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https://issues.apache.org/jira/browse/HBASE-20691?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yu Li updated HBASE-20691:
--------------------------
Affects Version/s: (was: 1.5.0)
Hadoop Flags: Incompatible change,Reviewed (was: Incompatible change)
Release Note: After HBASE-20691 we have changed the default setting of
hbase.wal.storage.policy from "HOT" back to "NONE" which means we defer the
policy to HDFS. This fixes the problem of release 2.0.0 that the storage policy
of WAL directory will defer to HDFS and may not be "HOT" even if you explicitly
set hbase.wal.storage.policy to "HOT"
> Storage policy should allow deferring to HDFS
> ---------------------------------------------
>
> Key: HBASE-20691
> URL: https://issues.apache.org/jira/browse/HBASE-20691
> Project: HBase
> Issue Type: Bug
> Components: Filesystem Integration, wal
> Affects Versions: 2.0.0
> Reporter: Sean Busbey
> Assignee: Yu Li
> Priority: Blocker
> Fix For: 2.1.0, 1.5.0, 2.0.2
>
> Attachments: HBASE-20691.branch-1.patch,
> HBASE-20691.branch-1.v2.patch, HBASE-20691.branch-1.v2.patch,
> HBASE-20691.patch, HBASE-20691.v2.patch, HBASE-20691.v3.patch,
> HBASE-20691.v4.patch, HBASE-20691.v5.patch, HBASE-20691.v6.patch,
> HBASE-20691.v7.patch, HBASE-20691.v8.patch
>
>
> In HBase 1.1 - 1.4 we can defer storage policy decisions to HDFS by using
> "NONE" as the storage policy in hbase configs.
> As described on this [dev@hbase thread "WAL storage policies and interactions
> with Hadoop admin
> tools."|https://lists.apache.org/thread.html/d220726fab4bb4c9e117ecc8f44246402dd97bfc986a57eb22311117@%3Cdev.hbase.apache.org%3E]
> we no longer have that option in 2.0.0 and 1.5.0 (as the branch is now).
> Additionally, we can't set the policy to HOT in the event that HDFS has
> changed the policy for a parent directory of our WALs.
> We should put back that ability. Presuming this is done by re-adopting the
> "NONE" placeholder variable, we need to ensure that value doesn't get passed
> to HDFS APIs. Since it isn't a valid storage policy attempting to use it will
> cause a bunch of logging churn (which will be a regression of the problem
> HBASE-18118 sought to fix).
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