[
https://issues.apache.org/jira/browse/HDFS-7217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14164632#comment-14164632
]
Kihwal Lee commented on HDFS-7217:
----------------------------------
Precommit is not working correctly.
bq. -1 javadoc
Actually there is no new javadoc warnings. Diff is zero.
bq. -1 core tests. The following test timeouts occurred in
hadoop-hdfs-project/hadoop-hdfs: org.apache.hadoop.hdfs.TestHDFSServerPorts
According to the precommit build log, all test cases in TestHDFSServerPorts
actually passed. There was no test failure.
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
