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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7217) Better batching of IBRs
Date Fri, 10 Oct 2014 13:57:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14166874#comment-14166874
] 

Hudson commented on HDFS-7217:
------------------------------

FAILURE: Integrated in Hadoop-Hdfs-trunk #1897 (See [https://builds.apache.org/job/Hadoop-Hdfs-trunk/1897/])
HDFS-7217. Better batching of IBRs. Contributed by Kihwal Lee. (kihwal: rev db71bb54bcc75b71c5841b25ceb03fb0218c6d4f)
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
* hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestIncrementalBlockReports.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPOfferService.java


> Better batching of IBRs
> -----------------------
>
>                 Key: HDFS-7217
>                 URL: https://issues.apache.org/jira/browse/HDFS-7217
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 2.6.0
>
>         Attachments: HDFS-7217.patch
>
>
> After HDFS-2691 (pipeline recovery in HA), the number of IBR(incremental block report)s
have doubled.  Since processing of IBR requires exclusive FSNamesystem write lock, this can
be a source of significant overhead on clusters with high write load.  
> On one of the busy clusters, we have observed 60 to 70 percent of available handlers
being constantly occupied by IBRs. This degrades throughput greatly when compared to 0.23.



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