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https://issues.apache.org/jira/browse/HDFS-13529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang reassigned HDFS-13529:
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Assignee: He Xiaoqiao
> Fix default trash policy emptier trigger time correctly
> -------------------------------------------------------
>
> Key: HDFS-13529
> URL: https://issues.apache.org/jira/browse/HDFS-13529
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.1.0, 2.7.6, 3.2.0, 2.9.2, 2.8.5
> Reporter: He Xiaoqiao
> Assignee: He Xiaoqiao
> Priority: Major
> Attachments: HDFS-13529-trunk.001.patch
>
>
> Trash emptier is designed to auto trigger at UTC 00:00, however I am confused
> all the time that it usually triggers at a few minutes even half a hour after
> UTC 00:00 actually in our production cluster.
> The main reason is default policy emptier thread sleep more time than as
> expect, since it does not consider the delete operation time cost itself.
> especially for a large cluster, auto trash cleaner may cost dozens of minutes.
> The right way is that gets current time {{now}} before calculate {{end}} time.
> {code:java}
> long now = Time.now();
> while (true) {
> end = ceiling(now, emptierInterval);
> try { // sleep for interval
> Thread.sleep(end - now);
> } catch (InterruptedException e) {
> break; // exit on interrupt
> }
> try {
> now = Time.now();
> ...... // delete trash checkpoint
> } catch (Exception e) {
> LOG.warn("RuntimeException during Trash.Emptier.run(): ", e);
> }
> }
> {code}
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