Enum CompactError 

pub enum CompactError {
    Chain(ChainError),
    NothingAcked,
    UnackedDevice {
        device_id: String,
    },
    EventStreamRetention {
        surface: String,
    },
    IntentRetention,
    TruncatedJournal {
        checkpoint_hash: String,
    },
    Io(Error),
}

A compaction failure. No PartialEq (carries io::Error); match on variants.

Variants

Chain(ChainError)

The input log doesn’t verify — never compact what you can’t trust (the B1 verify-before-fold contract).

NothingAcked

No device has acked anything: no stable frontier exists, nothing is provably folded-by-everyone, nothing may be dropped.

UnackedDevice

A device present in the log has no ack entry — its fold frontier is unknown, so every op is data it may not have seen. Refuse.

Fields

device_id: String

EventStreamRetention

The policy tried to trim an event-stream surface (op_id-keyed observation multiset). Those replay from genesis; only keep-all is sound.

Fields

surface: String

IntentRetention

The policy set a non-keep-all rule for the leased intent surface (B5). Intents are keep-all — the committed_runs idempotency oracle must survive compaction, so trimming it is never sound.

TruncatedJournal

The journal was already truncated below a checkpoint (its truncation marker names it). Re-planning from the tail alone would fold a checkpoint that silently misses everything the prior checkpoint covers — recompaction over a checkpoint base is a later slice.

Fields

checkpoint_hash: String

Io(Error)

Trait Implementations

impl Debug for CompactError

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

Formats the value using the given formatter.

impl Display for CompactError

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

Formats the value using the given formatter.

impl Error for CompactError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.