Distributed systems-radiology

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Modern Radiology for Distributed Systems Dietrich Featherston @d2fn Thursday, October 11, 12

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This is atalk about monitoring Thursday, October 11, 12

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But not justany kind of monitoring Non-invasive monitoring Thursday, October 11, 12

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non-invasive monitoring measures taken to describe the state of a system with minimal changes to the system being monitored Thursday, October 11, 12

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Insight Radiographic Imagery Invasiveness Thursday, October 11, 12

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preventative care measures taken to prevent diseases or injuries rather than curing them or treating their symptoms Thursday, October 11, 12

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Non-invasive monitoring techniques focus primarily on host-based metrics Why is this a problem? Thursday, October 11, 12

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Because applications are distributed Thursday, October 11, 12

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Information emitted about nodes in the network n Information emitted about edges in the network n² Network size Thursday, October 11, 12

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We analyze cell-structure because we can’t envision the whole organism We react to disease and injury because we lack preventative care Thursday, October 11, 12

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We lack preventativecare for applications because our non-invasive monitoring techniques are growing less and less meaningful Thursday, October 11, 12

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Radiology is usefulin illuminating non-invasive monitoring of distributed systems Thursday, October 11, 12

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Context is everything Thursday, October 11, 12

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How do weuse context? Thursday, October 11, 12

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!!! Context Your Big Dumb Data Thursday, October 11, 12

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Human brain Diagnoses + med school Radiographic Imagery Thursday, October 11, 12

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E.T. Signal Processing VLA Output Thursday, October 11, 12

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Application Topology Signal Processing Expert Brain Application Behavior Network Thursday, October 11, 12 Data

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dimensions (11) measurements (8) epoch seconds egress packets epoch minutes egress octets epoch hours ingress packets node id ingress octets source ip retransmits source port errors dest ip dest port app-rtt interface handshake-rtt country network/asn Thursday, October 11, 12

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Case Study #1 GC-Death of a distributed JVM application Thursday, October 11, 12

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Case Study #2 Symptoms: - Latent Riak handoff - Cluster throughput bottoming out Thursday, October 11, 12

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busy_dist_port Thursday, October 11,12

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+zdbbl 8192 Thursday, October11, 12

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Case Study #3 Bringing a dead riak node back online Thursday, October 11, 12

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Case Study #4 Retransmits 10% of total network throughput Thursday, October 11, 12

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var put: HttpPut= null try { // ... put data } catch { case e: Exception => // ... handle exception } finally { if(put != null) { put.abort() } } Thursday, October 11, 12

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var put: HttpPut= null try { // ... put data } catch { case e: Exception => // ... handle exception } finally { if(put != null) { put.abort() } } Thursday, October 11, 12

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Source: http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/client/methods/HttpRequestBase.html#abort() abort public void abort() Description copied from interface: HttpUriRequest Aborts execution of the request. THANKS Thursday, October 11, 12

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129 public void abort() { 130 ClientConnectionRequest localRequest; 131 ConnectionReleaseTrigger localTrigger; 132 133 this.abortLock.lock(); 134 try { 135 if (this.aborted) { 136 return; 137 } 138 this.aborted = true; 139 140 localRequest = connRequest; 141 localTrigger = releaseTrigger; 142 } finally { 143 this.abortLock.unlock(); 144 } 145 146 // Trigger the callbacks outside of the lock, to prevent 147 // deadlocks in the scenario where the callbacks have 148 // their own locks that may be used while calling 149 // setReleaseTrigger or setConnectionRequest. 150 if (localRequest != null) { 151 localRequest.abortRequest(); 152 } 153 if (localTrigger != null) { 154 try { 155 localTrigger.abortConnection(); 156 } catch (IOException ex) { 157 // ignore 158 } 159 } 160 } Thursday, October 11, 12

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augmented intelligence precedes artificial intelligence Thursday, October 11, 12

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95 18 Wilhelm Röntgen discovers X-Rays First medical use of x-rays in human imaging takes place one month later Thursday, October 11, 12

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95 05 18 19 First English text on chest radiography Wilhelm Röntgen discovers X-Rays First medical use of x-rays in human imaging takes place one month later Thursday, October 11, 12

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20 95 05 18 19 19 First English text on chest radiography Society of Radiographers formed Wilhelm Röntgen discovers X-Rays First medical use of x-rays in human imaging takes place one month later Thursday, October 11, 12

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Recognition of radiologyas a formal medical discipline was a cultural problem, not a technology problem http://www.bshr.org.uk/page13.html Thursday, October 11, 12

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If you wantto talk to me about the query language used to ask questions of the network data we collect at Boundary talk to me after or hit me up on twitter. @d2fn github.com/dietrichf Thursday, October 11, 12

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Find 45 minutesget volume_1s_meter_ip [ meter in {1, 2, 226, 301}; of total traffic epochMillis from -18h for 45m; seen on meters categorize ] 1, 2, 226, & 301 sum(ingress) as ingress, sum(egress) as egress, starting 18 hours sum(ingressPackets + ago broken egressPackets) as packets, sum(retransmits) as retransmits, down by peer ip bymean(appRttUsec/1000) as appRttMs retain top 10 by epochMillis, ip retain the ratio of top 10 retransmits to on retransmits/packets per epochMillis packets Thursday, October 11, 12

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Distributed systems-radiology

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