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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3375) Put client name in DataXceiver thread name for readBlock and keepalive
Date Mon, 07 May 2012 20:46:52 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13269983#comment-13269983

Todd Lipcon commented on HDFS-3375:

Since this just changes thread names, no new unit tests. I did verify manually on a cluster
with jstack output:

- While uploading a file:

"DataXceiver for client DFSClient_NONMAPREDUCE_-769101204_1 at / [Receiving
block BP-1115842170-]" daemon prio=10
tid=0x0000000040ff6000 nid=0x6215 runnable [0x00007fe5188c8000]

- While downloading the same file

"DataXceiver for client DFSClient_NONMAPREDUCE_-412315870_1 at / [Sending block
BP-1115842170-]" daemon prio=10 tid=0x0000000040bb8000
nid=0xa83 runnable [0x00007fe5188c9000]

- During keepalive:
"DataXceiver for client DFSClient_NONMAPREDUCE_-1536450876_1 at / [Waiting
for operation #111]" daemon prio=10 tid=0x00000000409a3000 nid=0x38f3 runnable [0x00007fe5188c9000]

> Put client name in DataXceiver thread name for readBlock and keepalive
> ----------------------------------------------------------------------
>                 Key: HDFS-3375
>                 URL: https://issues.apache.org/jira/browse/HDFS-3375
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 2.0.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Trivial
>         Attachments: hdfs-3375.txt
> Currently the datanode thread names include the client for write operations, but not
for read. We should include the client name for read ops. Additionally, in the keepalive phase,
we should include the client name that initiated the previous request as well.

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