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https://issues.apache.org/jira/browse/MAPREDUCE-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haibo Chen updated MAPREDUCE-6728:
----------------------------------
    Attachment: mapreduce6728.002.patch

> 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
>         Attachments: mapreduce6728.001.patch, mapreduce6728.002.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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