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From: Michael P. <mic...@us...> - 2011-07-14 05:05:38
|
Project "Postgres-XC".
The branch, master has been updated
via fb2a3a864dee367f2cfe76a3a4fff5e02cb94fc1 (commit)
from f0f4ae5fddf646b1a41dd4d512fccdf9c9587254 (commit)
- Log -----------------------------------------------------------------
commit fb2a3a864dee367f2cfe76a3a4fff5e02cb94fc1
Author: Michael P <mic...@us...>
Date: Thu Jul 14 13:56:00 2011 +0900
Performance issue with snapshot processing
This commit solves an issue with snapshot processing in the case
where cluster was used under multiple Coordinators.
When a Coordinator/Coordinator connection was initialized,
backend coordinator initialized a transaction to GTM that was never
committed. A consequence of that was Snapshot xmin that remained
to a constant value. Another consequence was recent global Xmin
value set to a lower value, making autovacuum having absolutely no effects.
This fix improves performance of the whole cluster by making autovacuum
remove correctly old tuples for long-period runs.
diff --git a/src/backend/access/transam/varsup.c b/src/backend/access/transam/varsup.c
index a5ff753..1c684f5 100644
--- a/src/backend/access/transam/varsup.c
+++ b/src/backend/access/transam/varsup.c
@@ -203,7 +203,8 @@ GetNewTransactionId(bool isSubXact)
increment_xid = false;
elog(DEBUG1, "xid (%d) does not follow ShmemVariableCache->nextXid (%d)",
xid, ShmemVariableCache->nextXid);
- } else
+ }
+ else
ShmemVariableCache->nextXid = xid;
}
else
diff --git a/src/backend/storage/ipc/procarray.c b/src/backend/storage/ipc/procarray.c
index 2de6db4..5477df6 100644
--- a/src/backend/storage/ipc/procarray.c
+++ b/src/backend/storage/ipc/procarray.c
@@ -1234,7 +1234,8 @@ GetSnapshotData(Snapshot snapshot)
if (GetSnapshotDataDataNode(snapshot))
return snapshot;
/* else fallthrough */
- } else if (IS_PGXC_COORDINATOR && !IsConnFromCoord())
+ }
+ else if (IS_PGXC_COORDINATOR && !IsConnFromCoord() && IsNormalProcessingMode())
{
/* Snapshot has ever been received from remote Coordinator */
if (GetSnapshotDataCoordinator(snapshot))
diff --git a/src/gtm/main/gtm_txn.c b/src/gtm/main/gtm_txn.c
index 7d13076..37b40a6 100644
--- a/src/gtm/main/gtm_txn.c
+++ b/src/gtm/main/gtm_txn.c
@@ -1363,7 +1363,7 @@ ProcessCommitTransactionCommand(Port *myport, StringInfo message)
pq_getmsgend(message);
oldContext = MemoryContextSwitchTo(TopMemoryContext);
-
+
elog(LOG, "Committing transaction id %u", gxid);
/*
@@ -1455,6 +1455,8 @@ ProcessCommitPreparedTransactionCommand(Port *myport, StringInfo message)
oldContext = MemoryContextSwitchTo(TopMemoryContext);
+ elog(LOG, "Committing: prepared id %u and commit prepared id %u ", gxid[0], gxid[1]);
+
/*
* Commit the prepared transaction.
*/
-----------------------------------------------------------------------
Summary of changes:
src/backend/access/transam/varsup.c | 3 ++-
src/backend/storage/ipc/procarray.c | 3 ++-
src/gtm/main/gtm_txn.c | 4 +++-
3 files changed, 7 insertions(+), 3 deletions(-)
hooks/post-receive
--
Postgres-XC
|
|
From: Michael P. <mic...@us...> - 2011-07-14 05:04:47
|
Project "Postgres-XC".
The branch, REL0_9_5_STABLE has been updated
via 694253102c045e2fc3d145d6718b81b5977004b3 (commit)
from e992f2cb8debeca4123d3137e48949071342c5c0 (commit)
- Log -----------------------------------------------------------------
commit 694253102c045e2fc3d145d6718b81b5977004b3
Author: Michael P <mic...@us...>
Date: Thu Jul 14 13:56:00 2011 +0900
Performance issue with snapshot processing
This commit solves an issue with snapshot processing in the case
where cluster was used under multiple Coordinators.
When a Coordinator/Coordinator connection was initialized,
backend coordinator initialized a transaction to GTM that was never
committed. A consequence of that was Snapshot xmin that remained
to a constant value. Another consequence was recent global Xmin
value set to a lower value, making autovacuum having absolutely no effects.
This fix improves performance of the whole cluster by making autovacuum
remove correctly old tuples for long-period runs.
diff --git a/src/backend/access/transam/varsup.c b/src/backend/access/transam/varsup.c
index 4bd8003..cdef834 100644
--- a/src/backend/access/transam/varsup.c
+++ b/src/backend/access/transam/varsup.c
@@ -203,7 +203,8 @@ GetNewTransactionId(bool isSubXact)
increment_xid = false;
elog(DEBUG1, "xid (%d) does not follow ShmemVariableCache->nextXid (%d)",
xid, ShmemVariableCache->nextXid);
- } else
+ }
+ else
ShmemVariableCache->nextXid = xid;
}
else
diff --git a/src/backend/storage/ipc/procarray.c b/src/backend/storage/ipc/procarray.c
index 741f658..d307b42 100644
--- a/src/backend/storage/ipc/procarray.c
+++ b/src/backend/storage/ipc/procarray.c
@@ -1227,7 +1227,8 @@ GetSnapshotData(Snapshot snapshot)
if (GetSnapshotDataDataNode(snapshot))
return snapshot;
/* else fallthrough */
- } else if (IS_PGXC_COORDINATOR && !IsConnFromCoord())
+ }
+ else if (IS_PGXC_COORDINATOR && !IsConnFromCoord() && IsNormalProcessingMode())
{
/* Snapshot has ever been received from remote Coordinator */
if (GetSnapshotDataCoordinator(snapshot))
diff --git a/src/gtm/main/gtm_txn.c b/src/gtm/main/gtm_txn.c
index 7d13076..37b40a6 100644
--- a/src/gtm/main/gtm_txn.c
+++ b/src/gtm/main/gtm_txn.c
@@ -1363,7 +1363,7 @@ ProcessCommitTransactionCommand(Port *myport, StringInfo message)
pq_getmsgend(message);
oldContext = MemoryContextSwitchTo(TopMemoryContext);
-
+
elog(LOG, "Committing transaction id %u", gxid);
/*
@@ -1455,6 +1455,8 @@ ProcessCommitPreparedTransactionCommand(Port *myport, StringInfo message)
oldContext = MemoryContextSwitchTo(TopMemoryContext);
+ elog(LOG, "Committing: prepared id %u and commit prepared id %u ", gxid[0], gxid[1]);
+
/*
* Commit the prepared transaction.
*/
-----------------------------------------------------------------------
Summary of changes:
src/backend/access/transam/varsup.c | 3 ++-
src/backend/storage/ipc/procarray.c | 3 ++-
src/gtm/main/gtm_txn.c | 4 +++-
3 files changed, 7 insertions(+), 3 deletions(-)
hooks/post-receive
--
Postgres-XC
|
