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

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Hinweis der Redaktion

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