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Ran 05 Apr 2018 02:01PM UTC

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Committed 05 Apr 2018 02:01PM UTC coverage: 72.448% (+0.05%) from 72.403%

Job # 43.1

Build Type

push

jenkins

Committed by Sijie Guo

Commit Message

ISSUE #1314: Provide a mechanism to allow high priority writes to readonly bookies

Descriptions of the changes in this PR:

*Problem*

Currently we allow fence requests going through readonly bookies, since fence requests are special read requests. However a ledger can only be sealed after it is successfully recovered. If bookies are in readonly, those recovery writes won't go through.

If there is a bookie outage happened (e.g. all bookies are readonly), all ledgers are not able to be sealed. It might be good to have a similar setting like minUsableSizeForIndexFileCreation for recovery writes.

This can improve operability during outage.

*Solution*

- add a setting `minUsableSizeForHighPriorityWrites` to allow accepting high priority writes on readonly bookies.

Master Issue: #1314

Author: Sijie Guo <sijie@apache.org>

Reviewers: Enrico Olivelli <eolivelli@gmail.com>, Matteo Merli <mmerli@apache.org>

This closes #1315 from sijie/allow_high_priority_writes, closes #1314

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