jhungund commented on code in PR #5856:
URL: https://github.com/apache/hbase/pull/5856#discussion_r1582729929
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hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFilePreadReader.java:
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@@ -40,8 +41,13 @@ public HFilePreadReader(ReaderContext context, HFileInfo
fileInfo, CacheConfig c
final MutableBoolean shouldCache = new MutableBoolean(true);
- // Initialize HFileInfo object with metadata for caching decisions
- fileInfo.initMetaAndIndex(this);
+ DataTieringManager dataTieringManager = DataTieringManager.getInstance();
+ if (dataTieringManager != null) {
+ // Initialize HFileInfo object with metadata for caching decisions.
+ // Initialize the metadata only if the data-tiering is enabled.
+ // If not, the metadata will be initialized later.
+ fileInfo.initMetaAndIndex(this);
+ }
Review Comment:
This check is to avoid any changes to the old functionality. We had observed
that this line does introduce some performance regression leading to a unit
test failure. We keep the old behaviour to initialise the metadata at the
original location when data-tiering is not enabled.
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