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https://issues.apache.org/jira/browse/HADOOP-17250?focusedWorklogId=618453&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-618453
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ASF GitHub Bot logged work on HADOOP-17250:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 04/Jul/21 20:27
Start Date: 04/Jul/21 20:27
Worklog Time Spent: 10m
Work Description: snvijaya commented on a change in pull request #3110:
URL: https://github.com/apache/hadoop/pull/3110#discussion_r663552686
##########
File path:
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsInputStream.java
##########
@@ -207,6 +215,28 @@ public synchronized int read(final byte[] b, final int
off, final int len) throw
}
incrementReadOps();
do {
+
+ // limit is the maximum amount of data present in buffer.
+ // fCursor is the current file pointer. Thus maximum we can
+ // go back and read from buffer is fCursor - limit.
+ // There maybe case that we read less than requested data.
+ long bytesPresentInBuffer = fCursor - limit;
Review comment:
Rename bytesPresentInBuffer to filePosAtStartOfBuffer
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Issue Time Tracking
-------------------
Worklog Id: (was: 618453)
Time Spent: 4h 10m (was: 4h)
> ABFS: Random read perf improvement
> ----------------------------------
>
> Key: HADOOP-17250
> URL: https://issues.apache.org/jira/browse/HADOOP-17250
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.3.0
> Reporter: Sneha Vijayarajan
> Assignee: Mukund Thakur
> Priority: Major
> Labels: abfsactive, pull-request-available
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> Random read if marginally read ahead was seen to improve perf for a TPCH
> query.
>
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