Add a Downsampling writer that drop a percentage of spans#1353

Merged

yurishkuro merged 20 commits intojaegertracing:masterfrom guanw:judew-auto-drop-index

Mar 12, 2019

+423-9

Commits on Mar 11, 2019

adding a wrapping writer that automatic drop spans before writing with predefined config
Jude Wang
committed
updating comment
Jude Wang
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hash traceID for downsampling and code refactoring
Jude Wang
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adding DownSamplingOptions
Jude Wang
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address yuri's comments
Jude Wang
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committing benchmark file & adding metrics
Jude Wang
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address comment from Won
Jude Wang
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get rid of defer; benchmark sync.Pool for byte array; make sure 100% code coverage
Jude Wang
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making sure sync.Pool benchmark with 0 allocations
Jude Wang
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refactor to read ratio and hashsalt from CLI
Jude Wang
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address yuri comments
Jude Wang
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refinement
Jude Wang
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fix merge conflict
Jude Wang
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copy hashSalt slice inside bytePool initialization
Jude Wang
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further comments from yuri
Jude Wang
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omit error check for MarshalTo
Jude Wang
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update naming and some logic
Jude Wang
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remove pointer
Jude Wang
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updating tests
Jude Wang
committed

Commits on Mar 12, 2019

adding default salt
Jude Wang
committed