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Posted to hdfs-issues@hadoop.apache.org by "Xiaoqiao He (Jira)" <ji...@apache.org> on 2021/03/07 09:48:00 UTC
[jira] [Updated] (HDFS-15882) Fix incorrectly initializing
RandomAccessFile based on configuration options
[ https://issues.apache.org/jira/browse/HDFS-15882?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiaoqiao He updated HDFS-15882:
-------------------------------
Description:
`rw` Open for reading and writing. If the file does not already exist then an attempt will be made to create it.
`rws` Require that every update to the file's content or metadata be written synchronously to the underlying storage device.
From the literal meaning of this variable `shouldSyncWritesAndSkipFsync`, we should use `rw` when `shouldSyncWritesAndSkipFsync` is true.
We use SATA disk to store the journal node's data. It's not effective for improving RPC performance whether the `shouldSyncWritesAndSkipFsync` variable is true or false. it's caused by initializing RandomAccessFile incorrectly.
> Fix incorrectly initializing RandomAccessFile based on configuration options
> ----------------------------------------------------------------------------
>
> Key: HDFS-15882
> URL: https://issues.apache.org/jira/browse/HDFS-15882
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Xie Lei
> Priority: Major
>
> `rw` Open for reading and writing. If the file does not already exist then an attempt will be made to create it.
> `rws` Require that every update to the file's content or metadata be written synchronously to the underlying storage device.
> From the literal meaning of this variable `shouldSyncWritesAndSkipFsync`, we should use `rw` when `shouldSyncWritesAndSkipFsync` is true.
> We use SATA disk to store the journal node's data. It's not effective for improving RPC performance whether the `shouldSyncWritesAndSkipFsync` variable is true or false. it's caused by initializing RandomAccessFile incorrectly.
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