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https://issues.apache.org/jira/browse/HADOOP-19645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18011345#comment-18011345
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ASF GitHub Bot commented on HADOOP-19645:
-----------------------------------------
manika137 commented on code in PR #7837:
URL: https://github.com/apache/hadoop/pull/7837#discussion_r2246885435
##########
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsInputStream.java:
##########
@@ -544,7 +555,9 @@ private int readInternal(final long position, final byte[]
b, final int offset,
}
// got nothing from read-ahead, do our own read now
- receivedBytes = readRemote(position, b, offset, length, new
TracingContext(tracingContext));
+ TracingContext tc = new TracingContext(tracingContext);
+ tc.setReadType(ReadType.MISSEDCACHE_READ);
+ receivedBytes = readRemote(position, b, offset, length, tc);
return receivedBytes;
} else {
LOG.debug("read ahead disabled, reading remote");
Review Comment:
Should we add readtype as normal read for this TC as well?
> ABFS: [ReadAheadV2] Improve Metrics for Read Calls to identify type of read
> done.
> ---------------------------------------------------------------------------------
>
> Key: HADOOP-19645
> URL: https://issues.apache.org/jira/browse/HADOOP-19645
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.3.6, 3.4.1
> Reporter: Anuj Modi
> Assignee: Anuj Modi
> Priority: Major
> Labels: pull-request-available
>
> There are a number of ways in which ABFS driver can trigger a network call to
> read data. We need a way to identify what type of read call was made from
> client. Plan is to add an indication for this in already present
> ClientRequestId header.
> Following are types of read we want to identify:
> # Direct Read: Read from a given position in remote file. This will be
> synchronous read
> # Normal Read: Read from current seeked position where read ahead was
> bypassed. This will be synchronous read.
> # Prefetch Read: Read triggered from background threads filling up in memory
> cache. This will be asynchronous read.
> # Missed Cache Read: Read triggered after nothing was received from read
> ahead. This will be synchronous read.
> # Footer Read: Read triggered as part of footer read optimization. This will
> be synchronous.
> # Small File Read: Read triggered as a part of small file read. This will be
> synchronous read.
> We will add another field in the Tracing Header (Client Request Id) for each
> request. We can call this field "Operation Specific Header" very similar to
> how we have "Retry Header" today. As part of this we will only use it for
> read operations keeping it empty for other operations. Moving ahead f we need
> to publish any operation specific info, same header can be used.
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