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From "Eric Newton (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-786) Look into walog space usage
Date Fri, 05 Oct 2012 20:00:04 GMT


Eric Newton commented on ACCUMULO-786:

I got the 36 bytes down to 11, for small entries, and performed some tests writing write-ahead
logs.  I'm seeing a 10-20% improvement in write speed.  I am not seeing much of an improvement
in ContinuousIngest, however.

In addition, I'm using a system timestamp in Mutation, which is separate from the timestamp
in the serialized ColumnUpdate.  That means the tablet server isn't deserializing the ColumnUpdates
just to set the timestamps.  That will save the work of creating lots of small objects, just
to throw them all away.

> Look into walog space usage
> ---------------------------
>                 Key: ACCUMULO-786
>                 URL:
>             Project: Accumulo
>          Issue Type: Task
>            Reporter: Keith Turner
>             Fix For: 1.5.0
> I was experimenting with write ahead log write performance and noticed that when I wrote
1G of data that the walog was 1.5G.

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