Xiao Chen created HADOOP-15401: ---------------------------------- Summary: ConcurrentModificationException on Subject.getPrivateCredentials in UGI constructor Key: HADOOP-15401 URL: https://issues.apache.org/jira/browse/HADOOP-15401 Project: Hadoop Common Issue Type: Bug Reporter: Xiao Chen
Seen a recent exception from KMS client provider as follows: {noformat} java.io.IOException: java.util.ConcurrentModificationException at org.apache.hadoop.crypto.key.kms.KMSClientProvider.createConnection(KMSClientProvider.java:488) at org.apache.hadoop.crypto.key.kms.KMSClientProvider.decryptEncryptedKey(KMSClientProvider.java:776) at org.apache.hadoop.crypto.key.kms.LoadBalancingKMSClientProvider$5.call(LoadBalancingKMSClientProvider.java:287) at org.apache.hadoop.crypto.key.kms.LoadBalancingKMSClientProvider$5.call(LoadBalancingKMSClientProvider.java:283) at org.apache.hadoop.crypto.key.kms.LoadBalancingKMSClientProvider.doOp(LoadBalancingKMSClientProvider.java:123) at org.apache.hadoop.crypto.key.kms.LoadBalancingKMSClientProvider.decryptEncryptedKey(LoadBalancingKMSClientProvider.java:283) at org.apache.hadoop.crypto.key.KeyProviderCryptoExtension.decryptEncryptedKey(KeyProviderCryptoExtension.java:532) at org.apache.hadoop.hdfs.DFSClient.decryptEncryptedDataEncryptionKey(DFSClient.java:927) at org.apache.hadoop.hdfs.DFSClient.createWrappedInputStream(DFSClient.java:946) at org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:316) at org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:311) at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81) at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:323) Caused by: java.util.ConcurrentModificationException at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966) at java.util.LinkedList$ListItr.next(LinkedList.java:888) at javax.security.auth.Subject$SecureSet$1.next(Subject.java:1070) at javax.security.auth.Subject$ClassSet$1.run(Subject.java:1401) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject$ClassSet.populateSet(Subject.java:1399) at javax.security.auth.Subject$ClassSet.<init>(Subject.java:1372) at javax.security.auth.Subject.getPrivateCredentials(Subject.java:767) at org.apache.hadoop.security.authentication.util.KerberosUtil.hasKerberosKeyTab(KerberosUtil.java:267) at org.apache.hadoop.security.UserGroupInformation.<init>(UserGroupInformation.java:715) at org.apache.hadoop.security.UserGroupInformation.<init>(UserGroupInformation.java:701) at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:742) at org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator.authenticate(DelegationTokenAuthenticator.java:141) at org.apache.hadoop.security.authentication.client.AuthenticatedURL.openConnection(AuthenticatedURL.java:348) at org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticatedURL.openConnection(DelegationTokenAuthenticatedURL.java:333) at org.apache.hadoop.crypto.key.kms.KMSClientProvider$1.run(KMSClientProvider.java:477) at org.apache.hadoop.crypto.key.kms.KMSClientProvider$1.run(KMSClientProvider.java:472) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1962) at org.apache.hadoop.crypto.key.kms.KMSClientProvider.createConnection(KMSClientProvider.java:471) ... 12 more {noformat} It looks like we have ran into a race inside jdk's Subject class. Found https://bugs.openjdk.java.net/browse/JDK-4892913 but that jira was created before Hadoop.... [~daryn], any thoughts on this? (With all due respect, we have not seen this in versions without HADOOP-9747 yet) -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: common-dev-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-dev-h...@hadoop.apache.org