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https://issues.apache.org/jira/browse/HDFS-14083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16690387#comment-16690387
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Hadoop QA commented on HDFS-14083:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 6s{color}
| {color:red} HDFS-14083 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-14083 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12948583/HDFS-14083.004.patch |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/25550/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> libhdfs logs errors when opened FS doesn't support ByteBufferReadable
> ---------------------------------------------------------------------
>
> Key: HDFS-14083
> URL: https://issues.apache.org/jira/browse/HDFS-14083
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: native
> Affects Versions: 3.0.3
> Reporter: Pranay Singh
> Assignee: Pranay Singh
> Priority: Minor
> Attachments: HADOOP-15928.001.patch, HADOOP-15928.002.patch,
> HDFS-14083.003.patch, HDFS-14083.004.patch
>
>
> Problem:
> ------------
> There is excessive error logging when a file is opened by libhdfs
> (DFSClient/HDFS) in S3 environment, this issue is caused because buffered
> read is not supported in S3 environment, HADOOP-14603 "S3A input stream to
> support ByteBufferReadable"
> The following message is printed repeatedly in the error log/ to STDERR:
> {code}
> --------------------------------------------------------------------------------------------------
> UnsupportedOperationException: Byte-buffer read unsupported by input
> streamjava.lang.UnsupportedOperationException: Byte-buffer read unsupported
> by input stream
> at
> org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:150)
> {code}
> h3. Root cause
> After investigating the issue, it appears that the above exception is printed
> because
> when a file is opened via {{hdfsOpenFileImpl()}} calls {{readDirect()}} which
> is hitting this
> exception.
> h3. Fix:
> Since the hdfs client is not initiating the byte buffered read but is
> happening in a implicit manner, we should not be generating the error log
> during open of a file.
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