >> >> > On Sat, Jun 20, 2020 at 11:35 AM Seena Fallah <seenafallah@xxxxxxxxx> wrote: >> >> > > >> >> > > Hi. I found a default rocksdb option in bluestore that I can't find in >> >> > > facebook rocksdb. >> >> > > recycle_log_file_num this config if a boolean config in facebook >> >> > > rocksdb but in default Ceph configs the value of this is 4. >> >> > > Can someone tell what it means? >> >> > > _______________________________________________ >> >> > > ceph-users mailing list -- ceph-users@xxxxxxx >> >> > > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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