[MAPREDUCE-6173] Document the configuration of deploying MR over distributed cache with enabling wired encryption at the same time

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.7.0
• Component/s: distributed-cache, documentation
• Target Version/s: 2.6.1
• Assignee: Junping Du
• Reporter: Junping Du
• Created: 25/Nov/14 15:33
• Updated: 24/Apr/15 23:15
• Resolved: 13/Jan/15 18:10

Description

Use the current documented configuration (specified in http://hadoop.apache.org/docs/stable/hadoop-mapreduce-client/hadoop-mapreduce-client-core/DistributedCacheDeploy.html) to work with the cluster enabling shuffle encryption (http://hadoop.apache.org/docs/stable/hadoop-mapreduce-client/hadoop-mapreduce-client-core/EncryptedShuffle.html) will cause the job failed with exception below:

2014-10-10 02:17:16,600 WARN [fetcher#1] org.apache.hadoop.mapreduce.task.reduce.Fetcher: Failed to connect to tassapol-centos5nano1-3.cs1cloud.internal:13562 with 1 map outputs
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1731)
	at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:241)
	at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:235)
	at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1206)
	at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:136)
	at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:593)
	at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:529)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:925)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1170)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1197)
	at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1181)
	at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:434)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.setNewClient(AbstractDelegateHttpsURLConnection.java:81)
	at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.setNewClient(AbstractDelegateHttpsURLConnection.java:61)
	at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:584)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1193)
	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:379)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:318)
	at org.apache.hadoop.mapreduce.task.reduce.Fetcher.verifyConnection(Fetcher.java:427)

This is due to ssl-client.xml is not included in MR tar ball when we deploy it over distributed cache. Putting the ssl-client.xml on CLASSPATH of MR job can resolve the problem and we should document it.

Issue Links

• relates to: MAPREDUCE-4421 Run MapReduce framework via the distributed cache