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https://issues.apache.org/jira/browse/HADOOP-18028?focusedWorklogId=747920&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-747920
]
ASF GitHub Bot logged work on HADOOP-18028:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/Mar/22 18:22
Start Date: 25/Mar/22 18:22
Worklog Time Spent: 10m
Work Description: steveloughran commented on a change in pull request
#3736:
URL: https://github.com/apache/hadoop/pull/3736#discussion_r835515328
##########
File path:
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/read/S3EInputStream.java
##########
@@ -0,0 +1,240 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.hadoop.fs.s3a.read;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.CanSetReadahead;
+import org.apache.hadoop.fs.FSExceptionMessages;
+import org.apache.hadoop.fs.FSInputStream;
+import org.apache.hadoop.fs.StreamCapabilities;
+import org.apache.hadoop.fs.common.Validate;
+import org.apache.hadoop.fs.s3a.S3AInputStream;
+import org.apache.hadoop.fs.s3a.S3AReadOpContext;
+import org.apache.hadoop.fs.s3a.S3ObjectAttributes;
+import org.apache.hadoop.fs.s3a.statistics.S3AInputStreamStatistics;
+import org.apache.hadoop.fs.statistics.IOStatistics;
+import org.apache.hadoop.fs.statistics.IOStatisticsSource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+
+/**
+ * Enhanced {@code InputStream} for reading from S3.
+ *
+ * This implementation provides improved read throughput by asynchronously
prefetching
+ * blocks of configurable size from the underlying S3 file.
+ */
+public class S3EInputStream
Review comment:
i agree that saving time is generally the best action to prioritise, as
if you are running in ec2 your cpu rental is a bigger cost. it does increase
the risk of overloading the IO capacity of a shard in a bucket, but we have
that with the current random IO implementation anyway
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Issue Time Tracking
-------------------
Worklog Id: (was: 747920)
Time Spent: 11h 50m (was: 11h 40m)
> improve S3 read speed using prefetching & caching
> -------------------------------------------------
>
> Key: HADOOP-18028
> URL: https://issues.apache.org/jira/browse/HADOOP-18028
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/s3
> Reporter: Bhalchandra Pandit
> Priority: Major
> Labels: pull-request-available
> Time Spent: 11h 50m
> Remaining Estimate: 0h
>
> I work for Pinterest. I developed a technique for vastly improving read
> throughput when reading from the S3 file system. It not only helps the
> sequential read case (like reading a SequenceFile) but also significantly
> improves read throughput of a random access case (like reading Parquet). This
> technique has been very useful in significantly improving efficiency of the
> data processing jobs at Pinterest.
>
> I would like to contribute that feature to Apache Hadoop. More details on
> this technique are available in this blog I wrote recently:
> [https://medium.com/pinterest-engineering/improving-efficiency-and-reducing-runtime-using-s3-read-optimization-b31da4b60fa0]
>
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