Sean Busbey created HBASE-20665:
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Summary: "Already cached block XXX" message should be DEBUG
Key: HBASE-20665
URL: https://issues.apache.org/jira/browse/HBASE-20665
Project: HBase
Issue Type: Task
Components: BlockCache
Affects Versions: 2.0.0, 1.2.0
Reporter: Sean Busbey
Assignee: Sean Busbey
Fix For: 3.0.0, 2.1.0, 1.5.0
Testing a local cluster that relies on the LruBlockCache for a scan-heavy
workload and I'm getting a bunch of log entries at WARN
{code}
2018-05-30 12:28:47,192 WARN org.apache.hadoop.hbase.io.hfile.LruBlockCache:
Cached an already cached block: df01f5bf6a244f6bb1a626b927377fff_54780812
cb:df01f5bf6a244f6bb1a626b927377fff_54780812. This is harmless and can happen
in rare cases (see HBASE-8547)
{code}
As the log message notes (and the code confirms) this is a harmless result of
contention for getting a block into the CHM. the message should be at DEBUG.
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