Only link fd* files during source-only snapshot#53463
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ywelsch merged 6 commits intoelastic:masterfrom Mar 23, 2020
Merged
Only link fd* files during source-only snapshot#53463ywelsch merged 6 commits intoelastic:masterfrom
ywelsch merged 6 commits intoelastic:masterfrom
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Pinging @elastic/es-distributed (:Distributed/Snapshot/Restore) |
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@ywelsch FYI, checkstyle randomness: |
original-brownbear
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Mar 20, 2020
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Nice! Thanks @ywelsch LGTM :) just some random+optional NITS
x-pack/plugin/core/src/main/java/org/elasticsearch/snapshots/SourceOnlySnapshot.java
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Source-only snapshots currently create a second full source-only copy of the shard on disk to support incrementality during upload. Given that stored fields are occupying a substantial part of a shard's storage, this means that clusters with source-only snapshots can require up to 50% more local storage. Ideally we would only generate source-only parts of the shard for the things that need to be uploaded (i.e. do incrementality checks on original file instead of trimmed-down source-only versions), but that requires much bigger changes to the snapshot infrastructure. This here is an attempt to dramatically cut down on the storage used by the source-only copy of the shard by soft-linking the stored-fields files (fd*) instead of copying them. Relates #50231
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Source-only snapshots currently create a second full source-only copy of the shard on disk to support incrementality during upload. Given that stored fields are occupying a substantial part of a shard's storage, this means that clusters with source-only snapshots can require up to 50% more local storage. Ideally we would only generate source-only parts of the shard for the things that need to be uploaded (i.e. do incrementality checks on original file instead of trimmed-down source-only versions), but that requires much bigger changes to the snapshot infrastructure. This here is an attempt to dramatically cut down on the storage used by the source-only copy of the shard by soft-linking the stored-fields files (fd*) instead of copying them.
Relates #50231