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814aad65f1
This PR adds another trimming strategy to XADD and XTRIM named MINID (complements the existing MAXLEN). It also adds a new LIMIT argument that allows incremental trimming by repeated calls (rather than all at once). This provides the ability to trim all records older than a certain ID (which makes it possible for the user to trim by age too). Example: XTRIM mystream MINID ~ 1608540753 will trim entries with id < 1608540753, but might not trim all (because of the ~ modifier) The purpose is to ease the use of streams. many users use streams as logs and the common case is wanting a log of the last X seconds rather than a log that contains maximum X entries (new MINID vs existing MAXLEN) The new LIMIT modifier is only supported when the trim strategy uses ~. i.e. when the user asked for exact trimming, it all happens in one go (no possibility for incremental trimming). However, when ~ is provided, we trim full rax nodes, up to the limit number of records. The default limit is 100*stream_node_max_entries (used when LIMIT is not provided). I.e. this is a behavior change (even if the existing MAXLEN strategy is used). An explicit limit of 0 means unlimited (but note that it's not the default). Other changes: Refactor arg parsing code for XADD and XTRIM to use common code. |
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