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https://issues.apache.org/jira/browse/HDFS-11282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796299#comment-15796299
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Arpit Agarwal edited comment on HDFS-11282 at 1/3/17 9:56 PM:
--------------------------------------------------------------
Thanks [~linyiqun]. Comments below.
# The rendered table looks wrong. The {{|}} need to be escaped. See
!metrics-rendered.png|width=900!
# Can you add that enabling per-volume metrics may have a performance impact?
# "Average Time" should be replaced with "Mean Time" in descriptions to be
accurate.
# The description for the count metrics and the rate metric is the same e.g.
TotalMetadataOperations and MetadataOperationRateNumOps. I am not sure that is
correct.
# We can say that metadata operations include stat, list, mkdir, delete, move,
open and posix_fadvise.
# The description _Average time of file io error operations in milliseconds_
could be improved. It measures the mean time in milliseconds from the start of
an operation to hitting a failure (assuming failures were seen on that volume).
was (Author: arpitagarwal):
Thanks [~linyiqun]. Comments below.
# The rendered table looks wrong. The {{|}} need to be escaped. See
!metrics-rendered.png!
# Can you add that enabling per-volume metrics may have a performance impact?
# "Average Time" should be replaced with "Mean Time" in descriptions to be
accurate.
# The description for the count metrics and the rate metric is the same e.g.
TotalMetadataOperations and MetadataOperationRateNumOps. I am not sure that is
correct.
# We can say that metadata operations include stat, list, mkdir, delete, move,
open and posix_fadvise.
# The description _Average time of file io error operations in milliseconds_
could be improved. It measures the mean time in milliseconds from the start of
an operation to hitting a failure (assuming failures were seen on that volume).
> Document the missing metrics of DataNode Volume IO operations
> -------------------------------------------------------------
>
> Key: HDFS-11282
> URL: https://issues.apache.org/jira/browse/HDFS-11282
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: documentation
> Affects Versions: 3.0.0-alpha2
> Reporter: Yiqun Lin
> Assignee: Yiqun Lin
> Priority: Minor
> Attachments: HDFS-11282.001.patch, HDFS-11282.002.patch,
> metrics-rendered.png
>
>
> In HDFS-10959, it added many metrics of datanode volume io opearions. But it
> hasn't been documented. This JIRA addressed on this.
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