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prepare to read from multiple file chunks

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This commit is contained in:
Chris Lu 2018-05-23 22:28:54 -07:00
parent 849b6ec28d
commit 00d0274fd7
2 changed files with 157 additions and 4 deletions
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21
weed/filer2/filechunks.go
View file

@ -52,6 +52,27 @@ func FindUnusedFileChunks(oldChunks, newChunks []*filer_pb.FileChunk) (unused []
return return
} }
func ReadFromChunks(chunks []*filer_pb.FileChunk, offset int64, size int) (views []*filer_pb.FileChunk) {
visibles := nonOverlappingVisibleIntervals(chunks)
stop := offset + int64(size)
for _, chunk := range visibles {
if chunk.start <= offset && offset < chunk.stop {
views = append(views, &filer_pb.FileChunk{
FileId: chunk.fileId,
Offset: offset - chunk.start, // offset is the data starting location in this file id
Size: uint64(min(chunk.stop, stop) - offset),
})
offset = min(chunk.stop, stop)
}
}
return views
}
func logPrintf(name string, visibles []*visibleInterval) { func logPrintf(name string, visibles []*visibleInterval) {
return return

132
weed/filer2/filechunks_test.go
View file

@ -144,3 +144,135 @@ func TestIntervalMerging(t *testing.T) {
} }
} }
func TestChunksReading(t *testing.T) {
testcases := []struct {
Chunks []*filer_pb.FileChunk
Offset int64
Size int
Expected []*filer_pb.FileChunk
}{
// case 0: normal
{
Chunks: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
{Offset: 100, Size: 100, FileId: "asdf", Mtime: 134},
{Offset: 200, Size: 100, FileId: "fsad", Mtime: 353},
},
Offset: 0,
Size: 250,
Expected: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc"},
{Offset: 0, Size: 100, FileId: "asdf"},
{Offset: 0, Size: 50, FileId: "fsad"},
},
},
// case 1: updates overwrite full chunks
{
Chunks: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
{Offset: 0, Size: 200, FileId: "asdf", Mtime: 134},
},
Offset: 50,
Size: 100,
Expected: []*filer_pb.FileChunk{
{Offset: 50, Size: 100, FileId: "asdf"},
},
},
// case 2: updates overwrite part of previous chunks
{
Chunks: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
{Offset: 0, Size: 50, FileId: "asdf", Mtime: 134},
},
Offset: 25,
Size: 50,
Expected: []*filer_pb.FileChunk{
{Offset: 25, Size: 25, FileId: "asdf"},
{Offset: 0, Size: 25, FileId: "abc"},
},
},
// case 3: updates overwrite full chunks
{
Chunks: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
{Offset: 0, Size: 200, FileId: "asdf", Mtime: 134},
{Offset: 50, Size: 250, FileId: "xxxx", Mtime: 154},
},
Offset: 0,
Size: 200,
Expected: []*filer_pb.FileChunk{
{Offset: 0, Size: 50, FileId: "asdf"},
{Offset: 0, Size: 150, FileId: "xxxx"},
},
},
// case 4: updates far away from prev chunks
{
Chunks: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
{Offset: 0, Size: 200, FileId: "asdf", Mtime: 134},
{Offset: 250, Size: 250, FileId: "xxxx", Mtime: 154},
},
Offset: 0,
Size: 400,
Expected: []*filer_pb.FileChunk{
{Offset: 0, Size: 200, FileId: "asdf"},
// {Offset: 0, Size: 150, FileId: "xxxx"}, // missing intervals should not happen
},
},
// case 5: updates overwrite full chunks
{
Chunks: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
{Offset: 0, Size: 200, FileId: "asdf", Mtime: 184},
{Offset: 70, Size: 150, FileId: "abc", Mtime: 143},
{Offset: 80, Size: 100, FileId: "xxxx", Mtime: 134},
},
Offset: 0,
Size: 220,
Expected: []*filer_pb.FileChunk{
{Offset: 0, Size: 200, FileId: "asdf"},
{Offset: 0, Size: 20, FileId: "abc"},
},
},
// case 6: same updates
{
Chunks: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
{Offset: 0, Size: 100, FileId: "abc", Mtime: 123},
},
Offset: 0,
Size: 100,
Expected: []*filer_pb.FileChunk{
{Offset: 0, Size: 100, FileId: "abc"},
},
},
}
for i, testcase := range testcases {
log.Printf("++++++++++ read test case %d ++++++++++++++++++++", i)
chunks := ReadFromChunks(testcase.Chunks, testcase.Offset, testcase.Size)
for x, chunk := range chunks {
log.Printf("read case %d, chunk %d, offset=%d, size=%d, fileId=%s",
i, x, chunk.Offset, chunk.Size, chunk.FileId)
if chunk.Offset != testcase.Expected[x].Offset {
t.Fatalf("failed on read case %d, chunk %d, Offset %d, expect %d",
i, x, chunk.Offset, testcase.Expected[x].Offset)
}
if chunk.Size != testcase.Expected[x].Size {
t.Fatalf("failed on read case %d, chunk %d, Size %d, expect %d",
i, x, chunk.Size, testcase.Expected[x].Size)
}
if chunk.FileId != testcase.Expected[x].FileId {
t.Fatalf("failed on read case %d, chunk %d, FileId %s, expect %s",
i, x, chunk.FileId, testcase.Expected[x].FileId)
}
}
if len(chunks) != len(testcase.Expected) {
t.Fatalf("failed to read test case %d, len %d expected %d", i, len(chunks), len(testcase.Expected))
}
}
}