Why is my Hadoop cluster slow?
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This document discusses ways to troubleshoot slow Hadoop jobs using metrics, logging, and tracing. It describes how to use the Ambari metrics system and Grafana dashboards to monitor metrics for clusters. It also explains how to leverage Hadoop logs and the YARN Application Timeline Service for logging and correlation across workloads. Finally, it presents Apache Zeppelin and analyzers for Hive, Tez, and YARN as tools for ad-hoc analysis to diagnose issues.
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Why is my Hadoop cluster slow?
- 1. Why is my Hadoop* job slow? Bikas Saha @bikassaha *Apache Hadoop, Falcon, Atlas, Tez, Sqoop, Flume, Kafka, Pig, Hive, HBase, Accumulo, Storm, Solr, Spark, Ranger, Knox, Ambari, ZooKeeper, Oozie, Zeppelin and the Hadoop elephant logo are trademarks of the Apache Software Foundation. Hitesh Shah
- 2. 2 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Agenda Metrics and Monitoring Logging and Correlation Tracing and Analysis
- 3. 3 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Metrics and Monitoring Metrics as high level pointers Ambari Metrics System Ambari Grafana Integration HBase, HDFS, YARN Dashboards Metrics based alerting
- 4. 4 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Metrics as high level pointers Machine level metrics like CPU load Application level metrics like HDFS counters Metrics at point of time Metrics anomalies along a time series Correlated anomalies Problem is to need to know what to look for
- 5. 5 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Ambari Metrics Service - Motivation Limited Ganglia capabilities OpenTSDB – GPL license and needs a Hadoop cluster Need service level aggregation as well as time based Alerts based on metrics system Ability to scale past a 1000 nodes Ability to perform analytics based on a use case Allow fine grained control over aspects like: retention, collection intervals, aggregation Pluggable and Extensible First version released with Ambari 2.0.0
- 6. 6 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Ambari Grafana Integration Open source dashboard builder integrated with AMS. Available from Ambari-2.2.2 Pre-defined host level and service level (HDFS, HBase, Yarn etc) dashboards. Added to Ambari through API after upgrade
- 7. 7 © Hortonworks Inc. 2011 – 2016. All Rights Reserved HBase Dashboard
- 8. 8 © Hortonworks Inc. 2011 – 2016. All Rights Reserved HDFS Dashboard
- 9. 9 © Hortonworks Inc. 2011 – 2016. All Rights Reserved YARN Dashboard
- 10. 10 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Metrics based Alerting Top N support to quickly identify potential offenders Alerting based on time series
- 11. 11 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Agenda Metrics and Monitoring Logging and Correlation Tracing and Analysis
- 12. 12 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Logging and Correlation HDFS, YARN Audit logs Caller Context YARN Application Timeline Service Lineage tracking of operations across workloads Ambari Log Search
- 13. 13 © Hortonworks Inc. 2011 – 2016. All Rights Reserved HDFS Audit Logs and Caller Context FSNamesystem.audit: allowed=true ugi=userA (auth:SIMPLE) ip=/172.22.68.32 cmd=create src=/tmp/in/_temporary/1/_temporary/attempt_14644848874070_0009_m_009995_0/part-m-09995 dst=null perm=root:hdfs:rw-r--r-- proto=rpc callerContext=tez_ta:attempt_1464484887407_0009_1_00_009995_0 FSNamesystem.audit: allowed=true ugi=userA (auth:SIMPLE) ip=/172.22.68.33 cmd=create src=/tmp/in2/_temporary/1/_temporary/attempt_1464484887407_0011_m_000097_0/part-m-00097 dst=null perm=root:hdfs:rw-r--r-- proto=rpc callerContext=mr_attempt_1464484887407_0011_m_000097_0 FSNamesystem.audit: allowed=true ugi=userB (auth:SIMPLE) ip=/172.22.68.34 cmd=create src=/tmp/in2/_temporary/1/_temporary/attempt_1464484887407_0011_m_000095_0/part-m-00095 dst=null perm=root:hdfs:rw-r--r-- proto=rpc callerContext=mr_attempt_1464484887407_0011_m_000095_0
- 14. 14 © Hortonworks Inc. 2011 – 2016. All Rights Reserved ResourceManager Audit Logs and Caller Context resourcemanager.RMAuditLogger: USER=userA IP=172.22.68.32 OPERATION=Submit Application Request TARGET=ClientRMService RESULT=SUCCESS APPID=application_1464484887407_0001 CALLERCONTEXT=PIG-pigSmoke.sh-8a052588-0013-4e39-83b1-ebad699d8e2e resourcemanager.RMAuditLogger: USER=userA IP=172.22.68.30 OPERATION=Submit Application Request TARGET=ClientRMService RESULT=SUCCESS APPID=application_1464484887407_0009 CALLERCONTEXT=CLI resourcemanager.RMAuditLogger: USER=userB IP=172.22.68.34 OPERATION=Submit Application Request TARGET=ClientRMService RESULT=SUCCESS APPID=application_1464484887407_0008 CALLERCONTEXT=mr_attempt_1464484887407_0007_m_000000_0 resourcemanager.RMAuditLogger: USER=userB IP=172.22.68.30 OPERATION=Submit Application Request TARGET=ClientRMService RESULT=SUCCESS APPID=application_1464484887407_0012 CALLERCONTEXT=HIVE_SSN_ID:f3aadf99-9e36-494b-84a1-99b685ac344b
- 15. 15 © Hortonworks Inc. 2011 – 2016. All Rights Reserved YARN Application Timeline Service YARN service for fine grained application level tracing Enables complex metadata to be recorded as the YARN app makes progress Allows retrieval of this timeline data based on filters Can be used to drive limited online analytics and extensive post-hoc analysis
- 16. 16 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Lineage Tracking using YARN Timeline Timeline:8188/ws/v1/timeline/TEZ_DAG_ID/dag_1464484887407_0013_1 dagContext: { callerId: "root_20160529021115_006f8007-5840-4c64-9970-c1b506f68db2", callerType: "HIVE_QUERY_ID", context: "HIVE", description: "select user, count(visit_id) as visits from users group by user order by visits” } Timeline:8188/ws/v1/timeline/HIVE_QUERY_ID/root_20160529021115_006f8007- 5840-4c64-9970-c1b506f68db2 hiveContext: { callerId: “workflow_abcd", callerType: “OOZIE_ID", context: “OOZIE", description: “Daily ETL Summary Job” }
- 17. 17 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Ambari Log Search
- 18. 18 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Ambari Log Search
- 19. 19 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Agenda Metrics and Monitoring Logging and Correlation Tracing and Analysis
- 20. 20 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Tracing and Analysis Use Big Data methods to solve Big Data problems Apache Zeppelin as analytical tool Hive/Tez/YARN notebook for analysis
- 21. 21 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Zeppelin for Ad-hoc Analytics
- 22. 22 © Hortonworks Inc. 2011 – 2016. All Rights Reserved YARN Analyzer
- 23. 23 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Tez Analyzer
- 24. 24 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Tez Analyzer
- 25. 25 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Tez Analyzer
- 26. 26 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Thank You
Editor's Notes
- #14: It is now possible to infer which application/job did what in HDFS Files created can be tracked down to the MR or Tez job and the specific task attempt that created them. Using simple string manipulation and aggregations, you can file jobs inducing high loads against the Namenode.
- #15: Tracking what YARN maps to what application type and instance is now much easier. It could made more easier if “mr_attempt_1464484887407_0007_m_000000_0” pointed to an oozie worklow instead of the MR job Who killed my application and how (command-line, webservice)?