[YARN-9607] Auto-configuring rollover-size of IFile format for non-appendable filesystems

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.3.0
• Component/s: log-aggregation, yarn
• Assignee: Adam Antal
• Reporter: Adam Antal
• Created: 06/Jun/19 10:02
• Updated: 06/Dec/19 09:24
• Resolved: 06/Dec/19 09:24

Description

In YARN-9525, we made IFile format compatible with remote folders with s3a scheme. In rolling fashioned log-aggregation IFile still fails with the "append is not supported" error message, which is a known limitation of the format by design.

There is a workaround though: setting the rollover size in the configuration of the IFile format, in each rolling cycle a new aggregated log file will be created, thus we eliminated the append from the process. Setting this config globally would cause performance problems in the regular log-aggregation, so I'm suggesting to enforcing this config to zero, if the scheme of the URI is s3a (or any other non-appendable filesystem).

Issue Links

• requires: HADOOP-15691 Add PathCapabilities to FS and FC to complement StreamCapabilities