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https://issues.apache.org/jira/browse/HDFS-7056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Plamen Jeliazkov updated HDFS-7056:
-----------------------------------
Attachment: HDFS-7056.patch
Attaching refreshed HDFS-7056 and combined HDFS-3107 & HDFS-7056 patch to
address [~cmccabe]'s comments.
As for interaction with recoverLease the basic answer is it will behave the
same as create and append (since the file will no longer be under construction
after truncate completes).
Otherwise, since the last block of the file is under recovery and the file is
under construction, the recoverLease operation will renew the lease and trigger
block recovery again, just like it does with a file that has not completed
regular block recovery.
I believe the unit tests even show this -- I encourage you to look through them.
> Snapshot support for truncate
> -----------------------------
>
> Key: HDFS-7056
> URL: https://issues.apache.org/jira/browse/HDFS-7056
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Konstantin Shvachko
> Assignee: Plamen Jeliazkov
> Attachments: HDFS-3107-HDFS-7056-combined.patch,
> HDFS-3107-HDFS-7056-combined.patch, HDFS-3107-HDFS-7056-combined.patch,
> HDFS-3107-HDFS-7056-combined.patch, HDFS-3107-HDFS-7056-combined.patch,
> HDFS-7056.patch, HDFS-7056.patch, HDFS-7056.patch, HDFS-7056.patch,
> HDFS-7056.patch, HDFS-7056.patch, HDFSSnapshotWithTruncateDesign.docx
>
>
> Implementation of truncate in HDFS-3107 does not allow truncating files which
> are in a snapshot. It is desirable to be able to truncate and still keep the
> old file state of the file in the snapshot.
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