[
https://issues.apache.org/jira/browse/HADOOP-11867?focusedWorklogId=711131&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-711131
]
ASF GitHub Bot logged work on HADOOP-11867:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 19/Jan/22 07:01
Start Date: 19/Jan/22 07:01
Worklog Time Spent: 10m
Work Description: mukund-thakur commented on a change in pull request
#3499:
URL: https://github.com/apache/hadoop/pull/3499#discussion_r787397645
##########
File path:
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/AbstractContractVectoredReadTest.java
##########
@@ -0,0 +1,291 @@
+package org.apache.hadoop.fs.contract;
+
+import org.apache.hadoop.fs.FSDataInputStream;
+import org.apache.hadoop.fs.FileRange;
+import org.apache.hadoop.fs.FileRangeImpl;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.fs.impl.FutureIOSupport;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.EOFException;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.function.IntFunction;
+
+import org.assertj.core.api.Assertions;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import static org.apache.hadoop.fs.contract.ContractTestUtils.createFile;
+
+@RunWith(Parameterized.class)
+public abstract class AbstractContractVectoredReadTest extends
AbstractFSContractTestBase {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(AbstractContractVectoredReadTest.class);
+
+ public static final int DATASET_LEN = 1024;
+ private static final byte[] DATASET = ContractTestUtils.dataset(DATASET_LEN,
'a', 32);
+ private static final String VECTORED_READ_FILE_NAME = "vectored_file.txt";
+ private static final String VECTORED_READ_FILE_1MB_NAME =
"vectored_file_1M.txt";
+ private static final byte[] DATASET_MB = ContractTestUtils.dataset(1024 *
1024, 'a', 256);
+
+
+ private final IntFunction<ByteBuffer> allocate;
+
+ private final String bufferType;
+
+ @Parameterized.Parameters
Review comment:
Nice thanks
--
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.
To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
Issue Time Tracking
-------------------
Worklog Id: (was: 711131)
Time Spent: 10h 40m (was: 10.5h)
> FS API: Add a high-performance vectored Read to FSDataInputStream API
> ---------------------------------------------------------------------
>
> Key: HADOOP-11867
> URL: https://issues.apache.org/jira/browse/HADOOP-11867
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs, fs/azure, fs/s3, hdfs-client
> Affects Versions: 3.0.0
> Reporter: Gopal Vijayaraghavan
> Assignee: Mukund Thakur
> Priority: Major
> Labels: performance, pull-request-available
> Time Spent: 10h 40m
> Remaining Estimate: 0h
>
> The most significant way to read from a filesystem in an efficient way is to
> let the FileSystem implementation handle the seek behaviour underneath the
> API to be the most efficient as possible.
> A better approach to the seek problem is to provide a sequence of read
> locations as part of a single call, while letting the system schedule/plan
> the reads ahead of time.
> This is exceedingly useful for seek-heavy readers on HDFS, since this allows
> for potentially optimizing away the seek-gaps within the FSDataInputStream
> implementation.
> For seek+read systems with even more latency than locally-attached disks,
> something like a {{readFully(long[] offsets, ByteBuffer[] chunks)}} would
> take of the seeks internally while reading chunk.remaining() bytes into each
> chunk (which may be {{slice()}}ed off a bigger buffer).
> The base implementation can stub in this as a sequence of seeks + read() into
> ByteBuffers, without forcing each FS implementation to override this in any
> way.
--
This message was sent by Atlassian Jira
(v8.20.1#820001)
---------------------------------------------------------------------
To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: common-issues-h...@hadoop.apache.org
