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rangedesciter: carve out library for range desc iteration
Informs cockroachdb#87503; pure code-movement. Going to use it in future commits as part of multi-tenant replication reports (cockroachdb#89987) where we'll need to iterate over the set of range descriptors. Release note: None
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| load("//build/bazelutil/unused_checker:unused.bzl", "get_x_data") | ||
| load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test") | ||
|
|
||
| go_library( | ||
| name = "rangedesciter", | ||
| srcs = ["rangedesciter.go"], | ||
| importpath = "github.com/cockroachdb/cockroach/pkg/util/rangedesciter", | ||
| visibility = ["//visibility:public"], | ||
| deps = [ | ||
| "//pkg/keys", | ||
| "//pkg/kv", | ||
| "//pkg/roachpb", | ||
| "@com_github_cockroachdb_errors//:errors", | ||
| ], | ||
| ) | ||
|
|
||
| go_test( | ||
| name = "rangedesciter_test", | ||
| srcs = [ | ||
| "main_test.go", | ||
| "rangedesciter_test.go", | ||
| ], | ||
| args = ["-test.timeout=295s"], | ||
| deps = [ | ||
| ":rangedesciter", | ||
| "//pkg/keys", | ||
| "//pkg/kv/kvserver", | ||
| "//pkg/roachpb", | ||
| "//pkg/security/securityassets", | ||
| "//pkg/security/securitytest", | ||
| "//pkg/server", | ||
| "//pkg/sql/tests", | ||
| "//pkg/testutils/serverutils", | ||
| "//pkg/testutils/testcluster", | ||
| "//pkg/util/leaktest", | ||
| ], | ||
| ) | ||
|
|
||
| get_x_data(name = "get_x_data") |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| // Copyright 2022 The Cockroach Authors. | ||
| // | ||
| // Use of this software is governed by the Business Source License | ||
| // included in the file licenses/BSL.txt. | ||
| // | ||
| // As of the Change Date specified in that file, in accordance with | ||
| // the Business Source License, use of this software will be governed | ||
| // by the Apache License, Version 2.0, included in the file | ||
| // licenses/APL.txt. | ||
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|
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| package rangedesciter_test | ||
|
|
||
| import ( | ||
| "os" | ||
| "testing" | ||
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| "github.com/cockroachdb/cockroach/pkg/security/securityassets" | ||
| "github.com/cockroachdb/cockroach/pkg/security/securitytest" | ||
| "github.com/cockroachdb/cockroach/pkg/server" | ||
| "github.com/cockroachdb/cockroach/pkg/testutils/serverutils" | ||
| "github.com/cockroachdb/cockroach/pkg/testutils/testcluster" | ||
| ) | ||
|
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||
| func TestMain(m *testing.M) { | ||
| securityassets.SetLoader(securitytest.EmbeddedAssets) | ||
| serverutils.InitTestServerFactory(server.TestServerFactory) | ||
| serverutils.InitTestClusterFactory(testcluster.TestClusterFactory) | ||
| os.Exit(m.Run()) | ||
| } | ||
|
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||
| //go:generate ../../util/leaktest/add-leaktest.sh *_test.go |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| // Copyright 2022 The Cockroach Authors. | ||
| // | ||
| // Use of this software is governed by the Business Source License | ||
| // included in the file licenses/BSL.txt. | ||
| // | ||
| // As of the Change Date specified in that file, in accordance with | ||
| // the Business Source License, use of this software will be governed | ||
| // by the Apache License, Version 2.0, included in the file | ||
| // licenses/APL.txt. | ||
|
|
||
| package rangedesciter | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/cockroachdb/cockroach/pkg/keys" | ||
| "github.com/cockroachdb/cockroach/pkg/kv" | ||
| "github.com/cockroachdb/cockroach/pkg/roachpb" | ||
| "github.com/cockroachdb/errors" | ||
| ) | ||
|
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||
| // Iterator paginates through every range descriptor in the system. | ||
| type Iterator interface { | ||
| // Iterate paginates through range descriptors in the system using the given | ||
| // page size. It's important to note that the closure is being executed in | ||
| // the context of a distributed transaction that may be automatically | ||
| // retried. So something like the following is an anti-pattern: | ||
| // | ||
| // processed := 0 | ||
| // _ = rdi.Iterate(..., | ||
| // func(descriptors ...roachpb.RangeDescriptor) error { | ||
| // processed += len(descriptors) // we'll over count if retried | ||
| // log.Infof(ctx, "processed %d ranges", processed) | ||
| // }, | ||
| // ) | ||
| // | ||
| // Instead we allow callers to pass in a callback to signal on every attempt | ||
| // (including the first). This lets us salvage the example above: | ||
| // | ||
| // var processed int | ||
| // init := func() { processed = 0 } | ||
| // _ = rdi.Iterate(..., init, | ||
| // func(descriptors ...roachpb.RangeDescriptor) error { | ||
| // processed += len(descriptors) | ||
| // log.Infof(ctx, "processed %d ranges", processed) | ||
| // }, | ||
| // ) | ||
| Iterate( | ||
| ctx context.Context, pageSize int, init func(), | ||
| fn func(descriptors ...roachpb.RangeDescriptor) error, | ||
| ) error | ||
| } | ||
|
|
||
| // DB is a database handle to a CRDB cluster. | ||
| type DB interface { | ||
| Txn(ctx context.Context, retryable func(context.Context, *kv.Txn) error) error | ||
| } | ||
|
|
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| // iteratorImpl is a concrete (private) implementation of the Iterator | ||
| // interface. | ||
| type iteratorImpl struct { | ||
| db DB | ||
| } | ||
|
|
||
| // New returns an Iterator. | ||
| func New(db DB) Iterator { | ||
| return &iteratorImpl{db: db} | ||
| } | ||
|
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| var _ Iterator = &iteratorImpl{} | ||
|
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| // Iterate implements the Iterator interface. | ||
| func (i *iteratorImpl) Iterate( | ||
| ctx context.Context, | ||
| pageSize int, | ||
| init func(), | ||
| fn func(descriptors ...roachpb.RangeDescriptor) error, | ||
| ) error { | ||
| return i.db.Txn(ctx, func(ctx context.Context, txn *kv.Txn) error { | ||
| // Inform the caller that we're starting a fresh attempt to page in | ||
| // range descriptors. | ||
| init() | ||
|
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| // Iterate through meta{1,2} to pull out all the range descriptors. | ||
| var lastRangeIDInMeta1 roachpb.RangeID | ||
| return txn.Iterate(ctx, keys.MetaMin, keys.MetaMax, pageSize, | ||
| func(rows []kv.KeyValue) error { | ||
| descriptors := make([]roachpb.RangeDescriptor, 0, len(rows)) | ||
| var desc roachpb.RangeDescriptor | ||
| for _, row := range rows { | ||
| err := row.ValueProto(&desc) | ||
| if err != nil { | ||
| return errors.Wrapf(err, "unable to unmarshal range descriptor from %s", row.Key) | ||
| } | ||
|
|
||
| // In small enough clusters it's possible for the same range | ||
| // descriptor to be stored in both meta1 and meta2. This | ||
| // happens when some range spans both the meta and the user | ||
| // keyspace. Consider when r1 is [/Min, | ||
| // /System/NodeLiveness); we'll store the range descriptor | ||
| // in both /Meta2/<r1.EndKey> and in /Meta1/KeyMax[1]. | ||
| // | ||
| // As part of iterator we'll de-duplicate this descriptor | ||
| // away by checking whether we've seen it before in meta1. | ||
| // Since we're scanning over the meta range in sorted | ||
| // order, it's enough to check against the last range | ||
| // descriptor we've seen in meta1. | ||
| // | ||
| // [1]: See kvserver.rangeAddressing. | ||
| if desc.RangeID == lastRangeIDInMeta1 { | ||
| continue | ||
| } | ||
|
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| descriptors = append(descriptors, desc) | ||
| if keys.InMeta1(keys.RangeMetaKey(desc.StartKey)) { | ||
| lastRangeIDInMeta1 = desc.RangeID | ||
| } | ||
| } | ||
|
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||
| // Invoke fn with the current chunk (of size ~blockSize) of | ||
| // range descriptors. | ||
| return fn(descriptors...) | ||
| }) | ||
| }) | ||
| } |
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