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new 5ec6842 Docs: Clarify PartitionSize table metric documentation
5ec6842 is described below
commit 5ec6842b3f6c9e42ed9aa12b8b138391fd5ac335
Author: Joseph Lynch <[email protected]>
AuthorDate: Wed Jan 9 17:14:34 2019 -0800
Docs: Clarify PartitionSize table metric documentation
The documentation has historically referred to (Min|Max|Mean)PartitionSize
metrics as "compacted partition size", but in practice few users know what
that means. Attempt to clarify the meaning of these metrics.
Closes #298
Patch by Joseph Lynch; Reviewed by Jeff Jirsa
---
doc/source/operating/metrics.rst | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/doc/source/operating/metrics.rst b/doc/source/operating/metrics.rst
index 4f61bf2..40a1cff 100644
--- a/doc/source/operating/metrics.rst
+++ b/doc/source/operating/metrics.rst
@@ -108,9 +108,9 @@ PendingCompactions Gauge<Integer>
Estimate of number of pen
LiveSSTableCount Gauge<Integer> Number of SSTables on
disk for this table.
LiveDiskSpaceUsed Counter Disk space used by
SSTables belonging to this table (in bytes).
TotalDiskSpaceUsed Counter Total disk space used
by SSTables belonging to this table, including obsolete ones waiting to be GC'd.
-MinPartitionSize Gauge<Long> Size of the smallest
compacted partition (in bytes).
-MaxPartitionSize Gauge<Long> Size of the largest
compacted partition (in bytes).
-MeanPartitionSize Gauge<Long> Size of the average
compacted partition (in bytes).
+MinPartitionSize Gauge<Long> Estimated minimum
uncompressed partition size in bytes for any given SSTable in this table. Note
that if there are multiple SSTables containing the same partition this metric
does not sum those sizes, it just returns the minimum. For example if there are
two SSTables containing only one (identical) partition with size 3 and 7, this
metric would show 3 instead of 10.
+MaxPartitionSize Gauge<Long> Estimated maximum
uncompressed partition size in bytes for any given SSTable in this table. Note
that if there are multiple SSTables containing the same partition this metric
does not sum those sizes, it just returns the maximum. For example if there are
two SSTables containing only one (identical) partition with size 3 and 7, this
metric would show 7 instead of 10.
+MeanPartitionSize Gauge<Long> Estimated weighted mean
uncompressed partition size in bytes across all SSTables in this table. Each
SSTable contributes an estimated mean size proportional to the estimated number
of partitions in that SSTable. For example if there are two SSTables with mean
size 2 and 300, covering 200 partitions and 3 partitions respectively, this
metric would return (2 * 200 + 300 * 3) / (200 + 3) = 6.
BloomFilterFalsePositives Gauge<Long> Number of false
positives on table's bloom filter.
BloomFilterFalseRatio Gauge<Double> False positive ratio of
table's bloom filter.
BloomFilterDiskSpaceUsed Gauge<Long> Disk space used by
bloom filter (in bytes).
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