[HBASE-3014] Change UnknownScannerException log level to WARN

• Type: Improvement
• Status: Closed
• Priority: Trivial
• Resolution: Cannot Reproduce
• Affects Version/s: 0.20.6
• Component/s: regionserver
• Assignee: Unassigned
• Reporter: Ken Weiner
• Created: 18/Sep/10 00:23
• Updated: 12/Jun/22 00:11
• Resolved: 19/Mar/14 23:50

Description

I see a lot of UnknownScannerException messages in the log at ERROR level when I'm running a MapReduce job that scans an HBase table. These messages are logged under normal conditions, and according to jdcryans, should probably be logged at a less severe log level like WARN.

Example error message:

2010-09-16 09:20:52,398 ERROR org.apache.hadoop.hbase.regionserver.HRegionServer: 
org.apache.hadoop.hbase.UnknownScannerException: Name: -8711007779313115048
	at org.apache.hadoop.hbase.regionserver.HRegionServer.next(HRegionServer.java:1880)
	at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657)
	at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)

Reference to the HBase users mailing list thread where this was originally discussed:
http://markmail.org/thread/ttzbi6c7et6mrq6o

This is a simple, change, so I didn't include a formal patch. If one is required, I will gladly create and attach one.