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Weiwei Yang commented on HDFS-12423: ------------------------------------ Hi [~linyiqun] Thanks for the patch, it looks good to me. Just one suggestion, since {{ContainerStatus}} are sorted, can we stop looking for next entry if we met a container has 0 number of pending deletion blocks? So topN policy returns us at most N containers, but it could be any size <N. Please let me know if this makes sense. Thanks > Ozone: TopN container choosing policy should ignore unnecessary containers > -------------------------------------------------------------------------- > > Key: HDFS-12423 > URL: https://issues.apache.org/jira/browse/HDFS-12423 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: ozone > Affects Versions: HDFS-7240 > Reporter: Yiqun Lin > Assignee: Yiqun Lin > Labels: ozoneMerge > Attachments: HDFS-12423-HDFS-7240.001.patch > > > TopN container choosing policy should ignore unnecessary containers. > Currently TopN policy selects specified count of containers but not check the > number of pending deletion blocks. So there is a chance there will be some > unnecessary containers being chosen. That is say we will choose some > containers that don't include any pending deletion blocks. The related output: > {noformat} > 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy: > Select container c7a85e6e-3528-45d1-8063-cd7fec114545 for block deletion, > pending deletion blocks num: 1. > 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy: > Select container 1d163265-8d47-4ed3-845f-f7d3eb569b83 for block deletion, > pending deletion blocks num: 0. > 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy: > Select container 21017018-be32-44e6-9f62-e7fc9f6a6021 for block deletion, > pending deletion blocks num: 0. > 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy: > Select container 4cccadc8-ef5e-466d-bd9e-5b9705f8748c for block deletion, > pending deletion blocks num: 0. > 17/09/11 02:58:30 INFO impl.TopNOrderedContainerDeletionChoosingPolicy: > Select container 55b11be9-f16f-4620-a310-07c9be3bbfee for block deletion, > pending deletion blocks num: 0. > {noformat} > We should ignore these containers which pending deletion blocks num is 0, > this can reduce some unnecessary block-deletion iterations. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org