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https://issues.apache.org/jira/browse/HDFS-16074?focusedWorklogId=611801&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-611801
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ASF GitHub Bot logged work on HDFS-16074:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 16/Jun/21 08:21
Start Date: 16/Jun/21 08:21
Worklog Time Spent: 10m
Work Description: jojochuang commented on pull request #3107:
URL: https://github.com/apache/hadoop/pull/3107#issuecomment-862157811
Wow. thanks a lot everyone for jumping on this one :)
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Issue Time Tracking
-------------------
Worklog Id: (was: 611801)
Time Spent: 40m (was: 0.5h)
> Remove an expensive debug string concatenation
> ----------------------------------------------
>
> Key: HDFS-16074
> URL: https://issues.apache.org/jira/browse/HDFS-16074
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.0.0-alpha1
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Major
> Labels: pull-request-available
> Attachments: Screen Shot 2021-06-16 at 2.32.29 PM.png
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Running a YCSB load query, found that we do an expensive string concatenation
> on the write path in DFSOutputStream.writeChunkPrepare().
> Nearly 25% of HDFS client write CPU time is spent here. It is not necessary
> because it's supposed to be a debug message. So let's remove it.
> {code}
> if (currentPacket == null) {
> currentPacket = createPacket(packetSize, chunksPerPacket, getStreamer()
> .getBytesCurBlock(), getStreamer().getAndIncCurrentSeqno(), false);
> DFSClient.LOG.debug("WriteChunk allocating new packet seqno={},"
> + " src={}, packetSize={}, chunksPerPacket={},
> bytesCurBlock={}",
> currentPacket.getSeqno(), src, packetSize, chunksPerPacket,
> getStreamer().getBytesCurBlock() + ", " + this); <---- here
> }
> {code}
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