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https://issues.apache.org/jira/browse/HDFS-11789?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060002#comment-16060002
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Hudson commented on HDFS-11789:
-------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11909 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/11909/])
HDFS-11789. Maintain Short-Circuit Read Statistics. Contributed by (arp: rev
6d116ffad23b470f8e9ca131d8e89cbbbb4378d7)
* (add)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestBlockReaderIoProvider.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/DfsClientConf.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/BlockReaderLocal.java
* (add)
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/client/impl/TestBlockReaderLocalMetrics.java
* (add)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/metrics/BlockReaderLocalMetrics.java
* (edit)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java
* (add)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/metrics/package-info.java
* (add)
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/metrics/BlockReaderIoProvider.java
> Maintain Short-Circuit Read Statistics
> --------------------------------------
>
> Key: HDFS-11789
> URL: https://issues.apache.org/jira/browse/HDFS-11789
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Reporter: Hanisha Koneru
> Assignee: Hanisha Koneru
> Fix For: 3.0.0-alpha4
>
> Attachments: HDFS-11789.001.patch, HDFS-11789.002.patch,
> HDFS-11789.003.patch, HDFS-11789.004.patch, HDFS-11789.005.patch
>
>
> If a disk or controller hardware is faulty then short-circuit read requests
> can stall indefinitely while reading from the file descriptor. Currently
> there is no way to detect when short-circuit read requests are slow or
> blocked.
> This Jira proposes that each BlockReaderLocal maintain read statistics while
> it is active by measuring the time taken for a pre-determined fraction of
> read requests. These per-reader stats can be aggregated into global stats
> when the reader is closed. The aggregate statistics can be exposed via JMX.
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