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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12043) Add counters for block re-replication
Date Sat, 01 Jul 2017 00:53:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12043?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16070912#comment-16070912
] 

Hudson commented on HDFS-12043:
-------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11959 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/11959/])
Revert "HDFS-12043. Add counters for block re-replication. Contributed (arp: rev a2f0cbd92f7e90909cf817c261a5fae13a9695b4)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestPendingReconstruction.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/NameNodeMetrics.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/PendingReconstructionBlocks.java
HDFS-12043. Add counters for block re-replication. Contributed by Chen (arp: rev 6a9dc5f44b0c7945e3e9a56248cd4ff80d5c8f0f)
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/PendingReconstructionBlocks.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/NameNodeMetrics.java
* (edit) hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/blockmanagement/TestPendingReconstruction.java


> Add counters for block re-replication
> -------------------------------------
>
>                 Key: HDFS-12043
>                 URL: https://issues.apache.org/jira/browse/HDFS-12043
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Chen Liang
>            Assignee: Chen Liang
>             Fix For: 3.0.0-alpha4
>
>         Attachments: HDFS-12043.001.patch, HDFS-12043.002.patch, HDFS-12043.003.patch,
HDFS-12043.004.patch, HDFS-12043-branch-2.005.patch
>
>
> We occasionally see that the under-replicated block count is not going down quickly enough.
We've made at least one fix to speed up block replications (HDFS-9205) but we need better
insight into the current state and activity of the block re-replication logic. For example,
we need to understand whether is it because re-replication is not making forward progress
at all, or is it because new under-replicated blocks are being added faster.
> We should include additional metrics:
> # Cumulative number of blocks that were successfully replicated. 
> # Cumulative number of re-replications that timed out.
> # Cumulative number of blocks that were dequeued for re-replication but not scheduled
e.g. because they were invalid, or under-construction or replication was postponed.
>  
> The growth rate of of the above metrics will make it clear whether block replication
is making forward progress and if not then provide potential clues about why it is stalled.
> Thanks [~arpitagarwal] for the offline discussions.



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