accumulo-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From joshelser <>
Subject [GitHub] accumulo pull request #224: ACCUMULO-4500 ACCUMULO-96 Added summarization
Date Thu, 09 Mar 2017 19:43:08 GMT
Github user joshelser commented on a diff in the pull request:
    --- Diff: core/src/main/java/org/apache/accumulo/core/client/admin/
    @@ -808,4 +812,64 @@ void setSamplerConfiguration(String tableName, SamplerConfiguration
        * @since 1.8.0
       SamplerConfiguration getSamplerConfiguration(String tableName) throws TableNotFoundException,
AccumuloException, AccumuloSecurityException;
    +  /**
    +   * Entry point for retrieving summaries with optional restrictions.
    +   *
    +   * <p>
    +   * In order to retrieve Summaries, the Accumulo user making the request will need the
{@link TablePermission#GET_SUMMARIES} table permission.
    +   *
    +   * <p>
    +   * Accumulo stores summary data with each file in each tablet. In order to make retrieving
it faster there is a per tablet server cache of summary data. The
    +   * size of this cache is determined by the property {code tserver.cache.summary.size}.
When summary data for a file is not present, it will be retrieved using
    +   * threads on the tserver. The property {@code tserver.summary.retrieval.threads} determines
the max number of threads the tserver will use for this.
    +   *
    +   * <p>
    +   * Since summary data is cached, its important to use the summary selection options
to only read the needed data into the cache.
    +   *
    +   * <p>
    +   * Summary data will be merged on the tablet servers and then in this client process.
Therefore it's important that the required summarizers are on the
    +   * clients classpath.
    +   *
    +   * @since 2.0.0
    +   * @see Summarizer
    +   */
    +  SummaryRetriever getSummaries(String tableName) throws TableNotFoundException, AccumuloException,
    --- End diff --
    Is there a better method name than `getSummaries`? I didn't notice it was strange until
I got to the tests where you have (paraphrasing)
    The `SummaryRetriever` is more like a builder, right?

If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at or file a JIRA ticket
with INFRA.

View raw message