Sailesh Mukil created HDFS-11529:
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Summary: libHDFS still does not return appropriate error
information in many cases
Key: HDFS-11529
URL: https://issues.apache.org/jira/browse/HDFS-11529
Project: Hadoop HDFS
Issue Type: Bug
Components: libhdfs
Affects Versions: 2.6.0
Reporter: Sailesh Mukil
Priority: Critical
libHDFS uses a table to compare exceptions against and returns a corresponding
error code to the application in case of an error.
However, this table is manually populated and many times is disremembered when
new exceptions are added.
This causes libHDFS to return EINTERNAL (or Unknown Error(255)) whenever these
exceptions are hit. These are some examples of exceptions that have been
observed on an Error(255):
org.apache.hadoop.ipc.StandbyException (Operation category WRITE is not
supported in state standby)
java.io.EOFException: Cannot seek after EOF
javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException:
No valid credentials provided (Mechanism level: Failed to find any Kerberos tgt)
It is of course not possible to have an error code for each and every type of
exception, so one suggestion of how this can be addressed is by having a call
such as hdfsGetLastException() that would return the last exception that a
libHDFS thread encountered. We can make use of the Thread Local Storage to
store this information. Also, this makes sure that the current functionality is
preserved.
This is a follow up from HDFS-4997.
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