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From 4448795af501355f3893aed05551ee62551e8438 Mon Sep 17 00:00:00 2001
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From: Milind Changire <mchangir@redhat.com>
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Date: Fri, 13 Apr 2018 14:51:32 +0530
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Subject: [PATCH 256/260] rpc: set listen-backlog to high value
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Problem:
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On node reboot, when glusterd starts volumes rapidly, there's a flood of
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connections from the bricks to glusterd and from the self-heal daemons
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to the bricks. This causes SYN Flooding and dropped connections when the
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listen-backlog is not enough to hold the pending connections to
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compensate for the rate at which connections are accepted by the RPC
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layer.
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Solution:
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Increase the listen-backlog value to 1024. This is a partial solution.
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Part of the solution is to rearm the listener socket early for quicker
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accept() of connections.
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See commit 6964640a977cb10c0c95a94e03c229918fa6eca8 (change 19833)
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mainline:
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> Reviewed-on: https://review.gluster.org/19836
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> Change-Id: I56781149919dd6e18cc43884234c6f60f2c93f88
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> fixes: bz#1564600
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> Signed-off-by: Milind Changire <mchangir@redhat.com>
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Change-Id: I1d7ac940eb5410cdbf7508a24bfdfc052b35170b
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BUG: 1563804
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Signed-off-by: Milind Changire <mchangir@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/135557
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Raghavendra Gowdappa <rgowdapp@redhat.com>
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Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
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---
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rpc/rpc-transport/socket/src/socket.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/rpc/rpc-transport/socket/src/socket.c b/rpc/rpc-transport/socket/src/socket.c
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index 157b5b7..a6be911 100644
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--- a/rpc/rpc-transport/socket/src/socket.c
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+++ b/rpc/rpc-transport/socket/src/socket.c
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@@ -4613,6 +4613,13 @@ struct volume_options options[] = {
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.min = GF_MIN_SOCKET_WINDOW_SIZE,
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.max = GF_MAX_SOCKET_WINDOW_SIZE
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},
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+ { .key = {"transport.listen-backlog"},
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+ .type = GF_OPTION_TYPE_SIZET,
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+ .description = "This option uses the value of backlog argument that "
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+ "defines the maximum length to which the queue of "
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+ "pending connections for socket fd may grow.",
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+ .default_value = "1024",
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+ },
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{ .key = {"transport.tcp-user-timeout"},
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.type = GF_OPTION_TYPE_INT,
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.default_value = "0"
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--
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1.8.3.1
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