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https://issues.apache.org/jira/browse/HDFS-14117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819336#comment-16819336
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Daryn Sharp commented on HDFS-14117:
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It's a big patch and caught my eye because we are adding support for an
alternate hdfs trash path and this will of course complicate everything.
Anyway, the RBF is attempting to be too smart. It should know nothing about
the trash. The predecessor to httpfs (hdfsproxy) had all kinds of issues
because it tried to be smart instead of proxying the call through as-is. Very
subtle race conditions cropped up that were hard to debug.
Why not require the overlapping mount points to have a trash dir and then do
the fan-out rename?
Is this going to play nicely with EZ trashes?
> RBF: We can only delete the files or dirs of one subcluster in a cluster with
> multiple subclusters when trash is enabled
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14117
> URL: https://issues.apache.org/jira/browse/HDFS-14117
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: venkata ramkumar
> Priority: Major
> Labels: RBF
> Attachments: HDFS-14117-HDFS-13891.001.patch,
> HDFS-14117-HDFS-13891.002.patch, HDFS-14117-HDFS-13891.003.patch,
> HDFS-14117-HDFS-13891.004.patch, HDFS-14117-HDFS-13891.005.patch,
> HDFS-14117-HDFS-13891.006.patch, HDFS-14117-HDFS-13891.007.patch,
> HDFS-14117-HDFS-13891.008.patch, HDFS-14117-HDFS-13891.009.patch,
> HDFS-14117-HDFS-13891.010.patch, HDFS-14117-HDFS-13891.011.patch,
> HDFS-14117-HDFS-13891.012.patch, HDFS-14117-HDFS-13891.013.patch,
> HDFS-14117-HDFS-13891.014.patch, HDFS-14117-HDFS-13891.015.patch,
> HDFS-14117-HDFS-13891.016.patch, HDFS-14117-HDFS-13891.017.patch,
> HDFS-14117-HDFS-13891.018.patch, HDFS-14117-HDFS-13891.019.patch,
> HDFS-14117-HDFS-13891.020.patch, HDFS-14117.001.patch, HDFS-14117.002.patch,
> HDFS-14117.003.patch, HDFS-14117.004.patch, HDFS-14117.005.patch
>
>
> When we delete files or dirs in hdfs, it will move the deleted files or dirs
> to trash by default.
> But in the global path we can only mount one trash dir /user. So we mount
> trash dir /user of the subcluster ns1 to the global path /user. Then we can
> delete files or dirs of ns1, but when we delete the files or dirs of another
> subcluser, such as hacluster, it will be failed.
> h1. Mount Table
> ||Global path||Target nameservice||Target path||Order||Read
> only||Owner||Group||Permission||Quota/Usage||Date Modified||Date Created||
> |/test|hacluster2|/test| | |securedn|users|rwxr-xr-x|[NsQuota: -/-, SsQuota:
> -/-]|2018/11/29 14:37:42|2018/11/29 14:37:42|
> |/tmp|hacluster1|/tmp| | |securedn|users|rwxr-xr-x|[NsQuota: -/-, SsQuota:
> -/-]|2018/11/29 14:37:05|2018/11/29 14:37:05|
> |/user|hacluster2,hacluster1|/user|HASH| |securedn|users|rwxr-xr-x|[NsQuota:
> -/-, SsQuota: -/-]|2018/11/29 14:42:37|2018/11/29 14:38:20|
> commands:
> {noformat}
> 1./opt/HAcluater_ram1/install/hadoop/router/bin> ./hdfs dfs -ls /test/.
> 18/11/30 11:00:47 WARN util.NativeCodeLoader: Unable to load native-hadoop
> library for your platform... using builtin-java classes where applicable
> Found 1 items
> -rw-r--r-- 3 securedn supergroup 8081 2018-11-30 10:56 /test/hdfs.cmd
> 2./opt/HAcluater_ram1/install/hadoop/router/bin> ./hdfs dfs -ls /tmp/.
> 18/11/30 11:00:40 WARN util.NativeCodeLoader: Unable to load native-hadoop
> library for your platform... using builtin-java classes where applicable
> Found 1 items
> -rw-r--r-- 3 securedn supergroup 6311 2018-11-30 10:57 /tmp/mapred.cmd
> 3../opt/HAcluater_ram1/install/hadoop/router/bin> ./hdfs dfs -rm
> /tmp/mapred.cmd
> 18/11/30 11:01:02 WARN util.NativeCodeLoader: Unable to load native-hadoop
> library for your platform... using builtin-java classes where applicable
> rm: Failed to move to trash: hdfs://router/tmp/mapred.cmd: rename destination
> parent /user/securedn/.Trash/Current/tmp/mapred.cmd not found.
> 4./opt/HAcluater_ram1/install/hadoop/router/bin> ./hdfs dfs -rm /test/hdfs.cmd
> 18/11/30 11:01:20 WARN util.NativeCodeLoader: Unable to load native-hadoop
> library for your platform... using builtin-java classes where applicable
> 18/11/30 11:01:22 INFO fs.TrashPolicyDefault: Moved:
> 'hdfs://router/test/hdfs.cmd' to trash at:
> hdfs://router/user/securedn/.Trash/Current/test/hdfs.cmd
> {noformat}
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