[hbase] branch branch-2.3 updated: HBASE-26590 Hbase-client Meta lookup performance regression between hbase-1 and hbase-2 (#4008) (#4013)

[hu...@apache.org]

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huaxiangsun pushed a commit to branch branch-2.3
in repository https://gitbox.apache.org/repos/asf/hbase.git


The following commit(s) were added to refs/heads/branch-2.3 by this push:
     new 7fcbf62  HBASE-26590 Hbase-client Meta lookup performance regression between hbase-1 and hbase-2 (#4008) (#4013)
7fcbf62 is described below

commit 7fcbf62403b54d5efc64803031baafbcfcf9558a
Author: huaxiangsun <hu...@apache.org>
AuthorDate: Thu Jan 6 11:56:07 2022 -0800

    HBASE-26590 Hbase-client Meta lookup performance regression between hbase-1 and hbase-2 (#4008) (#4013)
    
    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 2b28642..e980614 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
@@ -849,7 +849,7 @@ 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);
     if (this.useMetaReplicas) {
       s.setConsistency(Consistency.TIMELINE);