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https://issues.apache.org/jira/browse/PHOENIX-4451?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved PHOENIX-4451.
-------------------------------------
Resolution: Duplicate
This is a symptom of PHOENIX-4460
> KeyRange has a very high allocation rate
> ----------------------------------------
>
> Key: PHOENIX-4451
> URL: https://issues.apache.org/jira/browse/PHOENIX-4451
> Project: Phoenix
> Issue Type: Bug
> Reporter: Andrew Purtell
>
> We are looking at sources for elevated GC pressure in production. During some
> live heap analysis we noticed the KeyRange class appears to be an outlier in
> terms of numbers of instances found in the live heap. I'm wondering if there
> is some opportunity for object/allocation reuse here? Or perhaps it can be
> converted into something amenable to escape analysis so we get stack
> allocations instead of heap allocations?
> This is Phoenix 4.13.0 on HBase 0.98.24:
> {noformat}
> num #instances #bytes class name
> ----------------------------------------------
> 1: 189592127 20432451240 [B
> 2: 77390411 1857369864 org.apache.phoenix.query.KeyRange
> 3: 14732411 844013608 [C
> 4: 15034590 481106880 java.util.HashMap$Node
> 5: 2587783 433834912 [Ljava.lang.Object;
> 6: 3336992 400439040
> org.apache.hadoop.hbase.regionserver.ScanQueryMatcher
> 7: 3336992 373743104
> org.apache.hadoop.hbase.regionserver.StoreScanner
> 8: 14729747 353513928 java.lang.String
> 9: 5605941 269085168 java.util.TreeMap
> 10: 6511408 208365056
> java.util.concurrent.ConcurrentHashMap$Node
> 11: 2250216 180176200 [Ljava.util.HashMap$Node;
> 12: 5463124 174819968 org.apache.hadoop.hbase.KeyValue
> 13: 5277319 168874208 java.util.Hashtable$Entry
> 14: 3336992 160175616
> org.apache.hadoop.hbase.regionserver.ScanDeleteTracker
> 15: 1734848 138787840
> org.apache.hadoop.hbase.io.encoding.FastDiffDeltaEncoder$FastDiffSeekerState
> 16: 1668418 120126096 org.apache.hadoop.hbase.client.Scan
> 17: 2142254 119966224
> org.apache.hadoop.hbase.regionserver.ScanWildcardColumnTracker
> num #instances #bytes class name
> ----------------------------------------------
> 1: 189774274 20451239624 [B
> 2: 77446115 1858706760 org.apache.phoenix.query.KeyRange
> 3: 14741777 844584352 [C
> 4: 15043664 481397248 java.util.HashMap$Node
> 5: 2591421 434232680 [Ljava.lang.Object;
> 6: 3339244 400709280
> org.apache.hadoop.hbase.regionserver.ScanQueryMatcher
> 7: 3339244 373995328
> org.apache.hadoop.hbase.regionserver.StoreScanner
> 8: 14739076 353737824 java.lang.String
> 9: 5609708 269265984 java.util.TreeMap
> 10: 6513671 208437472
> java.util.concurrent.ConcurrentHashMap$Node
> 11: 2251693 180293648 [Ljava.util.HashMap$Node;
> 12: 5477024 175264768 org.apache.hadoop.hbase.KeyValue
> 13: 5277320 168874240 java.util.Hashtable$Entry
> 14: 3339244 160283712
> org.apache.hadoop.hbase.regionserver.ScanDeleteTracker
> 15: 1759096 140727680
> org.apache.hadoop.hbase.io.encoding.FastDiffDeltaEncoder$FastDiffSeekerState
> 16: 1669544 120207168 org.apache.hadoop.hbase.client.Scan
> 17: 2143728 120048768
> org.apache.hadoop.hbase.regionserver.ScanWildcardColumnTracker
> num #instances #bytes class name
> ----------------------------------------------
> 1: 189920309 20464274472 [B
> 2: 77499190 1859980560 org.apache.phoenix.query.KeyRange
> 3: 14748627 845142696 [C
> 4: 15049176 481573632 java.util.HashMap$Node
> 5: 2593838 434563512 [Ljava.lang.Object;
> 6: 3340548 400865760
> org.apache.hadoop.hbase.regionserver.ScanQueryMatcher
> 7: 3340548 374141376
> org.apache.hadoop.hbase.regionserver.StoreScanner
> 8: 14745909 353901816 java.lang.String
> 9: 5611921 269372208 java.util.TreeMap
> 10: 6545786 209465152
> java.util.concurrent.ConcurrentHashMap$Node
> 11: 2252716 180374216 [Ljava.util.HashMap$Node;
> 12: 5484841 175514912 org.apache.hadoop.hbase.KeyValue
> 13: 5338662 170837184 java.util.Hashtable$Entry
> 14: 3340548 160346304
> org.apache.hadoop.hbase.regionserver.ScanDeleteTracker
> 15: 1771616 141729280
> org.apache.hadoop.hbase.io.encoding.FastDiffDeltaEncoder$FastDiffSeekerState
> 16: 1670196 120254112 org.apache.hadoop.hbase.client.Scan
> 17: 2144590 120097040
> org.apache.hadoop.hbase.regionserver.ScanWildcardColumnTracker
> {noformat}
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