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https://issues.apache.org/jira/browse/HDFS-14737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17249994#comment-17249994
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Daniel Howard commented on HDFS-14737:
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On 3.2.1 I'm seeing the NFS server wedge up with messages like these:
{{2020-12-15 14:35:49,558 WARN org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtx: Got
overwrite [2661285888-2662334464) smaller than current offset 2792085880, drop
the request.}}
{{2020-12-15 14:35:49,609 INFO org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtx:
Perfect overwrite has same content, updating the mtime, then return success}}
{{2020-12-15 14:35:49,701 WARN org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtx: Got
overwrite [2662334464-2663383040) smaller than current offset 2792085880, drop
the request.}}
{{2020-12-15 14:35:49,753 INFO org.apache.hadoop.hdfs.nfs.nfs3.OpenFileCtx:
Perfect overwrite has same content, updating the mtime, then return success}}
> Writing data through the HDFS nfs3 service is very slow, and timeout occurs
> while mount directories on the nfs client
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14737
> URL: https://issues.apache.org/jira/browse/HDFS-14737
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 2.7.2
> Reporter: liying
> Assignee: liying
> Priority: Major
>
> We know the NFS Gateway supports NFSv3 and allows HDFS to be mounted as part
> of the client’s local file system. I start the portmap and nfs3server in the
> hadoop node，and use the command （mount -t nfs -o vers=3,proto=tcp,nolock
> nfs3serverIP:/ /hdfs） to mount. It works well。Then i ues this command to
> mount on many client. And i used linux cp to copy files to the mounted
> dir(/hdfs),found the speed was very slow . There is a lot of information in
> the log as the follow:
> 2019-08-14 15:36:28,347 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:37:03,093 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:37:03,850 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:37:14,780 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:37:14,928 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:37:28,410 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:38:09,310 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:38:10,069 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:38:14,856 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:38:14,957 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:38:28,475 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:39:14,923 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:39:14,987 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:39:15,541 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:39:16,287 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:39:28,530 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:40:15,015 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:40:15,024 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:40:15,028 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:40:21,757 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:40:22,508 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:40:28,583 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:41:15,063 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:41:15,086 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:41:27,983 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:41:28,647 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:41:28,729 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:42:15,184 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:42:15,191 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> 2019-08-14 15:42:28,707 INFO org.apache.hadoop.security.ShellBasedIdMapping:
> Can't map group supergroup. Use its string hashcode:-1710818332
> Then i print the jstack log to check the threads of nfs3server， and found
> some threads' status are waiting for monitor entry : BLOCKED(on object
> monitor). After checking the codes, I found that the updateMapIncr will be
> invoked every time if the group or user doesn't exits. And In the class
> ShellBasedIdMapping, many methods are made with synchronized. So i think we
> can avoid to invoke the updateMapIncr every time.
>
>
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