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https://issues.apache.org/jira/browse/PHOENIX-7389?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Viraj Jasani resolved PHOENIX-7389.
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Resolution: Duplicate
> Phoenix metadata updates should fail-fast for noisy neighbor
> ------------------------------------------------------------
>
> Key: PHOENIX-7389
> URL: https://issues.apache.org/jira/browse/PHOENIX-7389
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 5.2.0, 5.1.3
> Reporter: Viraj Jasani
> Priority: Major
>
> Phoenix is high scale, low latency, high throughput multi-tenant database.
> The multi-tenancy can come with its own set of challenges, one of which is
> noisy neighbour problem. Single client can initiate very high num of tenant
> view updates (e.g. drop views, create views, create index etc) while all
> other clients are making RPC calls to SYSTEM.CATALOG for retrieving the
> updated PTable objects. With more metadata update calls, it is possible for
> more RPC calls to get stuck while waiting for HBase RowLock to be acquired.
> We have also seen high memory pressure with increasing num of metadata update
> APIs.
>
> HBase RowLock by default has 30s of timeout for acquiring lock, which is
> configurable by {_}hbase.rowlock.wait.duration{_}. While this is applicable
> at the cluster level, Phoenix metadata RPC calls are expected to have much
> lower timeout value for the RowLock acquisition because metadata updates and
> reads are expected to be extremely low latency operations. If this is not the
> case, we are essentially blocking some client from getting either enough RPC
> handlers to execute getTable RPC call or causing significant delays with
> ongoing getTable calls.
> While HBASE-28797 has a proposal to introduce new Region API for acquiring
> RowLock, Phoenix already has its own RowLock implementation and its already
> being used by getTable RPC calls while protecting metadata server side cache
> updates (PHOENIX-7363).
> The proposal of this Jira is to eliminate using HBase RowLock for all Phoenix
> metadata operations and use Phoenix RowLock with default timeout of 3 sec.
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