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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-17021) Use RingBuffer to reduce the contention in AsyncFSWAL
Date Fri, 04 Nov 2016 13:30:58 GMT

     [ https://issues.apache.org/jira/browse/HBASE-17021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Duo Zhang updated HBASE-17021:
    Attachment: HBASE-17021.patch

Use ringbuffer instead of ArrayDeque in AsyncFSWAL to reduce contention.

The rolling logic is also reimplemented. Now we will only wait for the ack of all out-going
appends, will not try to write out all the pending appends before rolling.

Unify AsyncFSWAL.Payload to RingBufferTruck, and also add tracing for AsyncFSWAL.append.

Fix a simple bug that we do not reset numEntries after rolling.

I set the default WAL to asyncfs in the patch. Just want to see the precommit test result
to find out bugs. Will revert to filesystem when commit.

[~stack] [~ram_krish], PTAL. Thanks.

> Use RingBuffer to reduce the contention in AsyncFSWAL
> -----------------------------------------------------
>                 Key: HBASE-17021
>                 URL: https://issues.apache.org/jira/browse/HBASE-17021
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>    Affects Versions: 2.0.0
>            Reporter: Duo Zhang
>             Fix For: 2.0.0
>         Attachments: HBASE-17021.patch
> The WALPE result in HBASE-16890 shows that with disruptor's RingBuffer we can get a better

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