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https://issues.apache.org/jira/browse/HDFS-7129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14156428#comment-14156428
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Hudson commented on HDFS-7129:
------------------------------
FAILURE: Integrated in Hadoop-Hdfs-trunk #1889 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1889/])
HDFS-7129. Metrics to track usage of memory for writes. (Contributed by Xiaoyu
Yao) (arp: rev 5e8b6973527e5f714652641ed95e8a4509e18cfa)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-6581.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/JMXGet.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/metrics/DataNodeMetrics.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/RamDiskReplicaLruTracker.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/RamDiskReplicaTracker.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/TestLazyPersistFiles.java
> Metrics to track usage of memory for writes
> -------------------------------------------
>
> Key: HDFS-7129
> URL: https://issues.apache.org/jira/browse/HDFS-7129
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode
> Affects Versions: HDFS-6581
> Reporter: Arpit Agarwal
> Assignee: Xiaoyu Yao
> Fix For: 3.0.0
>
> Attachments: HDFS-7129.0.patch, HDFS-7129.1.patch, HDFS-7129.2.patch,
> HDFS-7129.3.patch
>
>
> A few metrics to evaluate feature usage and suggest improvements. Thanks to
> [~sureshms] for some of these suggestions.
> # Number of times a block in memory was read (before being ejected)
> # Average block size for data written to memory tier
> # Time the block was in memory before being ejected
> # Number of blocks written to memory
> # Number of memory writes requested but not satisfied (failed-over to disk)
> # Number of blocks evicted without ever being read from memory
> # Average delay between memory write and disk write (window where a node
> restart could cause data loss).
> # Replicas written to disk by lazy writer
> # Bytes written to disk by lazy writer
> # Replicas deleted by application before being persisted to disk
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