[
https://issues.apache.org/jira/browse/HBASE-3721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ted Yu updated HBASE-3721:
--------------------------
Description:
>From Adam Phelps:
from the logs it looks like <1% of the hfiles we're loading have to be split.
Looking at the code for LoadIncrementHFiles (hbase v0.90.1), I'm actually
thinking our problem is that this code loads the hfiles sequentially. Our
largest table has over 2500 regions and the data being loaded is fairly well
distributed across them, so there end up being around 2500 HFiles for each load
period. At 1-2 seconds per HFile that means the loading process is very time
consuming.
Currently server.bulkLoadHFile() is a blocking call.
We can utilize ExecutorService to achieve better parallelism on multi-core
computer.
New configuration parameter "hbase.loadincremental.threads.max" is introduced
which sets the maximum number of threads for parallel bulk load.
was:
>From Adam Phelps:
from the logs it looks like <1% of the hfiles we're loading have to be split.
Looking at the code for LoadIncrementHFiles (hbase v0.90.1), I'm actually
thinking our problem is that this code loads the hfiles sequentially. Our
largest table has over 2500 regions and the data being loaded is fairly well
distributed across them, so there end up being around 2500 HFiles for each load
period. At 1-2 seconds per HFile that means the loading process is very time
consuming.
Currently server.bulkLoadHFile() is a blocking call.
We can utilize ExecutorService to achieve better parallelism on multi-core
computer.
> Speedup LoadIncrementalHFiles
> -----------------------------
>
> Key: HBASE-3721
> URL: https://issues.apache.org/jira/browse/HBASE-3721
> Project: HBase
> Issue Type: Improvement
> Components: util
> Reporter: Ted Yu
> Assignee: Ted Yu
> Attachments: 3721-v2.txt, 3721-v3.txt, 3721-v4.txt, 3721-v6.patch,
> 3721.txt, LoadIncrementalHFiles.java
>
>
> From Adam Phelps:
> from the logs it looks like <1% of the hfiles we're loading have to be split.
> Looking at the code for LoadIncrementHFiles (hbase v0.90.1), I'm actually
> thinking our problem is that this code loads the hfiles sequentially. Our
> largest table has over 2500 regions and the data being loaded is fairly well
> distributed across them, so there end up being around 2500 HFiles for each
> load period. At 1-2 seconds per HFile that means the loading process is very
> time consuming.
> Currently server.bulkLoadHFile() is a blocking call.
> We can utilize ExecutorService to achieve better parallelism on multi-core
> computer.
> New configuration parameter "hbase.loadincremental.threads.max" is introduced
> which sets the maximum number of threads for parallel bulk load.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
