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https://issues.apache.org/jira/browse/YARN-4265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092772#comment-15092772
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Mingliang Liu commented on YARN-4265:
-------------------------------------
Hi [~djp] and [~gtCarrera9],
{quote}
For HDFS, any file update should reflect the modification time to parent
directory. Any exception case here?
{quote}
For creating/moving files in an existing directory, the modification time of
the parent directory will be updated. Refer to [code
here|https://github.com/apache/hadoop/blob/9b8e50b424d060e16c1175b1811e7abc476e2468/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java#L1058-L1058].
However, should this jira consider appending to an existing file, the
modification time of the parent directory will not be updated. Refer to [code
here|https://github.com/apache/hadoop/blob/ab56fcdb1219d03713b408dd3a95d7405635254d/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirAppendOp.java#L77-L77].
Thanks.
> Provide new timeline plugin storage to support fine-grained entity caching
> --------------------------------------------------------------------------
>
> Key: YARN-4265
> URL: https://issues.apache.org/jira/browse/YARN-4265
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: timelineserver
> Reporter: Li Lu
> Assignee: Li Lu
> Attachments: YARN-4265-trunk.001.patch, YARN-4265-trunk.002.patch,
> YARN-4265-trunk.003.patch, YARN-4265-trunk.004.patch,
> YARN-4265.YARN-4234.001.patch, YARN-4265.YARN-4234.002.patch
>
>
> To support the newly proposed APIs in YARN-4234, we need to create a new
> plugin timeline store. The store may have similar behavior as the
> EntityFileTimelineStore proposed in YARN-3942, but cache date in cache id
> granularity, instead of application id granularity. Let's have this storage
> as a standalone one, instead of updating EntityFileTimelineStore, to keep the
> existing store (EntityFileTimelineStore) stable.
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