david 42b03db2fa Immutable blocks with mmap reads ...

Flush sealed head chunks to ULID-named block directories on disk. Each
block contains CRC'd chunk segment files (mmap'd for reads), a binary
index (symbol table, series, postings with TOC), and a meta.json written
last as the immutability gate. WAL is truncated after block fsync,
preserving the crash-safety ording invariant.

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..

appender.go

In-memory head with WAL

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head_test.go

Immutable blocks with mmap reads

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head.go

Immutable blocks with mmap reads

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series.go

In-memory head with WAL

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striped.go

Immutable blocks with mmap reads

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