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https://issues.apache.org/jira/browse/PHOENIX-7253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17823492#comment-17823492
]
ASF GitHub Bot commented on PHOENIX-7253:
-----------------------------------------
dbwong commented on PR #1848:
URL: https://github.com/apache/phoenix/pull/1848#issuecomment-1978220959
Please check the JIRA notes prior to merging this as we want to make sure
the cache is used as often as possible or be aware of the possible perf
impacts...
> Perf improvement for non-full scan queries on large table
> ---------------------------------------------------------
>
> Key: PHOENIX-7253
> URL: https://issues.apache.org/jira/browse/PHOENIX-7253
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 5.2.0, 5.1.3
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Critical
> Fix For: 5.2.0, 5.1.4
>
>
> Any considerably large table with more than 100k regions can give problematic
> performance if we access all region locations from meta for the given table
> before generating parallel or sequential scans for the given query. The perf
> impact can really hurt range scan queries.
> Consider a table with hundreds of thousands of tenant views. Unless the query
> is strict point lookup, any query on any tenant view would end up retrieving
> region locations of all regions of the base table. In case if IOException is
> thrown by HBase client during any region location lookup in meta, we only
> perform single retry.
> Proposal:
> # All non point lookup queries should only retrieve region locations that
> cover the scan boundary. Avoid fetching all region locations of the base
> table.
> # Make retries configurable with higher default value.
>
> Sample stacktrace from the multiple failures observed:
> {code:java}
> java.sql.SQLException: ERROR 1102 (XCL02): Cannot get all table regions.Stack
> trace: java.sql.SQLException: ERROR 1102 (XCL02): Cannot get all table
> regions.
> at
> org.apache.phoenix.exception.SQLExceptionCode$Factory$1.newException(SQLExceptionCode.java:620)
> at
> org.apache.phoenix.exception.SQLExceptionInfo.buildException(SQLExceptionInfo.java:229)
> at
> org.apache.phoenix.query.ConnectionQueryServicesImpl.getAllTableRegions(ConnectionQueryServicesImpl.java:781)
> at
> org.apache.phoenix.query.DelegateConnectionQueryServices.getAllTableRegions(DelegateConnectionQueryServices.java:87)
> at
> org.apache.phoenix.query.DelegateConnectionQueryServices.getAllTableRegions(DelegateConnectionQueryServices.java:87)
> at
> org.apache.phoenix.iterate.DefaultParallelScanGrouper.getRegionBoundaries(DefaultParallelScanGrouper.java:74)
> at
> org.apache.phoenix.iterate.BaseResultIterators.getRegionBoundaries(BaseResultIterators.java:587)
> at
> org.apache.phoenix.iterate.BaseResultIterators.getParallelScans(BaseResultIterators.java:936)
> at
> org.apache.phoenix.iterate.BaseResultIterators.getParallelScans(BaseResultIterators.java:669)
> at
> org.apache.phoenix.iterate.BaseResultIterators.<init>(BaseResultIterators.java:555)
> at
> org.apache.phoenix.iterate.SerialIterators.<init>(SerialIterators.java:69)
> at org.apache.phoenix.execute.ScanPlan.newIterator(ScanPlan.java:278)
> at
> org.apache.phoenix.execute.BaseQueryPlan.iterator(BaseQueryPlan.java:374)
> at
> org.apache.phoenix.execute.BaseQueryPlan.iterator(BaseQueryPlan.java:222)
> at
> org.apache.phoenix.execute.BaseQueryPlan.iterator(BaseQueryPlan.java:217)
> at
> org.apache.phoenix.execute.BaseQueryPlan.iterator(BaseQueryPlan.java:212)
> at
> org.apache.phoenix.jdbc.PhoenixStatement$1.call(PhoenixStatement.java:370)
> at
> org.apache.phoenix.jdbc.PhoenixStatement$1.call(PhoenixStatement.java:328)
> at org.apache.phoenix.call.CallRunner.run(CallRunner.java:53)
> at
> org.apache.phoenix.jdbc.PhoenixStatement.executeQuery(PhoenixStatement.java:328)
> at
> org.apache.phoenix.jdbc.PhoenixStatement.executeQuery(PhoenixStatement.java:320)
> at
> org.apache.phoenix.jdbc.PhoenixPreparedStatement.executeQuery(PhoenixPreparedStatement.java:188)
> ...
> ...
> Caused by: java.io.InterruptedIOException: Origin: InterruptedException
> at
> org.apache.hadoop.hbase.util.ExceptionUtil.asInterrupt(ExceptionUtil.java:72)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.takeUserRegionLock(ConnectionImplementation.java:1129)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.locateRegionInMeta(ConnectionImplementation.java:994)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.locateRegion(ConnectionImplementation.java:895)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.locateRegion(ConnectionImplementation.java:881)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.locateRegion(ConnectionImplementation.java:851)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.getRegionLocation(ConnectionImplementation.java:730)
> at
> org.apache.phoenix.query.ConnectionQueryServicesImpl.getAllTableRegions(ConnectionQueryServicesImpl.java:766)
> ... 254 more
> Caused by: java.lang.InterruptedException
> at
> java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireNanos(AbstractQueuedSynchronizer.java:982)
> at
> java.base/java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireNanos(AbstractQueuedSynchronizer.java:1288)
> at
> java.base/java.util.concurrent.locks.ReentrantLock.tryLock(ReentrantLock.java:424)
> at
> org.apache.hadoop.hbase.client.ConnectionImplementation.takeUserRegionLock(ConnectionImplementation.java:1117)
> ... 264 more {code}
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