Hexiaoqiao commented on a change in pull request #2918:
URL: https://github.com/apache/hadoop/pull/2918#discussion_r615238591
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/PBImageTextWriter.java
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@@ -649,14 +679,123 @@ private void output(Configuration conf, FileSummary
summary,
is = FSImageUtil.wrapInputStreamForCompression(conf,
summary.getCodec(), new BufferedInputStream(new LimitInputStream(
fin, section.getLength())));
- outputINodes(is);
+ INodeSection s = INodeSection.parseDelimitedFrom(is);
+ LOG.info("Found {} INodes in the INode section", s.getNumInodes());
+ int count = outputINodes(is, out);
+ LOG.info("Outputted {} INodes.", count);
}
}
afterOutput();
long timeTaken = Time.monotonicNow() - startTime;
LOG.debug("Time to output inodes: {}ms", timeTaken);
}
+ /**
+ * STEP1: Multi-threaded process sub-sections
+ * Given n (1<n<=k) threads to process k sections,
+ * E.g. 10 sections and 4 threads, grouped as follows:
+ * |---------------------------------------------------------------|
+ * | (0 1 2) (3 4 5) (6 7) (8 9) |
+ * | thread[0] thread[1] thread[2] thread[3] |
+ * |---------------------------------------------------------------|
+ *
+ * STEP2: Merge files.
+ */
+ private void outputInParallel(Configuration conf, FileSummary summary,
Review comment:
It is a great idea to improve OIV performance, but it seems only
considering INODE_SUB section now, right? Actually there are also some other
subsections, such as INODE_REFERENCE_SUB, INODE_DIR_SUB, SNAPSHOT_DIFF_SUB. I
think we could process them using the same way.
cc @sodonnel @jojochuang any ideas for this improvement?
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