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Posted to issues@hbase.apache.org by "Hudson (Jira)" <ji...@apache.org> on 2024/10/26 20:45:00 UTC
[jira] [Commented] (HBASE-28934) The HFile Reader creation should not be blocked due to waits for cache initialisation.
[ https://issues.apache.org/jira/browse/HBASE-28934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17893147#comment-17893147 ]
Hudson commented on HBASE-28934:
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Results for branch master
[build #1192 on builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/1192/]: (x) *{color:red}-1 overall{color}*
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details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/1192/General_20Nightly_20Build_20Report/]
(x) {color:red}-1 jdk17 hadoop3 checks{color}
-- For more information [see jdk17 report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/1192/JDK17_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 jdk17 hadoop ${HADOOP_THREE_VERSION} backward compatibility checks{color}
-- For more information [see jdk17 report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/1192/JDK17_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 jdk17 hadoop ${HADOOP_THREE_VERSION} backward compatibility checks{color}
-- For more information [see jdk17 report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/1192/JDK17_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 jdk17 hadoop ${HADOOP_THREE_VERSION} backward compatibility checks{color}
-- For more information [see jdk17 report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/1192/JDK17_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test for 3.3.5 {color}
(/) {color:green}+1 client integration test for 3.3.6 {color}
(/) {color:green}+1 client integration test for 3.4.0 {color}
> The HFile Reader creation should not be blocked due to waits for cache initialisation.
> --------------------------------------------------------------------------------------
>
> Key: HBASE-28934
> URL: https://issues.apache.org/jira/browse/HBASE-28934
> Project: HBase
> Issue Type: Bug
> Components: BucketCache
> Affects Versions: 3.0.0-beta-1, 2.7.0, 2.6.1
> Reporter: Janardhan Hungund
> Assignee: Janardhan Hungund
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.0.0
>
>
> When persistent bucket cache is enabled, bucket cache needs to read and load the persistent cache file contents during region server starting time. This cache initialisation is currently asynchronous. The server restart completes after spawning a thread to initialise the cache.
> When the subsequent HFile readers are created, the current implementation is such that the constructor of the hfile (HFilePreadReader) waits until the cache is initialised. Due to this wait, all client requests to these regions would fail during the whole cache initialisation period, as these regions are not yet online.
> The correct way to handle this is that, the constructors of HFile readers should not wait for cache initialisation. Only the prefetch threads should wait for the cache initialisation.
> Subsequently, any client requests should be served by accessing the underlying file system if the cache is not yet initialised, and a cache miss should be computed in the cache stats.
> Thanks,
> Janardhan
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