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https://issues.apache.org/jira/browse/HDFS-14608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16872602#comment-16872602
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Íñigo Goiri commented on HDFS-14608:
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As an example, DataXceiver outputs something like:
{code}
2019-06-25 11:00:13,218 INFO [DataXceiver for client at /10.65.35.41:35419
[Receiving block BP-1191059133-10.1.2.3-1458888702348:blk_1113379522_69745835]]
org.apache.hadoop.hdfs.server.datanode.DataNode: Receiving
BP-1191059133-10.1.2.3-1458888702348:blk_1113379522_69745835 src:
/10.1.2.3:35419 dest: /10.1.2.4:10010
2019-06-25 11:00:13,515 INFO [DataXceiver for client at /10.65.35.41:35419
[Receiving block BP-1191059133-10.1.2.3-1458888702348:blk_1113379522_69745835]]
org.apache.hadoop.hdfs.server.datanode.DataNode: Received
BP-1191059133-10.1.2.3-1458888702348:blk_1113379522_69745835 src:
/10.1.2.3:35419 dest: /10.1.2.4:10010 of size 485214
{code}
> DataNode$DataTransfer should be named
> -------------------------------------
>
> Key: HDFS-14608
> URL: https://issues.apache.org/jira/browse/HDFS-14608
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Íñigo Goiri
> Priority: Minor
> Fix For: 3.3.0
>
>
> Currently, the {{DataTransfer}} thread has no name and it just outputs the
> default {{toString()}}.
> This shows in the logs in jstack as something like:
> {code}
> 2019-06-25 11:01:01,211 INFO
> [org.apache.hadoop.hdfs.server.datanode.DataNode$DataTransfer@609ed67a]
> org.apache.hadoop.hdfs.server.datanode.DataNode: DataTransfer, at
> CO4AEAP0000C1AF:10010: Transmitted
> BP-1191059133-10.1.2.3-1458888702348:blk_1113379522_69745835
> (numBytes=485214) to 10.1.2.3/10.1.2.3:10010
> {code}
> As this uses the {{Daemon}} class, the name is set based on:
> {code}
> public Daemon(Runnable runnable) {
> super(runnable);
> this.runnable = runnable;
> this.setName(((Object)runnable).toString());
> }
> {code}
> We should implement toString to at least have the name of the block being
> transfferred or something similar to what DataXceiver does (e.g., HDFS-3375).
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