flush_compact.xml
代码语言：javascript复制 <!-- 一个store里面允许存的hfile的个数，超过这个个数会被写到新的一个hfile里面 也即是每个region的每个列族对应的memstore在fulsh为hfile的时候，默认情况下当超过3个hfile的时候就会
对这些文件进行合并重写为一个新文件，设置个数越大可以减少触发合并的时间，但是每次合并的时间就会越长 -->
<property>
<name>hbase.hstore.compactionThreshold</name>
<value>3</value>
<description>
If more than this number of HStoreFiles in any one HStore
(one HStoreFile is written per flush of memstore) then a compaction
is run to rewrite all HStoreFiles files as one. Larger numbers
put off compaction but when it runs, it takes longer to complete.
</description>
</property>
<!-- 每个minor compaction操作的 允许的最大hfile文件上限 -->
<property>
<name>hbase.hstore.compaction.max</name>
<value>10</value>
<description>Max number of HStoreFiles to compact per 'minor'
compaction.</description>
</property>
<!-- regionServer的全局memstore的大小，超过该大小会触发flush到磁盘的操作,默认是堆大小的40%,而且regionserver级别的
flush会阻塞客户端读写 -->
<property>
<name>hbase.regionserver.global.memstore.size</name>
<value></value>
<description>Maximum size of all memstores in a region server before
new
updates are blocked and flushes are forced. Defaults to 40% of heap (0.4).
Updates are blocked and flushes are forced until size of all
memstores
in a region server hits
hbase.regionserver.global.memstore.size.lower.limit.
The default value in this configuration has been intentionally left
emtpy in order to
honor the old hbase.regionserver.global.memstore.upperLimit property if
present.
</description>
</property>
<!-- 内存中的文件在自动刷新之前能够存活的最长时间，默认是1h -->
<property>
<name>hbase.regionserver.optionalcacheflushinterval</name>
<value>3600000</value>
<description>
Maximum amount of time an edit lives in memory before being automatically
flushed.
Default 1 hour. Set it to 0 to disable automatic flushing.
</description>
</property>
<!-- 单个region里memstore的缓存大小，超过那么整个HRegion就会flush,默认128M -->
<property>
<name>hbase.hregion.memstore.flush.size</name>
<value>134217728</value>
<description>
Memstore will be flushed to disk if size of the memstore
exceeds this number of bytes. Value is checked by a thread that runs
every hbase.server.thread.wakefrequency.
</description>
</property> 
