Dan Moraru created HDFS-13082:
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Summary: cookieverf mismatch error over NFS gateway on Linux
Key: HDFS-13082
URL: https://issues.apache.org/jira/browse/HDFS-13082
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 2.7.3
Reporter: Dan Moraru
Running 'ls' on some directories over an HDFS-NFS gateway sometimes fails to
list the contents of those directories. Running 'ls' on those same directories
mounted via FUSE works. The NFS gateway logs errors like the following:
2018-01-29 11:53:01,130 ERROR org.apache.hadoop.hdfs.nfs.nfs3.RpcProgramNfs3:
cookieverf mismatch. request cookieverf: 1513390944415 dir cookieverf:
1516920857335
Reviewing
hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/RpcProgramNfs3.java
suggested that these errors can be avoided by setting
nfs.aix.compatibility.mode.enabled=true, and that is indeed the case. The
documentation lists https://issues.apache.org/jira/browse/HDFS-6549 as a known
issue, but also goes on to say that "regular, non-AIX clients should NOT enable
AIX compatibility mode. The work-arounds implemented by AIX compatibility mode
effectively disable safeguards to ensure that listing of directory contents via
NFS returns consistent results, and that all data sent to the NFS server can be
assured to have been committed." Server and client is this case are one and
the same, running Scientific Linux 7.4.
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