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https://issues.apache.org/jira/browse/MAPREDUCE-7329?focusedWorklogId=566036&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-566036
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ASF GitHub Bot logged work on MAPREDUCE-7329:
---------------------------------------------
Author: ASF GitHub Bot
Created on: 15/Mar/21 06:53
Start Date: 15/Mar/21 06:53
Worklog Time Spent: 10m
Work Description: lichaojacobs opened a new pull request #2775:
URL: https://github.com/apache/hadoop/pull/2775
jira: https://issues.apache.org/jira/browse/MAPREDUCE-7329
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Worklog Id: (was: 566036)
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Time Spent: 10m
> HadoopPipes task may fail when linux kernel version change from 3.x to 4.x
> --------------------------------------------------------------------------
>
> Key: MAPREDUCE-7329
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7329
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: chaoli
> Priority: Major
> Labels: patch
> Attachments:
> 0001-MAPREDUCE-7329-HadoopPipes-task-may-fail-when-linux-.patch,
> image-2021-03-15-14-29-49-475.png, image-2021-03-15-14-37-32-184.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Recently, we upgrade linux kernel version from 3.x to 4.x. And we find hadoop
> pipe task exit with connect timeout which is implemented by PingThread in
> HadoopPipes.cc.
> !image-2021-03-15-14-37-32-184.png!
> After a deep research, we finally find that current ping server won't accept
> ping client created socket, which has hidden danger:
> # it will cause tcp accept queue full(*default 50*)
> # when client close socket, server socket won't call close method, which
> will leave too many CLOSE_WAIT socket fd existed(*default 2h*), and accept
> queue never cleared.
> # Even worse, in 4.x linux kernel version, it will cause tcp drop packet
> directly which makes ping client connect time out. While In 3.x linux kernel
> version, when accept queue full, client can also make half connection till
> sync queue full (*default 2048*), so from client side, ping will aslo work
> till sync queue full. And after 3 hours, task will also exit with connect
> timeout exception.
> To fix this problem, we introduced a *PingSocketCleaner* thread, which will
> continuously accept ping socket connect from ping client. When socket close
> from client, cleaner thread will detected by inputStream read, then will
> finally close socket from sever side.
>
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