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https://issues.apache.org/jira/browse/HDFS-13610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16530191#comment-16530191
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Chao Sun commented on HDFS-13610:
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Thanks [~xkrogen]! A few of comments (mostly nits):
1. In {{JournaledEditsCache}}, do we need the check: {{lowestTxnId < 0}}? seems
the cache is already initialized in constructor.
2. nit: Can we define a static variable such as {{INVALID_LAYOUT_VERSION}} to
store the {{Integer.MAX_VALUE}}?
3. nit: {{Journal.LOG.info(logMsg.toString());}}: the {{toString}} is not
necessary?
4. Why we need {{getJournaledEditsCache()}} in {{JournalTestUtil}}? can we
replace it with {{journal.getJournaledEditsCache();}}?
5. nit: Can we also update {{JournaledEditsCache}} to add an empty line between
the Java doc and method parameters?
6. nit: in {{JournalTestUtil}}, maybe remove the extra empty line after
{{package org.apache.hadoop.hdfs.qjournal.server;}}?
> [Edit Tail Fast Path Pt 4] Cleanup: integration test, documentation, remove
> unnecessary dummy sync
> --------------------------------------------------------------------------------------------------
>
> Key: HDFS-13610
> URL: https://issues.apache.org/jira/browse/HDFS-13610
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, journal-node, namenode
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Priority: Major
> Attachments: HDFS-13610-HDFS-12943.000.patch,
> HDFS-13610-HDFS-12943.001.patch, HDFS-13610-HDFS-12943.002.patch,
> HDFS-13610-HDFS-12943.003.patch
>
>
> See HDFS-13150 for full design.
> This JIRA is targeted at cleanup tasks:
> * Add in integration testing. We can expand {{TestStandbyInProgressTail}}
> * Documentation in HDFSHighAvailabilityWithQJM
> * Remove the dummy sync added as part of HDFS-10519; it is unnecessary since
> now in-progress tailing does not rely on the JN committedTxnId
> A few bugs are also fixed:
> * Due to changes in HDFS-13609 to enable use of the RPC mechanism whenever
> inProgressOK is true, there were codepaths which would use the RPC mechanism
> even when dfs.ha.tail-edits.in-progress was false, meaning that the JNs did
> not enable the cache. Update the QJM logic to only use selectRpcInputStreams
> if this config is true.
> * Fix a false error logged when the layout version changes
> * Fix the logging when a layout version change occurs to avoid printing out a
> placeholder value (Integer.MAX_VALUE)
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