[HDFS-8026] Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.7.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Target Version/s: 2.8.0
• Assignee: Colin McCabe
• Reporter: Colin McCabe
• Created: 31/Mar/15 02:03
• Updated: 30/Aug/16 01:37
• Resolved: 01/Apr/15 23:12

Description

We should trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk. When tracing writeChunk, we get a new trace span every 512 bytes; when tracing writeChecksumChunks, we normally get a new trace span only when the FSOutputSummer buffer is full (9x less often.)