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https://issues.apache.org/jira/browse/HDFS-17577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17865285#comment-17865285
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ASF GitHub Bot commented on HDFS-17577:
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liangyu-1 commented on PR #6935:
URL: https://github.com/apache/hadoop/pull/6935#issuecomment-2224320693
> Thanks @liangyu-1 for your report and PR. What about to invoke the
following interface and set flag to `CreateFlag.IGNORE_CLIENT_LOCALITY`.
>
>
https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java#L1275-L1284
@Hexiaoqiao thanks for your reply, I think it's a good idea and I have
resubmitted my code that invokes the interface and replace the createFlag.
`CreateFlag.IGNORE_CLIENT_LOCALITY` helps the cluster to be more even and
invoke the interface increased code scalability.
> Add Support for CreateFlag.NO_LOCAL_WRITE in File Creation to Manage Disk
> Space and Network Load in Labeled YARN Nodes
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-17577
> URL: https://issues.apache.org/jira/browse/HDFS-17577
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: dfsclient
> Reporter: liang yu
> Priority: Major
> Labels: pull-request-available
> Attachments: 6D939050-0BC4-4B17-A6A3-A1EBBD60338D.png
>
>
> {*}Description{*}: I am currently using Apache Flink to write files into
> Hadoop. The Flink application runs on a labeled YARN queue. During operation,
> it has been observed that the local disks on these labeled nodes get filled
> up quickly, and the network load is significantly high. This issue arises
> because Hadoop prioritizes writing files to the local node first, and the
> number of these labeled nodes is quite limited.
>
> {*}Problem{*}: The current behavior leads to inefficient disk space
> utilization and high network traffic on these few labeled nodes, which could
> potentially affect the performance and reliability of the application. As
> shown in the picture, the host I circled have a average net_bytes_sent speed
> 1.2GB/s while the others are just 50MB/s, this imbalance in network and disk
> space nearly destroyed the whole cluster.
> !6D939050-0BC4-4B17-A6A3-A1EBBD60338D.png|width=901,height=257!
>
> {*}Implementation{*}: The implementation would involve adding an
> configuration _dfs.client.write.no_local_write_ to support the
> {{CreateFlag.NO_LOCAL_WRITE}} during the file creation process in Hadoop's
> file system APIs. This will provide flexibility to applications like Flink
> running in labeled queues to opt for non-local writes when necessary.
>
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