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[improve] [bk] Update the document of diskUsageWarnThreshold #21142

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Sep 14, 2023
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[improve] [bk] Update the document of diskUsageWarnThreshold #21142

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29 changes: 16 additions & 13 deletions conf/bookkeeper.conf
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Original file line number Diff line number Diff line change
Expand Up @@ -608,27 +608,30 @@ readOnlyModeEnabled=true

# For each ledger dir, maximum disk space which can be used.
# Default is 0.95f. i.e. 95% of disk can be used at most after which nothing will
# be written to that partition. If all ledger dir partitions are full, then bookie
# be written to that partition. If all ledger dir partions are full, then bookie
# will turn to readonly mode if 'readOnlyModeEnabled=true' is set, else it will
# shutdown.
# Valid values should be in between 0 and 1 (exclusive).
diskUsageThreshold=0.95

# The disk free space low water mark threshold.
# Disk is considered full when usage threshold is exceeded.
# Disk returns back to non-full state when usage is below low water mark threshold.
# This prevents it from going back and forth between these states frequently
# when concurrent writes and compaction are happening. This also prevent bookie from
# switching frequently between read-only and read-writes states in the same cases.
# diskUsageWarnThreshold=0.95
# shutdown. Bookie will also suspend the minor and major compaction when usage threshold is exceed
# if `isForceGCAllowWhenNoSpace` is disabled. When the usage becomes lower than the threshold, the major and minor
# compaction will be resumed.
# Valid values should be in between 0 and 1 (exclusive). The default value is 0.95.
# diskUsageThreshold=0.95

# The disk free space warn threshold.
# Disk is considered almost full when usage threshold is exceeded. Bookie will suspend the major
# compaction when usage threshold is exceed if `isForceGCAllowWhenNoSpace` is disabled. When the usage becomes lower
# than the threshold, the major compaction will be resumed. The default value is 0.90.
# diskUsageWarnThreshold=0.90

# Set the disk free space low water mark threshold. Disk is considered full when
# usage threshold is exceeded. Disk returns back to non-full state when usage is
# below low water mark threshold. This prevents it from going back and forth
# between these states frequently when concurrent writes and compaction are
# happening. This also prevent bookie from switching frequently between
# read-only and read-writes states in the same cases.
# diskUsageLwmThreshold=0.90
# If the bookie already runs into read-only mode and the disk usage becomes lower than this threshold, the bookie
# will change from read-only to read-write mode. At the same time, the major and minor compaction will be resumed
# if `isForceGCAllowWhenNoSpace` is disabled. The default value is the same with `diskUsageThreshold`.
# diskUsageLwmThreshold=0.95

# Disk check interval in milli seconds, interval to check the ledger dirs usage.
# Default is 10000
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