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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4414) Region splits by size not being triggered in at least some cases
Date Thu, 15 Sep 2011 03:44:08 GMT

    [ 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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