My current settings are:
mds advanced mds_beacon_grace 15.000000
True. I might as well remove it completely, it's an artefact of earlier
experiments.
This should be a global setting. It is used by the mons and mdss.
mds basic mds_cache_memory_limit 4294967296
mds advanced mds_cache_trim_threshold 393216
global advanced mds_export_ephemeral_distributed true
mds advanced mds_recall_global_max_decay_threshold 393216
mds advanced mds_recall_max_caps 30000
mds advanced mds_recall_max_decay_threshold 98304
mds advanced mds_recall_warning_threshold 196608
global advanced mon_compact_on_start true
I haven't had any noticeable slow downs or crashes in a while with 3
active MDS and 3 hot standbys.
Thanks for sharing the settings that worked for you.
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