Hexiaoqiao commented on a change in pull request #2918:
URL: https://github.com/apache/hadoop/pull/2918#discussion_r643135023
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/PBImageTextWriter.java
##########
@@ -640,6 +657,19 @@ long getParentId(long id) throws IOException {
private void output(Configuration conf, FileSummary summary,
FileInputStream fin, ArrayList<FileSummary.Section> sections)
throws IOException {
+ ArrayList<FileSummary.Section> allINodeSubSections =
+ getINodeSubSections(sections);
+ if (numThreads > 1 && !parallelOut.equals("-") &&
Review comment:
the same as above comments.
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/PBImageTextWriter.java
##########
@@ -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:
Make sense to me. Leave some nit comment inline.
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/OfflineImageViewerPB.java
##########
@@ -132,6 +133,7 @@ private static Options buildOptions() {
options.addOption("delimiter", true, "");
options.addOption("sp", false, "");
options.addOption("t", "temp", true, "");
+ options.addOption("threads", true, "");
Review comment:
I am concerned that parameter `-threads` will collide with `-t`, and it
could be parsed to `-t hreads` here. It is safe to changes names to another one
to avoid abuse.
##########
File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/PBImageDelimitedTextWriter.java
##########
@@ -146,7 +146,13 @@ public String build() {
PBImageDelimitedTextWriter(PrintStream out, String delimiter,
String tempPath, boolean printStoragePolicy)
throws IOException {
- super(out, delimiter, tempPath);
+ this(out, delimiter, tempPath, printStoragePolicy, 1, "-");
Review comment:
I am confused why we use static string "-" rather than null. any other
consideration?
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
