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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12423) Ozone: TopN container choosing policy should ignore unnecessary containers
Date Tue, 12 Sep 2017 03:17:00 GMT
Yiqun Lin created HDFS-12423:
--------------------------------

             Summary: 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


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 iterations.



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