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Added metric for symbol table size

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Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>
This commit is contained in:
Ganesh Vernekar 2018-09-08 23:58:36 +05:30
parent eeb3a7435a
commit 77d2c7cf3d
No known key found for this signature in database
GPG key ID: 0241A11211763456
2 changed files with 41 additions and 5 deletions
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31
block.go
View file

@ -15,6 +15,7 @@
package tsdb
import (
"encoding/binary"
"encoding/json"
"io/ioutil"
"os"
@ -248,6 +249,10 @@ type Block struct {
dir string
meta BlockMeta
// Symbol Table Size in bytes.
// We maintain this variable to avoid recalculation everytime.
symbolTableSize uint64
chunkr ChunkReader
indexr IndexReader
tombstones TombstoneReader
@ -275,12 +280,23 @@ func OpenBlock(dir string, pool chunkenc.Pool) (*Block, error) {
return nil, err
}
// Calculating symbol table size.
tmp := make([]byte, 8)
symTblSize := uint64(0)
for _, v := range ir.SymbolTable() {
// Size of varint length of the symbol.
symTblSize += uint64(binary.PutUvarint(tmp, uint64(len(v))))
// Size of the symbol.
symTblSize += uint64(len(v))
}
pb := &Block{
dir: dir,
meta: *meta,
chunkr: cr,
indexr: ir,
tombstones: tr,
dir: dir,
meta: *meta,
chunkr: cr,
indexr: ir,
tombstones: tr,
symbolTableSize: symTblSize,
}
return pb, nil
}
@ -350,6 +366,11 @@ func (pb *Block) Tombstones() (TombstoneReader, error) {
return blockTombstoneReader{TombstoneReader: pb.tombstones, b: pb}, nil
}
// GetSymbolTableSize returns the Symbol Table Size in the index of this block.
func (pb *Block) GetSymbolTableSize() uint64 {
return pb.symbolTableSize
}
func (pb *Block) setCompactionFailed() error {
pb.meta.Compaction.Failed = true
return writeMetaFile(pb.dir, &pb.meta)

15
db.go
View file

@ -119,6 +119,7 @@ type DB struct {
type dbMetrics struct {
loadedBlocks prometheus.GaugeFunc
symbolTableSize prometheus.GaugeFunc
reloads prometheus.Counter
reloadsFailed prometheus.Counter
compactionsTriggered prometheus.Counter
@ -138,6 +139,19 @@ func newDBMetrics(db *DB, r prometheus.Registerer) *dbMetrics {
defer db.mtx.RUnlock()
return float64(len(db.blocks))
})
m.symbolTableSize = prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Name: "prometheus_tsdb_symbol_table_size",
Help: "Size of symbol table on disk (in bytes)",
}, func() float64 {
db.mtx.RLock()
blocks := db.blocks[:]
db.mtx.RUnlock()
symTblSize := float64(0)
for _, b := range blocks {
symTblSize += float64(b.GetSymbolTableSize())
}
return symTblSize
})
m.reloads = prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_reloads_total",
Help: "Number of times the database reloaded block data from disk.",
@ -166,6 +180,7 @@ func newDBMetrics(db *DB, r prometheus.Registerer) *dbMetrics {
if r != nil {
r.MustRegister(
m.loadedBlocks,
m.symbolTableSize,
m.reloads,
m.reloadsFailed,
m.cutoffs,