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https://issues.apache.org/jira/browse/HADOOP-19139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17867188#comment-17867188
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ASF GitHub Bot commented on HADOOP-19139:
-----------------------------------------
saxenapranav commented on code in PR #6699:
URL: https://github.com/apache/hadoop/pull/6699#discussion_r1683874125
##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/ConfigurationKeys.java:
##########
@@ -321,5 +321,21 @@ public static String accountProperty(String property,
String account) {
* @see FileSystem#openFile(org.apache.hadoop.fs.Path)
*/
public static final String FS_AZURE_BUFFERED_PREAD_DISABLE =
"fs.azure.buffered.pread.disable";
+
+ /**
+ * Enable lazy opening of an inputStream. Lazy opening would not call HEAD
call
+ * to get file metadata before creating inputStream. ReadPath API of server
+ * would give the contentLength and eTag which would be used in subsequent
calls
+ * for if-match headers.
+ */
+ public static final String
+ FS_AZURE_INPUT_STREAM_LAZY_OPEN_OPTIMIZATION_ENABLED =
"fs.azure.input.stream.lazy.open.optimization.enabled";
+
+ /**
+ * Enable prefetch on the first read to {@link
org.apache.hadoop.fs.azurebfs.services.AbfsInputStream}.
+ * If disabled, first call would not trigger prefetch. Prefetch would be
switched on
Review Comment:
Good point, have added in
https://github.com/saxenapranav/hadoop/blob/saxenapranav/noGpsForRead/hadoop-tools/hadoop-azure/src/site/markdown/abfs.md#:~:text=fs.azure.input,will%20be%20true.
Information about read ahead is already there below the shared pointer.
> [ABFS]: No GetPathStatus call for opening AbfsInputStream
> ---------------------------------------------------------
>
> Key: HADOOP-19139
> URL: https://issues.apache.org/jira/browse/HADOOP-19139
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Reporter: Pranav Saxena
> Assignee: Pranav Saxena
> Priority: Major
> Labels: pull-request-available
>
> Read API gives contentLen and etag of the path. This information would be
> used in future calls on that inputStream. Prior information of eTag is of not
> much importance.
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