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https://issues.apache.org/jira/browse/HADOOP-17195?focusedWorklogId=480908&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-480908
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ASF GitHub Bot logged work on HADOOP-17195:
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Author: ASF GitHub Bot
Created on: 09/Sep/20 16:19
Start Date: 09/Sep/20 16:19
Worklog Time Spent: 10m
Work Description: steveloughran opened a new pull request #2294:
URL: https://github.com/apache/hadoop/pull/2294
This is the successor to #2179
1. ABFS Store creates a single threadpool, configurable with fixed size or
multiple of cores
1. each output stream is given its own semaphored pool which limits the
access that stream has to the pool
To actually defend against OOMs the per-stream queue length is what needs to
be managed; looking at the patch it still has the problem of #2179: you need
one buffer per pending upload in the the pools.
Ultimately the S3A Connector fixed this by going to disk buffering by
default. A more performant design might be to have a blocking byte buffer
factory which limits the #of buffers which the streams can request, so putting
an upper bound on the amount of memory which a single ABFS store instance can
demand.
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Issue Time Tracking
-------------------
Worklog Id: (was: 480908)
Remaining Estimate: 0h
Time Spent: 10m
> Intermittent OutOfMemory error while performing hdfs CopyFromLocal to abfs
> ---------------------------------------------------------------------------
>
> Key: HADOOP-17195
> URL: https://issues.apache.org/jira/browse/HADOOP-17195
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/azure
> Affects Versions: 3.3.0
> Reporter: Mehakmeet Singh
> Assignee: Bilahari T H
> Priority: Major
> Labels: abfsactive
> Time Spent: 10m
> Remaining Estimate: 0h
>
> OutOfMemory error due to new ThreadPools being made each time
> AbfsOutputStream is created. Since threadPool aren't limited a lot of data is
> loaded in buffer and thus it causes OutOfMemory error.
> Possible fixes:
> - Limit the number of ThreadCounts while performing hdfs copyFromLocal (Using
> -t property).
> - Reducing OUTPUT_BUFFER_SIZE significantly which would limit the amount of
> buffer to be loaded in threads.
> - Don't create new ThreadPools each time AbfsOutputStream is created and
> limit the number of ThreadPools each AbfsOutputStream could create.
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