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https://issues.apache.org/jira/browse/HBASE-18624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16201162#comment-16201162
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Zach York commented on HBASE-18624:
-----------------------------------
Ajay is out on vacation so I will be picking this up.
[~tedyu] Are you talking about incrementing a counter for each time a
NotServingRegionException is thrown below? Another thing I thought of is that
we could expose how many blocks are evicted as the return of this command
(since that is already exposed via the internal function)
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public void clearBlockCache(final TableName tableName) throws IOException {
+ checkTableExists(tableName);
+ List<Pair<HRegionInfo, ServerName>> pairs =
+ MetaTableAccessor.getTableRegionsAndLocations(connection, tableName);
+ for (Pair<HRegionInfo, ServerName> pair: pairs) {
+ if (pair.getFirst().isOffline()) continue;
+ if (pair.getSecond() == null) continue;
+ try {
+ clearBlockCache(pair.getSecond(), pair.getFirst());
+ } catch (NotServingRegionException e) {
//You want to keep track of how many of these there are?
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Trying to clear block cache for " + pair.getFirst() + ":
" +
+ StringUtils.stringifyException(e));
+ }
+ }
+ }
+ }
> Added support for clearing BlockCache based on table name
> ---------------------------------------------------------
>
> Key: HBASE-18624
> URL: https://issues.apache.org/jira/browse/HBASE-18624
> Project: HBase
> Issue Type: Sub-task
> Affects Versions: 2.0.0, 1.3.0
> Reporter: Ajay Jadhav
> Assignee: Zach York
> Fix For: 2.0.0, 1.4.0
>
> Attachments: HBASE-18624.branch-1.001.patch,
> HBASE-18624.master.001.patch, HBASE-18624.master.002.patch
>
>
> Bulk loading the primary HBase cluster triggers a lot of compactions
> resulting in archival/ creation
> of multiple HFiles. This process will cause a lot of items to become stale in
> replica’s BlockCache.
> This patch will help users to clear the block cache for a given table by
> either using shell or API.
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