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From "Frantisek Vacek (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-7392) org.apache.hadoop.hdfs.DistributedFileSystem open invalid URI forever
Date Wed, 12 Nov 2014 12:55:33 GMT
Frantisek Vacek created HDFS-7392:

             Summary: org.apache.hadoop.hdfs.DistributedFileSystem open invalid URI forever
                 Key: HDFS-7392
                 URL: https://issues.apache.org/jira/browse/HDFS-7392
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
            Reporter: Frantisek Vacek
            Priority: Critical

In some specific circumstances, org.apache.hadoop.hdfs.DistributedFileSystem.open(invalid
URI) never timeouts and last forever.

What are specific circumstances:
1) HDFS URI (hdfs://share.merck.com:8020/someDir/someFile.txt) should point to valid IP address
but without name node service running on it.
2) There should be at least 2 IP addresses for such a URI. See output below:

[~/proj/quickbox]$ nslookup share.merck.com

share.merck.com canonical name = internal-gicprg-share-merck-com-1538706884.us-east-1.elb.amazonaws.com.
Name:   internal-gicprg-share-merck-com-1538706884.us-east-1.elb.amazonaws.com
Name:   internal-gicprg-share-merck-com-1538706884.us-east-1.elb.amazonaws.com

In such a case the org.apache.hadoop.ipc.Client.Connection.updateAddress() returns sometimes
true (even if address didn't actually changed see img. 1) and the timeoutFailures counter
is set to 0 (see img. 2). The maxRetriesOnSocketTimeouts (45) is never reached and connection
attempt is repeated forever.

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