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via the RuntimeContext, which is exposed by RichFunctions (RichFlatMapFunction, RichMapFunction, (Co)ProcessFunction). • The StateDescriptor is specific to the state primitive and includes the name output and state update atomic Vasiliki Kalavri | Boston University 2020 • Working with State: https://ci.apache.org/projects/flink/flink-docs- release-1.10/dev/stream/state/state.html • Managing State

caolei – 监控Apache Flink应用程序(入门) 1 https://ci.apache.org/projects/flink/flink-docs-release-1.7/monitoring/metrics.html#registering-metrics 2 https://ci.apache.org/projects/flink/flink-docs-release-1 numberOfFailedCheckpoints > threshold caolei – 监控Apache Flink应用程序(入门) 进度和吞吐量监控 – 10 3 https://ci.apache.org/projects/flink/flink-docs-release-1.7/dev/stream/operators/#task-chaining-and-resource-groups events are persisted in the message queue. caolei – 监控Apache Flink应用程序(入门) 进度和吞吐量监控 – 15 4 https://ci.apache.org/projects/flink/flink-docs-release-1.7/monitoring/metrics.html#latency-tracking 2. During

range {1, 2, …, m} ??? Vasiliki Kalavri | Boston University 2020 22 for j=1 to p do i = hj(x) ci,j++ Adding an element to the sketch stream elements x All counters are initialized to 0s 0 0 average of all counters, but the minimum. let f: array of length p for j=1 to p do i = hj(x) f[j] = ci,j return min(f[1], f[2], …, f[p]) ??? Vasiliki Kalavri | Boston University 2020 24 Computing top-k

input rates and periodically estimates operator selectivities. • The load shedder assigns a cost, ci, in cycles per tuple, and a selectivity, si, to each operator i. • The statistics manager collects

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\ tar -xvf Python-3.7.9.tgz && \ cd Python-3.7.9 && \ ./configure --without-tests --enable-shared && \ make -j6 && \ make install && \ ldconfig /usr/local/lib && \ cd .. && rm -f Python-3.7.9.tgz && rm

\ tar -xvf Python-3.7.9.tgz && \ cd Python-3.7.9 && \ ./configure --without-tests --enable-shared && \ make -j6 && \ make install && \ ldconfig /usr/local/lib && \ cd .. && rm -f Python-3.7.9.tgz && rm