Struct mz_persist::indexed::encoding::BlobTraceBatchPart

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pub struct BlobTraceBatchPart<T> {
    pub desc: Description<T>,
    pub index: u64,
    pub updates: BlobTraceUpdates,
}
Expand description

The structure serialized and stored as a value in crate::location::Blob storage for data keys corresponding to trace data.

This batch represents the data that was originally written at some time in [lower, upper) (more precisely !< lower and < upper). The individual record times may have later been advanced by compaction to something <= since. This means the ability to reconstruct the state of the collection at times < since has been lost. However, there may still be records present in the batch whose times are < since. Users iterating through updates must take care to advance records with times < since to since in order to correctly answer queries at times >= since.

Invariants:

  • The [lower, upper) interval of times in desc is non-empty.
  • The timestamp of each update is >= to desc.lower().
  • The timestamp of each update is < desc.upper() iff desc.upper() > desc.since(). Otherwise the timestamp of each update is <= desc.since().
  • The values in updates are sorted by (key, value, time).
  • The values in updates are “consolidated”, i.e. (key, value, time) is unique.
  • All entries have a non-zero diff.

TODO: disallow empty trace batch parts in the future so there is one unique way to represent an empty trace batch.

Fields§

§desc: Description<T>

Which updates are included in this batch.

There may be other parts for the batch that also contain updates within the specified [lower, upper) range.

§index: u64

Index of this part in the list of parts that form the batch.

§updates: BlobTraceUpdates

The updates themselves.

Implementations§

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impl<T: Timestamp + Codec64> BlobTraceBatchPart<T>

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pub fn validate(&self) -> Result<(), Error>

Asserts the documented invariants, returning an error if any are violated.

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pub fn encode<B>( &self, buf: &mut B, metrics: &ColumnarMetrics, cfg: &EncodingConfig, )
where B: BufMut + Send,

Encodes an BlobTraceBatchPart into the Parquet format.

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pub fn decode( buf: &SegmentedBytes, metrics: &ColumnarMetrics, ) -> Result<Self, Error>

Decodes a BlobTraceBatchPart from the Parquet format.

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pub fn key_lower(&self) -> &[u8]

Scans the part and returns a lower bound on the contained keys.

Trait Implementations§

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impl<T: Clone> Clone for BlobTraceBatchPart<T>

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fn clone(&self) -> BlobTraceBatchPart<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug> Debug for BlobTraceBatchPart<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: PartialEq> PartialEq for BlobTraceBatchPart<T>

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fn eq(&self, other: &BlobTraceBatchPart<T>) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> StructuralPartialEq for BlobTraceBatchPart<T>

Auto Trait Implementations§

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impl<T> Freeze for BlobTraceBatchPart<T>
where T: Freeze,

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impl<T> !RefUnwindSafe for BlobTraceBatchPart<T>

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impl<T> Send for BlobTraceBatchPart<T>
where T: Send,

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impl<T> Sync for BlobTraceBatchPart<T>
where T: Sync,

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impl<T> Unpin for BlobTraceBatchPart<T>
where T: Unpin,

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impl<T> !UnwindSafe for BlobTraceBatchPart<T>

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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🔬This is a nightly-only experimental API. (clone_to_uninit)
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