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Arpit Agarwal commented on HADOOP-13738: ---------------------------------------- [~kihwal] that's a good point. The caller should deal with slow checks since a single check can also hang indefinitely. The DN currently serializes disk checks so one slow disk can delay checking the rest. Also it doesn't handle stalled checks. I am testing some changes to fix this in the DataNode and plan to post patches in the next few days. > 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 > > > 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