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Posted to issues@hbase.apache.org by "Andrew Purtell (JIRA)" <ji...@apache.org> on 2018/03/21 00:20:00 UTC
[jira] [Updated] (HBASE-19024) Configurable default durability for
synchronous WAL
[ https://issues.apache.org/jira/browse/HBASE-19024?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrew Purtell updated HBASE-19024:
-----------------------------------
Summary: Configurable default durability for synchronous WAL (was: provide a configurable option to hsync WAL edits to the disk for better durability)
> Configurable default durability for synchronous WAL
> ---------------------------------------------------
>
> Key: HBASE-19024
> URL: https://issues.apache.org/jira/browse/HBASE-19024
> Project: HBase
> Issue Type: Improvement
> Components: wal
> Environment:
> Reporter: Vikas Vishwakarma
> Assignee: Harshal Jain
> Priority: Critical
> Fix For: 3.0.0, 2.1.0, 1.5.0
>
> Attachments: HBASE-19024-master.v10.patch, HBASE-19024.branch-1.2.001.patch, HBASE-19024.branch-1.2.002.patch, HBASE-19024.branch-1.2.003.patch, HBASE-19024.branch-1.2.004.patch, HBASE-19024.branch-1.2.005.patch, branch-1.branch-1.patch, branch-1.v1.branch-1.patch, master.patch, master.v2.patch, master.v3.patch, master.v5.patch, master.v5.patch, master.v6.patch, master.v9.patch
>
>
> At present we do not have an option to hsync WAL edits to the disk for better durability. In our local tests we see 10-15% latency impact of using hsync instead of hflush which is not very high.
> We should have a configurable option to hysnc WAL edits instead of just sync/hflush which will call the corresponding API on the hadoop side. Currently HBase handles both SYNC_WAL and FSYNC_WAL as the same calling FSDataOutputStream sync/hflush on the hadoop side. This can be modified to let FSYNC_WAL call hsync on the hadoop side instead of sync/hflush. We can keep the default value to sync as the current behavior and hsync can be enabled based on explicit configuration.
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