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https://issues.apache.org/jira/browse/HBASE-27826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17826761#comment-17826761
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Wellington Chevreuil commented on HBASE-27826:
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Thanks for the headsup, [~zhangduo] and for picking this up, [~prathyu6]!
Summarising my understanding from the discussion:
1) We will define a splitFiles method in StoreFileTracker interface, so that
everywhere we do split logic currently (like in SplitTableRegionProcedure)
would now delegate to the StoreFileTracker implementation;
2) DefaultStoreFileTracker implementation would still create actual ref/link
files in the split daughter regions, whilst FileBasedTracker impl would keep a
link/ref at its metadata only.
3) We would need to change the format for the meta files of FileBasedTracker to
include the parent region location for split daughters "inherited" files.
Seems reasonable to me, looking forward for the design doc/initial PR.
> Region split and merge time while offline is O(n) with respect to number of
> store files
> ---------------------------------------------------------------------------------------
>
> Key: HBASE-27826
> URL: https://issues.apache.org/jira/browse/HBASE-27826
> Project: HBase
> Issue Type: Bug
> Affects Versions: 2.5.4
> Reporter: Andrew Kyle Purtell
> Priority: Major
>
> This is a significant availability issue when HFiles are on S3. =
> HBASE-26079 ({_}Use StoreFileTracker when splitting and merging{_}) changed
> the split and merge table procedure implementations to indirect through the
> StoreFileTracker implementation when selecting HFiles to be merged or split,
> rather than directly listing those using file system APIs. It also changed
> the commit logic in HRegionFileSystem to add the link/ref files on resulting
> split or merged regions to the StoreFileTracker. However, the creation of a
> link file is still a filesystem operation and creating a “file” on S3 can
> take well over a second. If, for example there are 20 store files in a
> region, which is not uncommon, after the region is taken offline for a split
> (or merge) it may require more than 20 seconds to create the link files
> before the results can be brought back online, creating a severe availability
> problem. Splits and merges are supposed to be fast, completing in less than a
> second, certainly less than a few seconds. This has been true when HFiles are
> stored on HDFS only because file creation operations there are nearly
> instantaneous.
> There are two issues but both can be handled with modifications to the store
> file tracker interface and the file based store file tracker implementation.
> When the file based store file file tracker is enabled the HFile links should
> be virtual entities that only exist in the file manifest. We do not require
> physical files in the filesystem to serve as links now. That is the magic of
> the this file tracker, the manifest file replaces requirements to list the
> filesystem.
> Then, when splitting or merging, the HFile links should be collected into a
> list and committed in one batch using a new FILE file tracker interface,
> requiring only one update of the manifest file in S3, bringing the time
> requirement for this operation to O(1) down from O[n].
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