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Posted to issues@hbase.apache.org by "Hudson (Jira)" <ji...@apache.org> on 2021/10/02 18:40:00 UTC
[jira] [Commented] (HBASE-24601) Change default Hfile storage
policy from HOT to NONE for HDFS
[ https://issues.apache.org/jira/browse/HBASE-24601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423585#comment-17423585 ]
Hudson commented on HBASE-24601:
--------------------------------
Results for branch branch-2
[build #355 on builds.a.o|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2/355/]: (/) *{color:green}+1 overall{color}*
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> Change default Hfile storage policy from HOT to NONE for HDFS
> -------------------------------------------------------------
>
> Key: HBASE-24601
> URL: https://issues.apache.org/jira/browse/HBASE-24601
> Project: HBase
> Issue Type: Bug
> Components: HFile
> Affects Versions: 2.2.5
> Reporter: dark_num
> Assignee: dark_num
> Priority: Major
> Fix For: 2.5.0, 3.0.0-alpha-2
>
> Attachments: hfile-policy-problem.png
>
>
> The current HBase hfile directory specifies the *HOT* storage strategy by default(`hbase.hstore.blockingStoreFiles` ), which is different from the default value of HDFS *heterogeneous* strategy now(should be empty)
> It should be set to *NONE* like `hbase.wal.storage.policy`'s default value on HBASE-20691, and the reason for modification is the same
> Otherwise, it could have a significant impact because most HDFS Managers doesn't know the default value has been changed to *HOT* by hbase, for example:
> HDFS manger want to set hfile's dir to ONE_SSD for speed up read, they will do:
> {code:java}
> // Set Hbas Hfile dir to ONE_SSD for speed up read
> // The policy that expects all subdirectories to inherit the parent directory by default (empty by default)
> bin/hdfs storagepolicies -setStoragePolicy -path /home/hbase/data -policy ONE_SSD
> bin/hdfs storagepolicies -setStoragePolicy -path /home/hbase/WALs -policy ALL_SSD
> // If we do not change Hbase default setting, we will find this
> bin/hdfs storagepolicies -getStoragePolicy -path /home/hbase/data/hbase/meta/xxxx/info
> return "HOT" instead of "ONE_SSD"{code}
> And here is a pic to show the problem ↑:
> !hfile-policy-problem.png!
> However, if Hfile uses the *HOT* strategy by default, then we will find that the actually stored directory has been set to HOT, then it will *not inherit* the *ONE_SSD* of the parent directory policy, and if we set *NONE* in hbase, this is problem can be avoided
> Unless someone sets other values manually, then we believe the operator knows what he is doing
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