[ https://issues.apache.org/jira/browse/HBASE-27805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zheng Wang updated HBASE-27805: ------------------------------- Summary: The chunk created by mslab may cause memory fragement and lead to fullgc (was: The chunk created by mslab may cause memory fragement and leading to fullgc) > The chunk created by mslab may cause memory fragement and lead to fullgc > ------------------------------------------------------------------------ > > Key: HBASE-27805 > URL: https://issues.apache.org/jira/browse/HBASE-27805 > Project: HBase > Issue Type: Improvement > Components: regionserver > Reporter: Zheng Wang > Assignee: Zheng Wang > Priority: Major > Attachments: chunksize-2047k.png, chunksize-2048k-fullgc.png > > > The default size of chunk is 2m, when we use G1, if heapRegionSize equals 4m, > these chunks are allocated as humongous objects, exclusively allocating one > region, then the remaining 2m become memory fragement. > Lots of memory fragement may leading to fullgc even if the percent of used > heap not high enough. > I have tested to reduce the chunk size to 2047k(2m-1k, a bit lesser than half > of heapRegionSize), there was no repeat of the above. > BTW, in g1, humongous objects are objects larger or equal the size of half a > region. > -- This message was sent by Atlassian Jira (v8.20.10#820010)