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Hadoop Distcp to HCP or AWS S3a leading to Error - com.amazonaws.SdkClientException: Unable to execute HTTP request: sun.security.validator.ValidatorException: PKIX path building failed

 

Running Hadoop Distcp to copy data from S3a resulted in  below error - 


**com.amazonaws.SdkClientException: Unable to execute HTTP request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target”
Stack trace:

com.amazonaws.SdkClientException: Unable to execute HTTP request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.handleRetryableException(AmazonHttpClient.java:1114) ~[aws-java-sdk-core-1.11.280.jar!/:?]
at com.amazonaws.http.AmazonHttpClient$RequestExecutor.executeHelper(AmazonHttpClient.java:1064) ~[aws-java-sdk-core-1.11.280.jar!/:?]


To debug this error, turn SSL debug logging on  -Djavax.net.debug=all, or -Djavax.net.debug=ssl


Above parameters can be set in Java options like below - 


export _JAVA_OPTIONS="-Djava.io.tmpdir=/mydir/tmp -Djavax.net.debug=ssl"



Solution

  • Disable SSL check by setting following in Java Options - 
    • -Dcom.amazonaws.sdk.disableCertChecking=true

  • Above option is not good to disable SSL check. So, we should find Java Keystore and import certification of fs.s3a.endpoint certificate into same. Command to import certificate - 
    • keytool -importcert -file certificate.cer -keystore keystore.jks -alias "Alias"

But, how to find Java being used by your program in this case hadoop command line utility. Simply run your command in background then type ps aux | grep <process ID>. This should give you Java path  being used, and then you can go to following path to locate keystore - jre/lib/security/cacerts

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