When HMaster is running,there are a lot of HServerLoad instances（far greater
than the regions）,it has risk of OOME.
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Key: HBASE-3906
URL: https://issues.apache.org/jira/browse/HBASE-3906
Project: HBase
Issue Type: Improvement
Components: master
Affects Versions: 0.90.2
Environment: 1 hmaster,4 regionserver,about 100,000 regions.
Reporter: jian zhang
Fix For: 0.90.4
1、Start hbase cluster;
2、After hmaster finish regions assignement,use jmap to dump the memory of
hmaster;
3、Use MAT to analyse the dump file,there are too many HServerLoad instances,and
these instances occupy more than 3G memory;
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