jojochuang commented on a change in pull request #1028: HDFS-14617 - Improve
fsimage load time by writing sub-sections to the fsimage index
URL: https://github.com/apache/hadoop/pull/1028#discussion_r311837663
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImageFormatProtobuf.java
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@@ -255,14 +345,28 @@ public int compare(FileSummary.Section s1,
FileSummary.Section s2) {
case INODE: {
currentStep = new Step(StepType.INODES);
prog.beginStep(Phase.LOADING_FSIMAGE, currentStep);
- inodeLoader.loadINodeSection(in, prog, currentStep);
+ stageSubSections = getSubSectionsOfName(
+ subSections, SectionName.INODE_SUB);
+ if (loadInParallel && (stageSubSections.size() > 0)) {
+ inodeLoader.loadINodeSectionInParallel(executorService,
+ stageSubSections, summary.getCodec(), prog, currentStep);
+ } else {
+ inodeLoader.loadINodeSection(in, prog, currentStep);
+ }
}
break;
case INODE_REFERENCE:
snapshotLoader.loadINodeReferenceSection(in);
break;
case INODE_DIR:
- inodeLoader.loadINodeDirectorySection(in);
+ stageSubSections = getSubSectionsOfName(
+ subSections, SectionName.INODE_DIR_SUB);
+ if (loadInParallel && stageSubSections.size() > 0) {
Review comment:
you probably need to put a sample fsimage in old format in the resource
directory (hadoop-hdfs-project/hadoop-hdfs/src/test/resources/), and load it
in a unit test
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