HDFS-7697. Mark the PB OIV tool as experimental. Contributed by Lei (Eddy) Xu.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -885,6 +885,8 @@ Release 2.7.0 - UNRELEASED
     HDFS-7722. DataNode#checkDiskError should also remove Storage when error
     is found. (Lei Xu via Colin P. McCabe)
 
+    HDFS-7697. Mark the PB OIV tool as experimental. (Lei Xu via wheat9)
+
     BREAKDOWN OF HDFS-7584 SUBTASKS AND RELATED JIRAS
 
       HDFS-7720. Quota by Storage Type API, tools and ClientNameNode

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/OfflineImageViewerPB.java

@@ -65,7 +65,7 @@ public class OfflineImageViewerPB {
       + "    -step defines the granularity of the distribution. (2MB by default)\n"
       + "  * Web: Run a viewer to expose read-only WebHDFS API.\n"
       + "    -addr specifies the address to listen. (localhost:5978 by default)\n"
-      + "  * Delimited: Generate a text file with all of the elements common\n"
+      + "  * Delimited (experimental): Generate a text file with all of the elements common\n"
       + "    to both inodes and inodes-under-construction, separated by a\n"
       + "    delimiter. The default delimiter is \\t, though this may be\n"
       + "    changed via the -delimiter argument.\n"
@@ -80,10 +80,10 @@ public class OfflineImageViewerPB {
       + "-p,--processor <arg>   Select which type of processor to apply\n"
       + "                       against image file. (XML|FileDistribution|Web|Delimited)\n"
       + "                       (Web by default)\n"
-      + "-delimiter <arg>       Delimiting string to use with Delimited processor\n"
+      + "-delimiter <arg>       Delimiting string to use with Delimited processor.  \n"
       + "-t,--temp <arg>        Use temporary dir to cache intermediate result to generate\n"
       + "                       Delimited outputs. If not set, Delimited processor constructs\n"
-      + "                       the namespace in memory before outputting text."
+      + "                       the namespace in memory before outputting text.\n"
       + "-h,--help              Display usage information and exit\n";
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsImageViewer.md

@@ -55,6 +55,11 @@ The Offline Image Viewer provides several output processors:
     and numFiles is the number of files form the image which size falls
     in this segment.
 
+4. Delimited (experimental): Generate a text file with all of the elements
+   common to both inodes and inodes-under-construction, separated by a
+   delimiter. The default delimiter is \t, though this may be changed via
+   the -delimiter argument.
+
 Usage
 -----
 
@@ -137,6 +142,8 @@ Options
 | `-addr` *address* | Specify the address(host:port) to listen. (localhost:5978 by default). This option is used with Web processor. |
 | `-maxSize` *size* | Specify the range [0, maxSize] of file sizes to be analyzed in bytes (128GB by default). This option is used with FileDistribution processor. |
 | `-step` *size* | Specify the granularity of the distribution in bytes (2MB by default). This option is used with FileDistribution processor. |
+| `-delimiter` *arg* | Delimiting string to use with Delimited processor. |
+| `-t`\|`--temp` *temporary dir* | Use temporary dir to cache intermediate result to generate Delimited outputs. If not set, Delimited processor constructs the namespace in memory before outputting text. |
 | `-h`\|`--help` | Display the tool usage and help information and exit. |
 
 Analyzing Results