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Wei-Chiu Chuang commented on HDFS-15945: ---------------------------------------- Thanks a lot for reporting the issue. Make sense to me. > DataNodes with zero capacity and zero blocks should be decommissioned > immediately > --------------------------------------------------------------------------------- > > Key: HDFS-15945 > URL: https://issues.apache.org/jira/browse/HDFS-15945 > Project: Hadoop HDFS > Issue Type: Bug > Reporter: Takanobu Asanuma > Assignee: Takanobu Asanuma > Priority: Major > Labels: pull-request-available > Time Spent: 10m > Remaining Estimate: 0h > > Such as when there is a storage problem, DataNode capacity and block count > sometimes become zero. > When we tried to decommission those DataNodes, we ran into an issue that the > decommission did not complete because the NameNode had not received their > first block report. > {noformat} > INFO blockmanagement.DatanodeAdminManager > (DatanodeAdminManager.java:startDecommission(183)) - Starting decommission of > 127.0.0.1:58343 > [DISK]DS-a29de094-2b19-4834-8318-76cda3bd86bf:NORMAL:127.0.0.1:58343 with 0 > blocks > INFO blockmanagement.BlockManager > (BlockManager.java:isNodeHealthyForDecommissionOrMaintenance(4587)) - Node > 127.0.0.1:58343 hasn't sent its first block report. > INFO blockmanagement.DatanodeAdminDefaultMonitor > (DatanodeAdminDefaultMonitor.java:check(258)) - Node 127.0.0.1:58343 isn't > healthy. It needs to replicate 0 more blocks. Decommission In Progress is > still in progress. > {noformat} > To make matters worse, even if we stopped these DataNodes afterward, they > remained in a dead&decommissioning state until NameNode restarted. > I think those DataNodes should be decommissioned immediately even if NameNode > hasn't recived the first block report. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org