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df59320886
This implementation is based on this design doc: https://docs.google.com/document/d/1Kppm7qL9C-BJB1j6yb6-9ObG3AbdZnFUBYPNNWwDBYM/edit?usp=sharing This commit adds support to accept out-of-order ("OOO") sample into the TSDB up to a configurable time allowance. If OOO is enabled, overlapping querying are automatically enabled. Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com> Co-authored-by: Jesus Vazquez <jesus.vazquez@grafana.com> Co-authored-by: Ganesh Vernekar <ganeshvern@gmail.com> Co-authored-by: Dieter Plaetinck <dieter@grafana.com>
75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
package tsdb
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import (
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"fmt"
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"github.com/prometheus/prometheus/tsdb/tombstones"
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)
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var _ BlockReader = &OOORangeHead{}
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// OOORangeHead allows querying Head out of order samples via BlockReader
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// interface implementation.
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type OOORangeHead struct {
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head *Head
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// mint and maxt are tracked because when a query is handled we only want
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// the timerange of the query and having preexisting pointers to the first
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// and last timestamp help with that.
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mint, maxt int64
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}
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func NewOOORangeHead(head *Head, mint, maxt int64) *OOORangeHead {
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return &OOORangeHead{
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head: head,
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mint: mint,
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maxt: maxt,
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}
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}
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func (oh *OOORangeHead) Index() (IndexReader, error) {
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return NewOOOHeadIndexReader(oh.head, oh.mint, oh.maxt), nil
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}
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func (oh *OOORangeHead) Chunks() (ChunkReader, error) {
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return NewOOOHeadChunkReader(oh.head, oh.mint, oh.maxt), nil
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}
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func (oh *OOORangeHead) Tombstones() (tombstones.Reader, error) {
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// As stated in the design doc https://docs.google.com/document/d/1Kppm7qL9C-BJB1j6yb6-9ObG3AbdZnFUBYPNNWwDBYM/edit?usp=sharing
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// Tombstones are not supported for out of order metrics.
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return tombstones.NewMemTombstones(), nil
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}
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func (oh *OOORangeHead) Meta() BlockMeta {
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var id [16]byte
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copy(id[:], "____ooo_head____")
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return BlockMeta{
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MinTime: oh.mint,
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MaxTime: oh.maxt,
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ULID: id,
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Stats: BlockStats{
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NumSeries: oh.head.NumSeries(),
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},
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}
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}
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// Size returns the size taken by the Head block.
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func (oh *OOORangeHead) Size() int64 {
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return oh.head.Size()
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}
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// String returns an human readable representation of the out of order range
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// head. It's important to keep this function in order to avoid the struct dump
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// when the head is stringified in errors or logs.
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func (oh *OOORangeHead) String() string {
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return fmt.Sprintf("ooo range head (mint: %d, maxt: %d)", oh.MinTime(), oh.MaxTime())
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}
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func (oh *OOORangeHead) MinTime() int64 {
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return oh.mint
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}
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func (oh *OOORangeHead) MaxTime() int64 {
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return oh.maxt
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}
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