[hbase] branch branch-2.5 updated: HBASE-26590 Hbase-client Meta lookup performance regression between hbase-1 and hbase-2 (#4008) (#4011)

[hu...@apache.org]

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huaxiangsun pushed a commit to branch branch-2.5
in repository https://gitbox.apache.org/repos/asf/hbase.git


The following commit(s) were added to refs/heads/branch-2.5 by this push:
     new a6b0e2d  HBASE-26590 Hbase-client Meta lookup performance regression between hbase-1 and hbase-2 (#4008) (#4011)
a6b0e2d is described below

commit a6b0e2dc85f9cd754494a5158dfde975972515b0
Author: huaxiangsun <hu...@apache.org>
AuthorDate: Thu Jan 6 11:54:53 2022 -0800

    HBASE-26590 Hbase-client Meta lookup performance regression between hbase-1 and hbase-2 (#4008) (#4011)
    
    Change scan caching back to 1 to avoid extra work at Region Server side. For most cases, the extra 4 results
    fetched are wasted at the client side.
    
    Signed-off-by: Duo Zhang <zh...@apache.org>
---
 .../java/org/apache/hadoop/hbase/client/ConnectionImplementation.java   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java
index 46863af..5fec87e 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java
@@ -912,7 +912,7 @@ class ConnectionImplementation implements ClusterConnection, Closeable {
     byte[] metaStopKey =
       RegionInfo.createRegionName(tableName, HConstants.EMPTY_START_ROW, "", false);
     Scan s = new Scan().withStartRow(metaStartKey).withStopRow(metaStopKey, true)
-      .addFamily(HConstants.CATALOG_FAMILY).setReversed(true).setCaching(5)
+      .addFamily(HConstants.CATALOG_FAMILY).setReversed(true).setCaching(1)
       .setReadType(ReadType.PREAD);
 
     switch (this.metaReplicaMode) {