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add note on latency spikes

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Xavier Léauté 2014-03-13 10:04:20 -07:00
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publications/whitepaper/druid.tex
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@ -797,11 +797,14 @@ threads and 672 total cores (hyperthreaded).
memory map the data instead of loading it into the Java heap.)
\end{itemize}
Query latencies are shown in Figure~\ref{fig:query_latency} and
the queries per minute is shown in Figure~\ref{fig:queries_per_min}.
Across all the various data sources, average query latency is approximately 550 milliseconds,
with 90\% of queries returning in less than 1 second,
95\% in under 2 seconds, and 99\% of queries taking less than 10 seconds to complete.
Query latencies are shown in Figure~\ref{fig:query_latency} and the queries per
minute is shown in Figure~\ref{fig:queries_per_min}. Across all the various
data sources, average query latency is approximately 550 milliseconds, with
90\% of queries returning in less than 1 second, 95\% in under 2 seconds, and
99\% of queries taking less than 10 seconds to complete.
Occasionally we observe spikes in latency, as observed on February 19,
in which case network issues on the cache nodes were compounded by very high
query load on one of our largest datasources.
\begin{figure}
\centering