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From "Robert Kanter (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6728) Give fetchers hint when ShuffleHandler rejects a shuffling connection
Date Tue, 25 Oct 2016 00:49:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15603745#comment-15603745
] 

Robert Kanter commented on MAPREDUCE-6728:
------------------------------------------

It applies to branch-2, but not to branch-2.8; so let's just leave this as 2.9 for now then.
 [~haibochen], unless you think we need this in 2.8?

> Give fetchers hint when ShuffleHandler rejects a shuffling connection
> ---------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6728
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6728
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: mrv2
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>             Fix For: 2.9.0, 3.0.0-alpha2
>
>         Attachments: mapreduce6728.001.patch, mapreduce6728.002.patch, mapreduce6728.003.patch,
mapreduce6728.004.patch, mapreduce6728.005.patch, mapreduce6728.006.patch, mapreduce6728.branch-2.8.patch,
mapreduce6728.prelim.patch
>
>
> If # of open shuffle connection to a node goes over the max, ShuffleHandler closes the
connection immediately without giving fetchers any hint of the reason, which causes fetchers
to fail due to exceptions 
> java.net.SocketException: Unexpected end of file from server
> 	at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:772)
> 	at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
> 	at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:769)
> 	at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
> 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1323)
> 	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.verifyConnection(Fetcher.java:430)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.setupConnectionsWithRetry(Fetcher.java:395)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.openShuffleUrl(Fetcher.java:266)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:323)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)
> OR 
> java.net.SocketException: Connection reset
> 	at java.net.SocketInputStream.read(SocketInputStream.java:196)
> 	at java.net.SocketInputStream.read(SocketInputStream.java:122)
> 	at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
> 	at java.io.BufferedInputStream.read1(BufferedInputStream.java:275)
> 	at java.io.BufferedInputStream.read(BufferedInputStream.java:334)
> 	at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:687)
> 	at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
> 	at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:769)
> 	at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:633)
> 	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1323)
> 	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.verifyConnection(Fetcher.java:430)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.setupConnectionsWithRetry(Fetcher.java:395)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.openShuffleUrl(Fetcher.java:266)
> 	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java
> Such failures are counted as fetcher failures



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