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https://issues.apache.org/jira/browse/HDFS-7217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14165387#comment-14165387
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Yongjun Zhang commented on HDFS-7217:
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Hi [~kihwal], thanks for addressing my question. I think it's a good change.
> 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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