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Posted to issues@ozone.apache.org by GitBox <gi...@apache.org> on 2019/11/08 11:06:30 UTC
[GitHub] [hadoop-ozone] adoroszlai opened a new pull request #132:
HDDS-2445. Replace ToStringBuilder in BlockData
adoroszlai opened a new pull request #132: HDDS-2445. Replace ToStringBuilder in BlockData
URL: https://github.com/apache/hadoop-ozone/pull/132
## What changes were proposed in this pull request?
Eliminate `ToStringBuilder` from `BlockData`. Use a single `StringBuilder` to collect parts of the final result.
Also avoid stream-processing in `setChunks` for the special cases of 0 or 1 elements.
https://issues.apache.org/jira/browse/HDDS-2445
## How was this patch tested?
Added benchmark with various implementations.
```
bin/ozone genesis -benchmark BenchmarkBlockDataToString
```
Normalized GC allocation rates are below (absolute values are not important, only relative to one another). Using a single string builder saves ~78% of allocations compared to the current implementation (`ToStringBuilderDefaultCapacity`).
```
Benchmark (capacity) (count) Mode Cnt Score Error Units
PushDownStringBuilder 112 1000 thrpt 20 503403.364 ± 6.593 B/op
InlineStringBuilder 112 1000 thrpt 20 503625.761 ± 2.665 B/op
SimpleStringBuilder 112 1000 thrpt 20 1133643.831 ± 4.051 B/op
ToStringBuilder 112 1000 thrpt 20 1429626.864 ± 7.415 B/op
Concatenation 112 1000 thrpt 20 1523808.749 ± 13.819 B/op
ToStringBuilderDefaultCapacity 112 1000 thrpt 20 2229699.096 ± 6.739 B/op
```
Added a simple unit test to verify the output is unchanged.
Stream-processing change is verified by existing `TestBlockData#testSetChunks`.
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