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https://issues.apache.org/jira/browse/HBASE-2451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12857445#action_12857445
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stack commented on HBASE-2451:
------------------------------
Problem is in our bootstrapping code:
{code}
private void bootstrap() throws IOException {
LOG.info("BOOTSTRAP: creating ROOT and first META regions");
try {
// Bootstrapping, make sure blockcache is off. Else, one will be
// created here in bootstap and it'll need to be cleaned up. Better to
// not make it in first place. Turn off block caching for bootstrap.
// Enable after.
setBlockCaching(HRegionInfo.ROOT_REGIONINFO, false);
setBlockCaching(HRegionInfo.FIRST_META_REGIONINFO, false);
HRegion root = HRegion.createHRegion(HRegionInfo.ROOT_REGIONINFO,
this.rootdir, this.conf);
HRegion meta = HRegion.createHRegion(HRegionInfo.FIRST_META_REGIONINFO,
this.rootdir, this.conf);
// Add first region from the META table to the ROOT region.
HRegion.addRegionToMETA(root, meta);
root.close();
root.getLog().closeAndDelete();
meta.close();
meta.getLog().closeAndDelete();
setBlockCaching(HRegionInfo.ROOT_REGIONINFO, true);
setBlockCaching(HRegionInfo.FIRST_META_REGIONINFO, true);
} catch (IOException e) {
e = RemoteExceptionHandler.checkIOException(e);
LOG.error("bootstrap", e);
throw e;
}
}
{code}
Master has a descriptor where the blockcache is on but the regionserver hosting
the .META. reads what was persisted.
> .META. by-passes cache; BLOCKCACHE=>'false'
> -------------------------------------------
>
> Key: HBASE-2451
> URL: https://issues.apache.org/jira/browse/HBASE-2451
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Priority: Blocker
> Fix For: 0.20.4, 0.20.5, 0.21.0
>
>
> In a new install, if I describe '.META.', it says:
> {code}
> DESCRIPTION
> ENABLED
> {NAME => '.META.', IS_META => 'true', MEMSTORE_FLUSHSIZE => '16384', F true
>
> AMILIES => [{NAME => 'historian', COMPRESSION => 'NONE', VERSIONS => '
>
> 2147483647', TTL => '604800', BLOCKSIZE => '8192', IN_MEMORY => 'false
>
> ', BLOCKCACHE => 'false'}, {NAME => 'info', COMPRESSION => 'NONE', VER
>
> SIONS => '10', TTL => '2147483647', BLOCKSIZE => '8192', IN_MEMORY =>
>
> 'false', BLOCKCACHE => 'true'}]}
> {code}
> BLOCKCACHE is 'true' for the 'info' family (Yes historian is still in 0.20
> branch).
> But, if I add logging to hfile and storefile and store, blockcache is 'false'
> -- there is no cache constructed for use by the hfile.
> This is killing cluster performance.
> It looks like a problem parsing the 'true' value in columnfamily. I'll put
> up a patch in the morning. Meantime, marking as blocker on 0.20.4.
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