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From Ted Yu <yuzhih...@gmail.com>
Subject Re: How does HBase manage Memstore
Date Sat, 01 Aug 2015 09:11:57 GMT
Here're some other memstore related config parameters:

hbase.regionserver.global.memstore.size
hbase.regionserver.global.memstore.size.lower.limit
hbase.hregion.preclose.flush.size
hbase.hregion.memstore.block.multiplier

hbase.hregion.percolumnfamilyflush.size.lower.bound

The last one is for per column family flush.
You can find their meaning in
either hbase-common/src/main/resources/hbase-default.xml or, in
http://hbase.apache.org/book.html

FYI

On Sat, Aug 1, 2015 at 1:14 AM, Chang Chen <baibaichen@gmail.com> wrote:

> Hi All
>
> How does HBase flush memstore  besides  the configuration in
> [hbase.hregion.memstore.flush.size]? I believe we set flush size to 64M,
> but I find many *small* memstore flush logs as below
>
> 2015-06-25 10:19:09,243 INFO org.apache.hadoop.hbase.regionserver.HRegion:
> Finished memstore flush of ~69.8 K/71520, currentsize=0/0 for region
> user_intent_exp,1696512044,1426251005088.448ddc0071414b6af5729e4476ea35e8.
> in 26ms, sequenceid=18149727777, compaction requested=true
>
> 2015-06-25 10:20:54,428 INFO org.apache.hadoop.hbase.regionserver.HRegion:
> Finished memstore flush of ~6.9 K/7104, currentsize=0/0 for region
> user_intent_exp,472446392,1426251005088.8d6041bd68dd431f5840357a2fd8bce2.
> in 30ms, sequenceid=18149728414, compaction requested=false
>
>
> Is there any other configuration which can affect flush? Will  HTable.close
> cause it happen?
>
> Thanks
> Chang
>

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