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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2011/09/15 05:44:08 UTC
[jira] [Commented] (HBASE-4414) Region splits by size not being
triggered in at least some cases
[ https://issues.apache.org/jira/browse/HBASE-4414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13105090#comment-13105090 ]
stack commented on HBASE-4414:
------------------------------
Seems like stuff is not hooked up. We used to check splits after a compaction before. Undoing split following on from a compaction is probably what we want but there is no ongoing split check w/o your patch. Checking on flush seems as good a time as any to look for split.
> Region splits by size not being triggered in at least some cases
> ----------------------------------------------------------------
>
> Key: HBASE-4414
> URL: https://issues.apache.org/jira/browse/HBASE-4414
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.0
> Reporter: Gary Helmling
> Priority: Blocker
> Fix For: 0.92.0
>
> Attachments: HBASE-4414.patch
>
>
> We seem to have lost the triggering of region splits by size somewhere in trunk.
> Running a simple test to load data only:
> 1. create 'usertable', 'f1' in hbase shell
> 2. run a YCSB load of 10M records
> I wind up with a single region containing all records, around 13GB, despite max region size being configured to 640MB.
> {noformat}
> ip-10-160-217-155.us-west-1.compute.internal:8120 1316045713501
> requestsPerSecond=0, numberOfOnlineRegions=1, usedHeapMB=1544, maxHeapMB=2962
> usertable,,1316045755455.1e11a9f71072113258942e03dabaa468.
> numberOfStores=1, numberOfStorefiles=16, storefileUncompressedSizeMB=13611, storefileSizeMB=13621, compressionRatio=1.0007, memstoreSizeMB=50, storefileIndexSizeMB=0, readRequestsCount=0, writeRequestsCount=1930, rootIndexSizeKB=108, totalStaticIndexSizeKB=10511, totalStaticBloomSizeKB=0, totalCompactingKVs=3356000, currentCompactedKVs=3356000, compactionProgressPct=1.0
> {noformat}
> As best I can tell, the changes introduced in HBASE-3797 and HBASE-1476 dropped some cases where we were triggering region splits when we didn't compact.
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