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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (NIFI-527) Persistent Prov Repo should compress write-ahead-log files in chunks
Date Wed, 22 Apr 2015 13:58:00 GMT


ASF subversion and git services commented on NIFI-527:

Commit 4dafd65a2e9296af7a229026fdf99e28b9c53f37 in incubator-nifi's branch refs/heads/improve-prov-performance
from [~markap14]
[;h=4dafd65 ]

NIFI-527: Added unit test to verify backpressure

> Persistent Prov Repo should compress write-ahead-log files in chunks
> --------------------------------------------------------------------
>                 Key: NIFI-527
>                 URL:
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>             Fix For: 0.1.0
>         Attachments: 0001-NIFI-527-Refactored-the-serialization-format-of-the-.patch,
0002-NIFI-527-More-performance-improvements-including-reu.patch, 0003-NIFI-527-Cleaned-up-log-messages.patch,
> Currently when we rollover a prov log, we compress the entire thing. This means that
when we want to jump to a particular offset we have to open a GZIPInputStream and read through
all of the data. If we instead compress the logs in chunks, we can actually jump to a particular
chunk using FileInputStream.skip and then open a GZIPInputStream from there. Currently, this
is by far the biggest bottleneck in the prov repo when doing queries.

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