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https://issues.apache.org/jira/browse/NIFI-527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14507116#comment-14507116
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ASF subversion and git services commented on NIFI-527:
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Commit a1027aeae51826ca22234e373ecd207c66e72ab7 in incubator-nifi's branch
refs/heads/improve-prov-performance from [~markap14]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-nifi.git;h=a1027ae ]
NIFI-527: Refactored the serialization format of the persistent prov repo to
use compression blocks and index them
> Persistent Prov Repo should compress write-ahead-log files in chunks
> --------------------------------------------------------------------
>
> Key: NIFI-527
> URL: https://issues.apache.org/jira/browse/NIFI-527
> 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,
> 0004-NIFI-527-Added-unit-test-to-verify-backpressure.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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