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https://github.com/featurebasedb/featurebase.git
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63fb2f8539
We might have a problem with a stale mmap, and to try to narrow it down a bit, we add some sanity-checking features and panic recovery to the generation Transaction code. This is pretty experimental.
67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
// Copyright 2020 Pilosa Corp.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// +build generationparanoia
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package pilosa
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import (
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"runtime"
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"testing"
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"unsafe"
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)
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func TestGenerationPanic(t *testing.T) {
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f := mustOpenFragment("i", "f", viewStandard, 0, "none")
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defer f.Clean(t)
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for i := 0; i < f.MaxOpN; i++ {
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_, _ = f.setBit(0, uint64(i*32))
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}
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// force snapshot so we get a mmapped row...
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_ = f.Snapshot()
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_ = f.row(0)
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var prevData []byte
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if f.gen.(*mmapGeneration).data == nil {
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t.Fatalf("generation code didn't create a mapping, apparently?")
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}
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prevData = f.gen.(*mmapGeneration).data
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f.mu.Lock()
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_ = f.snapshotQueue.Immediate(f)
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f.mu.Unlock()
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runtime.GC()
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for i := 0; i < (f.MaxOpN / 2); i++ {
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_, _ = f.setBit(0, uint64(i*32)+23)
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}
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f.mu.Lock()
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f.snapshotQueue.Await(f)
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f.mu.Unlock()
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runtime.GC()
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newData := f.gen.(*mmapGeneration).data
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if unsafe.Pointer(&prevData[0]) == unsafe.Pointer(&newData[0]) {
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t.Fatalf("test can't run usefully, didn't get new data pointer")
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}
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err := f.gen.Transaction(&f.storage.OpWriter, func() error {
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prevData[0] = 0x3c
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return nil
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})
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if err == nil {
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t.Fatalf("expected a panic to get caught, but nothing happened")
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}
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if err.Error() != "invalid memory access during transaction" {
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t.Fatalf("expected \"invalid memory access during transaction\", got %q", err.Error())
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}
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}
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