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https://issues.apache.org/jira/browse/HDFS-13607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16501070#comment-16501070
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Konstantin Shvachko commented on HDFS-13607:
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Hey [~xkrogen].
# Did you look at {{LightWeightCache}} / {{LightWeightGSet}}? It worked better
for us in the past than {{ConcurrentHashMap}} or {{TreeMap}}.
# Would {{lowestTxnId}} sound better than {{initialTxnId}}? I understand it's
the opposite to your {{highestTxnId}}. Otherwise it is hard to distinguish
between "initial" and "starting" TxnId.
# I think it is better to convert comments to private members into JavaDoc
comments. It is not public, so it wont mater for documentations, but it still
good to see definitions when hoovering over the variables in IDE.
# Do we need {{serialVersionUID}} for {{CacheMissException}}?
> [Edit Tail Fast Path Pt 1] Enhance JournalNode with an in-memory cache of
> recent edit transactions
> --------------------------------------------------------------------------------------------------
>
> Key: HDFS-13607
> URL: https://issues.apache.org/jira/browse/HDFS-13607
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, journal-node
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
> Attachments: HDFS-13607-HDFS-12943.000.patch,
> HDFS-13607-HDFS-12943.001.patch, HDFS-13607-HDFS-12943.002.patch
>
>
> See HDFS-13150 for full design.
> This JIRA is to add the in-memory cache of recent edit transactions on the
> JournalNode. This JIRA does not include accesses to this cache.
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