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https://issues.apache.org/jira/browse/HDFS-14401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16826642#comment-16826642
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Rakesh R commented on HDFS-14401:
---------------------------------
Thanks [~PhiloHe] for the good progress. Adding few comments,
# Move log message to respective constructor, that will make the
FsDatasetCache.java more cleaner.
{code:java}
PmemMappableBlockLoader(){
LOG.info("Initializing cache loader: PmemMappableBlockLoader");
}
MemoryMappableBlockLoader(){
LOG.info("Initializing cache loader: MemoryMappableBlockLoader");
}
{code}
# How about using a {{MappableBlockLoaderFactory}} and move
{{#createCacheLoader(DNConf)}} function into that.
{code:java}
MappableBlockLoader loader =
MappableBlockLoaderFactory.getInstance().createCacheLoader(this.getDnConf());
{code}
# Typo - '{{due to unsuccessfully mapping'}} -->to-> '{{due to unsuccessful
mapping'}}.
# Can we make synchronized functions {{long release}} and {{public String
getCachePath}}
# {{maxBytes = pmemDir.getTotalSpace();}}, IMHO, to use
[File#getUsableSpace()|https://docs.oracle.com/javase/7/docs/api/java/io/File.html#getUsableSpace()]
function.
# Remove unused var in PmemVolumeManager.java - {{// private final
UsedBytesCount usedBytesCount;}}
# Its good to use {} instead of string concatenation in log messages. Please
take care all such occurrences in newly writing code.
{code:java}
LOG.info("Added persistent memory - " + volumes[n] +
" with size=" + maxBytes);
to
LOG.info("Added persistent memory - {} with size={}",
volumes[n], maxBytes);
{code}
> Refine the implementation for HDFS cache on SCM
> -----------------------------------------------
>
> Key: HDFS-14401
> URL: https://issues.apache.org/jira/browse/HDFS-14401
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: caching, datanode
> Reporter: Feilong He
> Assignee: Feilong He
> Priority: Major
> Attachments: HDFS-14401.000.patch, HDFS-14401.001.patch,
> HDFS-14401.002.patch, HDFS-14401.003.patch, HDFS-14401.004.patch,
> HDFS-14401.005.patch
>
>
> In this Jira, we will refine the implementation for HDFS cache on SCM, such
> as: 1) Handle full pmem volume in VolumeManager; 2) Refine pmem volume
> selection impl; 3) Clean up MapppableBlockLoader interface; etc.
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