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From "Guilherme Mauro Germoglio Barbosa (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1251) HConnectionManager.getConnection(HBaseConfiguration) returns same HConnection for different HBaseConfigurations
Date Tue, 10 Mar 2009 13:30:53 GMT
HConnectionManager.getConnection(HBaseConfiguration) returns same HConnection for different

                 Key: HBASE-1251
                 URL: https://issues.apache.org/jira/browse/HBASE-1251
             Project: Hadoop HBase
          Issue Type: Bug
          Components: client
    Affects Versions: 0.19.0
            Reporter: Guilherme Mauro Germoglio Barbosa

This occurs when the following happens:

1. Consider a client that invokes HBaseAdmin.checkHBaseAvailable(config) before doing anything.
Although this method copies the HBaseConfiguration object and sets hbase.client.retries.number
to 1 (see HBaseAdmin, line 751), it creates an HBaseAdmin object, which invokes HConnectionManager.getConnection(conf).
Please notice that this conf is that with hbase.client.retries.number equals to 1. 
2. HConnectionManager.getConnection then creates a HConnection using this conf and puts it
into a static map (see HConnectionManager, line 93) indexed by hbase.rootdir. 
3. Then, if the same client now creates a HTable object (using, for instance, a HBaseConfiguration
with  hbase.client.retries.number equals to 10 but the same hbase.rootdir), it will invoke
HConnectionManager.getConnection(conf) again (see HTable, line 109). However, when it checks
the static map for a HConnection it finds one - the one previously created by the HBaseAdmin
object and using hbase.client.retries.number 1 - and returns it without creating a new one
with the correct HBaseConfiguration.

However, the expected behavior is: HConnectionManager must return different HConnections for
different HBaseConfigurations.  

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