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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6157) Connect failed in shuffle (due to NM down) could break current retry logic to tolerant NM restart.
Date Wed, 12 Nov 2014 06:12:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14207728#comment-14207728
] 

Hadoop QA commented on MAPREDUCE-6157:
--------------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12681003/MAPREDUCE-6157.patch
  against trunk revision 53f64ee.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5009//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/5009//console

This message is automatically generated.

> Connect failed in shuffle (due to NM down) could break current retry logic to tolerant
NM restart.
> --------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6157
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6157
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Junping Du
>            Assignee: Junping Du
>            Priority: Critical
>         Attachments: MAPREDUCE-6157.patch
>
>
> The connection failure log during NM restart is as following:
> {noformat}
> 014-11-12 03:31:20,728 WARN [fetcher#23] org.apache.hadoop.mapreduce.task.reduce.Fetcher:
Failed to connect to ip-172-31-37-212.ec2.internal:13562 with 4 map outputs
> java.net.ConnectException: Connection refused
>         at java.net.PlainSocketImpl.socketConnect(Native Method)
>         at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
>         at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
>         at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
>         at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
>         at java.net.Socket.connect(Socket.java:579)
>         at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
>         at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
>         at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
>         at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)
>         at sun.net.www.http.HttpClient.New(HttpClient.java:308)
>         at sun.net.www.http.HttpClient.New(HttpClient.java:326)
>         at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:996)
>         at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932)
>         at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:850)
>         at org.apache.hadoop.mapreduce.task.reduce.Fetcher.connect(Fetcher.java:685)
>         at org.apache.hadoop.mapreduce.task.reduce.Fetcher.setupConnectionsWithRetry(Fetcher.java:386)
>         at org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:292)
>         at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)
> 2014-11-12 03:31:20,743 INFO [fetcher#22] org.apache.hadoop.mapreduce.task.reduce.Fetcher:
for url=13562/mapOutput?job=job_1415762969065_0001&reduce=3&map=attempt_1415762969065_0001_m_000021_0,attempt_1415762969065_0001_m_000004_0,attempt_1415762969065_0001_m_000018_0,attempt_1415762969065_0001_m_000015_0,attempt_1415762969065_0001_m_000001_0,attempt_1415762969065_0001_m_000009_0,attempt_1415762969065_0001_m_000012_0,attempt_1415762969065_0001_m_000006_0
sent hash and received reply
> {noformat}
> We have some code to handle the retry logic for connection with a timeout (as below).
But if connection get refused quickly, we only try very limited times and it get failed also
quickly.
> {code}
> while (true) {
>       try {
>         connection.connect();
>         break;
>       } catch (IOException ioe) {
>         // update the total remaining connect-timeout
>         connectionTimeout -= unit;
>         // throw an exception if we have waited for timeout amount of time
>         // note that the updated value if timeout is used here
>         if (connectionTimeout == 0) {
>           throw ioe;
>         }
>         // reset the connect timeout for the last try
>         if (connectionTimeout < unit) {
>           unit = connectionTimeout;
>           // reset the connect time out for the final connect
>           connection.setConnectTimeout(unit);
>         }
>       }
> {code}
> We should fix this to make retry can continue until timeout.



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