zhengchenyu opened a new pull request #3105: URL: https://github.com/apache/hadoop/pull/3105
When I speed up the decommission, I found that some datanode's io is busy, then I found host's load is very high, and ten thousands data transfer thread are running. Then I find log like below. ``` # 启动线程的日志 2021-06-08 13:42:37,620 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(10.201.4.49:9866, datanodeUuid=6c55b7cb-f8ef-445b-9cca-d82b5b077ed1, infoPort=9864, infoSecurePort=0, ipcPort=9867, storageInfo=lv=-57;cid=CID-37e80bd5-733a-4d7b-ba3d-b46269573c72;nsid=215490653;c=1584525570797) Starting thread to transfer BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611 to 10.201.7.52:9866 2021-06-08 13:52:36,345 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(10.201.4.49:9866, datanodeUuid=6c55b7cb-f8ef-445b-9cca-d82b5b077ed1, infoPort=9864, infoSecurePort=0, ipcPort=9867, storageInfo=lv=-57;cid=CID-37e80bd5-733a-4d7b-ba3d-b46269573c72;nsid=215490653;c=1584525570797) Starting thread to transfer BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611 to 10.201.7.31:9866 2021-06-08 14:02:37,197 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: DatanodeRegistration(10.201.4.49:9866, datanodeUuid=6c55b7cb-f8ef-445b-9cca-d82b5b077ed1, infoPort=9864, infoSecurePort=0, ipcPort=9867, storageInfo=lv=-57;cid=CID-37e80bd5-733a-4d7b-ba3d-b46269573c72;nsid=215490653;c=1584525570797) Starting thread to transfer BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611 to 10.201.16.50:9866 # 发送完成的标记 2021-06-08 13:54:08,134 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: DataTransfer, at bd-tz1-hadoop-004049.zeus.lianjia.com:9866: Transmitted BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611 (numBytes=7457424) to /10.201.7.52:9866 2021-06-08 14:10:47,170 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: DataTransfer, at bd-tz1-hadoop-004049.zeus.lianjia.com:9866: Transmitted BP-852924019-10.201.1.32-1584525570797:blk_-9223372036449848858_30963611 (numBytes=7457424) to /10.201.16.50:9866 ``` You will see last datatranfser thread was done on 13:54:08, but next datatranfser was start at 13:52:36. If datatranfser was not done in 10min(pending timeout + check interval), then next datatranfser for same block will be running. Then disk and network are heavy. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
