[Kraken] - Improve performance of checksum computation #4999
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The original code is compiling a Regex in a loop which is inefficient in an active system. What I'm seeing is that most of the time, I/O threads spend on this Pattern compilation.
nioEventLoopGroup-18-1" #76 [85] prio=10 os_prio=0 cpu=78812.80ms elapsed=7034.36s tid=0x00007f4404302110 nid=85 runnable [0x00007f44746ce000] java.lang.Thread.State: RUNNABLE at java.util.regex.Pattern$CharProperty.study([email protected]/Pattern.java:4119) at java.util.regex.Pattern$Start.<init>([email protected]/Pattern.java:3777) at java.util.regex.Pattern.compile([email protected]/Pattern.java:1967) at java.util.regex.Pattern.<init>([email protected]/Pattern.java:1576) at java.util.regex.Pattern.compile([email protected]/Pattern.java:1101) at java.lang.String.replaceFirst([email protected]/String.java:3025) at info.bitrich.xchangestream.kraken.KrakenStreamingChecksum$1.load(KrakenStreamingChecksum.java:27) at info.bitrich.xchangestream.kraken.KrakenStreamingChecksum$1.load(KrakenStreamingChecksum.java:21) at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3574) at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2316) at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2190) - locked <0x00000000eaa1d588> (a com.google.common.cache.LocalCache$StrongAccessEntry) at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2080) at com.google.common.cache.LocalCache.get(LocalCache.java:4017) at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4040) at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4989) at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4996) at info.bitrich.xchangestream.kraken.KrakenStreamingChecksum.addBigDecimalToCrcString(KrakenStreamingChecksum.java:34) at info.bitrich.xchangestream.kraken.KrakenStreamingChecksum.addOrderToCrcString(KrakenStreamingChecksum.java:38) at info.bitrich.xchangestream.kraken.KrakenStreamingChecksum.lambda$createCrcString$1(KrakenStreamingChecksum.java:49) at info.bitrich.xchangestream.kraken.KrakenStreamingChecksum$$Lambda/0x00007f4478cf79a8.accept(Unknown Source) at java.util.stream.ForEachOps$ForEachOp$OfRef.accept([email protected]/ForEachOps.java:184) at java.util.stream.SliceOps$1$1.accept([email protected]/SliceOps.java:200) at java.util.TreeMap$KeySpliterator.tryAdvance([email protected]/TreeMap.java:3123) at java.util.stream.ReferencePipeline.forEachWithCancel([email protected]/ReferencePipeline.java:129) at java.util.stream.AbstractPipeline.copyIntoWithCancel([email protected]/AbstractPipeline.java:527) at java.util.stream.AbstractPipeline.copyInto([email protected]/AbstractPipeline.java:513) at java.util.stream.AbstractPipeline.wrapAndCopyInto([email protected]/AbstractPipeline.java:499) at java.util.stream.ForEachOps$ForEachOp.evaluateSequential([email protected]/ForEachOps.java:151) at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential([email protected]/ForEachOps.java:174) at java.util.stream.AbstractPipeline.evaluate([email protected]/AbstractPipeline.java:234) at java.util.stream.ReferencePipeline.forEach([email protected]/ReferencePipeline.java:596) at info.bitrich.xchangestream.kraken.KrakenStreamingChecksum.createCrcString(KrakenStreamingChecksum.java:49) at info.bitrich.xchangestream.kraken.KrakenStreamingChecksum.createCrcChecksum(KrakenStreamingChecksum.java:60) at info.bitrich.xchangestream.kraken.KrakenStreamingAdapters.adaptOrderbookMessage(KrakenStreamingAdapters.java:103) at info.bitrich.xchangestream.kraken.KrakenStreamingMarketDataService.lambda$getOrderBook$0(KrakenStreamingMarketDataService.java:52)