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Arpit Agarwal commented on HADOOP-13738: ---------------------------------------- Thanks [~anu]. Yeah we should hold off committing for a few days to let Kihwal and Xiaoyu comment. bq. As for the I/O getting stuck in a disk, I am hoping the normal I/O on that datanode would have caught that issue and errors already propagated. So I am okay with not solving that in DiskChecker. Many IO failures in the DataNode trigger DiskChecker. So if the disk is failing it should eventually affect DiskChecker. > DiskChecker should perform some disk IO > --------------------------------------- > > Key: HADOOP-13738 > URL: https://issues.apache.org/jira/browse/HADOOP-13738 > Project: Hadoop Common > Issue Type: Improvement > Reporter: Arpit Agarwal > Assignee: Arpit Agarwal > Attachments: HADOOP-13738.01.patch, HADOOP-13738.02.patch, > HADOOP-13738.03.patch, HADOOP-13738.04.patch > > > DiskChecker can fail to detect total disk/controller failures indefinitely. > We have seen this in real clusters. DiskChecker performs simple > permissions-based checks on directories which do not guarantee that any disk > IO will be attempted. > A simple improvement is to write some data and flush it to the disk. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org