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HBaseCon 2013: Using Metrics to Monitor and Debug Apache HBase

  1. 1. 1 Using Metrics How to monitor and debug Apache HBase with metrics
  2. 2. 2 Hi! I’m Elliott eclark@apache.org @elliottnclark Engineer @ Cloudera
  3. 3. Rules of HBase Metrics 1. Collect Metrics 2. Collect Metrics 3. Know your steady state 4. Explore 5. Correlate 3
  4. 4. Examples • User Error • Region Skew • GC Pressure • Suboptimal HBase • Balancer not Balancing 4
  5. 5. Region Skew 5 Photo From: http://www.flickr.com/photos/64618542@N00/
  6. 6. Region Skew 6
  7. 7. Region Skew Symptoms • Long tail latencies • Unbalanced WALs • Crashing region servers 7
  8. 8. Region Skew Fixes • Hash Row Key • Add random salt to start of Row Key • Re-Arrange The Row Key • Add Caching 8
  9. 9. GC Pressure 9 Photo by: http://www.flickr.com/photos/wwarby/
  10. 10. GC Pressure 10
  11. 11. GC Pressure Symptoms • Crashing region servers • ZK Connection Issues • Spiky latency 11
  12. 12. GC Pressure Fixes • Switch map reduce to Bulk Load • Pre-Aggregate Puts • Reduce data returned per scan#next 12
  13. 13. Bad Balancer 13 Photo By: http://www.flickr.com/photos/jimmiehomeschoolmom/
  14. 14. Bad Balancer 14
  15. 15. Bad Balancer Symptoms • Bad latency after balancer • Bad cache hit on some servers 15
  16. 16. Coming Soon • Better balancer • More per region metrics • Renamed Metrics • Metrics2 based metrics 16
  17. 17. Metrics Options Cloudera Manger OpenTSDB 17 Ganglia Ganglia Image From:http://www.flickr.com/photos/hongiiv/
  18. 18. 18

Editor's Notes

  • Slow DOWN!NO THUMBS!
  • Talk about the two different catagories.Suboptimal usage of hbaseThings hbase should handle for you.
  • Explain that region skew is an example.
  • Don’t talk about the symtoms.
  • Lots of hot regions on the same region serverRegions fighting over space in the Block Cache.
  • Go forth and collect metrics.
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