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Posted to issues@ozone.apache.org by "Aravindan Vijayan (Jira)" <ji...@apache.org> on 2021/04/15 05:06:00 UTC
[jira] [Comment Edited] (HDDS-4839) RocksDB statistics not exposed
on Ozone DN
[ https://issues.apache.org/jira/browse/HDDS-4839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17321909#comment-17321909 ]
Aravindan Vijayan edited comment on HDDS-4839 at 4/15/21, 5:05 AM:
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[~jwminton] Yes, that is expected since RocksDB instances are created on the datanode through the container create command. A container is created (when there are no open containers currently) whenever you write data. Datanodes have *1 RocksDB instance per container*.
was (Author: avijayan):
[~jwminton] Yes, that is expected since RocksDB instances are created on the datanode through the container create command. A container is created (when there are no open containers currently) whenever you write data. Datanodes have *1 RocksDB instance per conrtainer*.
> RocksDB statistics not exposed on Ozone DN
> ------------------------------------------
>
> Key: HDDS-4839
> URL: https://issues.apache.org/jira/browse/HDDS-4839
> Project: Apache Ozone
> Issue Type: Bug
> Components: Ozone Datanode
> Affects Versions: 1.0.0
> Reporter: Wei-Chiu Chuang
> Assignee: Jasen Minton
> Priority: Major
>
> Setting ozone.metastore.rocksdb.statistics = ALL, I can find the rocksdb stats exposed in OM JMX
> {noformat}
> "name" : "Hadoop:service=Ozone,name=RocksDbStore,dbName=om.db",
> {noformat}
> but the entry is not found on DN if I try to enable this property on a DN. Initial hunch is that the tocksdb stats is created per DN, and DN has many DBs. When one DB is closed, the corresponding JMX entry is removed.
>
> This bug is similar to HDDS-4722.
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