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https://issues.apache.org/jira/browse/HDFS-7217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14165323#comment-14165323
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Daryn Sharp commented on HDFS-7217:
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+1 Definitely a needed change. If possible, it would be nice for a test to
ensure the receiving block IBRs are batched although it's probably very
difficult and may warrant a separate jira.
> 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
> 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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