[HBASE-8178] IPCUtil produces a LOT of WARN log spew

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.98.0, 0.95.0
• Component/s: IPC/RPC
• Hadoop Flags: Reviewed
• Assignee: Michael Stack
• Reporter: Sergey Shelukhin
• Created: 22/Mar/13 18:37
• Updated: 23/Sep/13 18:30
• Resolved: 23/Mar/13 21:06

Description

I was running some integration tests on trunk and noticed that IT log (which uses LoadTestTool with 16k records) is overflowing with this:

13/03/21 23:02:15 WARN ipc.IPCUtil: Buffer grew from 16384 to 16971
13/03/21 23:02:15 WARN ipc.IPCUtil: Buffer grew from 16384 to 18906
13/03/21 23:02:15 WARN ipc.IPCUtil: Buffer grew from 16384 to 18486
13/03/21 23:02:15 WARN ipc.IPCUtil: Buffer grew from 16384 to 22896
13/03/21 23:02:15 WARN ipc.IPCUtil: Buffer grew from 16384 to 22253

So much in fact, that

reznor-mbp:stripe sergey$ grep -a -c "Buffer grew" it.log 
2769498
reznor-mbp:stripe sergey$ grep -a -v "Buffer grew" it.log > it2.log
reznor-mbp:stripe sergey$ ll it*
-rw-r--r--  1 sergey  staff  189440541 Mar 22 11:22 it.log
-rw-r--r--  1 sergey  staff    1114677 Mar 22 11:33 it2.log

There are two questions.
1) Should this log be TRACE level, or there at all? it happens a lot.
2) Is this condition normal? I am assuming the log level was set to WARN for a reason