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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-16288) HFile intermediate block level indexes might recurse forever creating multi TB files
Date Mon, 01 Aug 2016 18:14:20 GMT

     [ https://issues.apache.org/jira/browse/HBASE-16288?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Enis Soztutar updated HBASE-16288:
----------------------------------
      Resolution: Fixed
    Hadoop Flags: Reviewed
    Release Note: A new hfile configuration "hfile.index.block.min.entries" which defaults
to 16 determines how many entries the hfile index block can have at least. The configuration
which determines how large the index block can be at max (hfile.index.block.max.siz) is ignored
as long as we have fewer than hfile.index.block.min.entries entries. This ensures that multi-level
index does not build up with too many levels. 
          Status: Resolved  (was: Patch Available)

Pushed to 1.1+

> HFile intermediate block level indexes might recurse forever creating multi TB files
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-16288
>                 URL: https://issues.apache.org/jira/browse/HBASE-16288
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>            Priority: Critical
>             Fix For: 2.0.0, 1.3.0, 1.4.0, 1.1.6, 1.2.3
>
>         Attachments: hbase-16288_v1.patch, hbase-16288_v2.patch, hbase-16288_v3.patch,
hbase-16288_v4.patch
>
>
> Mighty [~elserj] was debugging an opentsdb cluster where some region directory ended
up having 5TB+ files under <regiondir>/.tmp/ 
> Further debugging and analysis, we were able to reproduce the problem locally where we
never we recursing in this code path for writing intermediate level indices: 
> {code:title=HFileBlockIndex.java}
> if (curInlineChunk != null) {
>         while (rootChunk.getRootSize() > maxChunkSize) {
>           rootChunk = writeIntermediateLevel(out, rootChunk);
>           numLevels += 1;
>         }
>       }
> {code}
> The problem happens if we end up with a very large rowKey (larger than "hfile.index.block.max.size"
being the first key in the block, then moving all the way to the root-level index building.
We will keep writing and building the next level of intermediate level indices with a single
very-large key. This can happen in flush / compaction / region recovery causing cluster inoperability
due to ever-growing files. 
> Seems the issue was also reported earlier, with a temporary workaround: 
> https://github.com/OpenTSDB/opentsdb/issues/490



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