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https://issues.apache.org/jira/browse/HDFS-7725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14486261#comment-14486261
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Hudson commented on HDFS-7725:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #7539 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/7539/])
HDFS-7725. Incorrect 'nodes in service' metrics caused all writes to fail.
Contributed by Ming Ma. (wang: rev 6af0d74a75f0f58d5e92e2e91e87735b9a62bb12)
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DecommissionManager.java
*
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNamenodeCapacityReport.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/HeartbeatManager.java
> Incorrect "nodes in service" metrics caused all writes to fail
> --------------------------------------------------------------
>
> Key: HDFS-7725
> URL: https://issues.apache.org/jira/browse/HDFS-7725
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Ming Ma
> Assignee: Ming Ma
> Attachments: HDFS-7725-2.patch, HDFS-7725-3.patch, HDFS-7725.patch
>
>
> One of our clusters sometimes couldn't allocate blocks from any DNs.
> BlockPlacementPolicyDefault complains with the following messages for all DNs.
> {noformat}
> the node is too busy (load:x > y)
> {noformat}
> It turns out the {{HeartbeatManager}}'s {{nodesInService}} was computed
> incorrectly when admins decomm or recomm dead nodes. Here are two scenarios.
> * Decomm dead nodes. It turns out HDFS-7374 has fixed it; not sure if it is
> intentional. cc / [~zhz], [~andrew.wang], [~atm] Here is the sequence of
> event without HDFS-7374.
> ** Cluster has one live node. nodesInService == 1
> ** The node becomes dead. nodesInService == 0
> ** Decomm the node. nodesInService == -1
> * However, HDFS-7374 introduces another inconsistency when recomm is involved.
> ** Cluster has one live node. nodesInService == 1
> ** The node becomes dead. nodesInService == 0
> ** Decomm the node. nodesInService == 0
> ** Recomm the node. nodesInService == 1
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