kubernetes planned extension (Node Readiness Gate) Useful links CNI beta RFC Istio CNI Race Condition Mitigation CNI beta Graduation Kubernets Node Readiness Gates Q&A @tetrateio Tetrate https://tetrate.io

Europe) • runtime/standards (OCI) • immutability of images • all containers share a kernel (mitigation: Firecracker) • gotchas: unnecessary privileged users, no scans, trust • code analysis • source

type of length-tuning pattern (single-track length, differential-pair length, and differential-pair skew). These defaults can be overridden in 17 the properties of each tuning pattern added to the board section below. Tune length: These tools allow you to tune the length of single tracks or the length or skew of differential pairs, after they have been routed. See the Routing Tracks section for details. routing functions: Route Single Track, Route Differential Pair, Tune length of a single track, and Tune skew of a differential pair. All of these are present in both the Route menu dropdown (individually) on

SUM(balance) FROM accounts;
 SI: Bank Test SI: Bank Test •Write skew is valid in Snapshot Isolation •Solution? •SELECT FOR UPDATE 
 SI … Write skew? •Append unique numbers to key 0 and key 1 •Example: val FROM tb WHERE id = 0; •UPDATE tb SET val = "1,3,5,6,7" WHERE id = 1; 
 Write skew: Append Test Write skew w/o read-lock T1 {:f :txn, :value [[:append 0 28] [:r 1 [1 3 7 5 6 11 6} Write skew w/o read-lock •Append unique numbers to key 0 and key 1 •Example: •SELECT val FROM tb WHERE id = 0 FOR UPDATE; •UPDATE tb SET val = "1,3,5,6,7" WHERE id = 1; 
 Write skew gone w/ read-lock

= 30的事件时间窗口将被关闭并计算。 因此，您应该在应用程序中对事件时间敏感的operators(如流程函数和窗口)上监控watermarks。如果当前处理 时间与被称为 even-time skew的watermarks之间的差异非常高，那么它通常意味着可能会出现两种情况。首 先，它可能意味着您只是在处理旧的事件，例如在停机后的追赶期间，或者当您的工作无法继续，而事件正在 排队时。其次，它可 state are very application-specific. Typically, an increasing number of keys, a large event-time skew between different input streams or simply missing state cleanup may cause growing state. • NonHeap after recovering from a downtime. During this time you will see a much higher latency (event-time skew) than usual. A sudden increase in the CPU load might also be attributed to high garbage collection

section below. Tune length: These tools allow you to tune the length of single tracks or the length or skew of differential pairs, after they have been routed. See the Routing Tracks section for details. differential pair. The differential pair skew tuning tool (icon or hotkey ) will add length to the shorter member of a differential pair in order to eliminate skew (phase difference) between the positive min/opt/max Checks the clearance between objects on silkscreen layers and other objects. skew max Checks the total skew for the nets that match the rule condition, that is, the difference between the length

DESC; 在 gp_toolkit 中有可用于查看表倾斜情况的视图，虽然编者从来不用这些视图， 但还是有必要介绍一下，后续编者将介绍更高效的实现方案。  gp_toolkit.gp_skew_coefficients视图，一个非常复杂的视图，经过编者 了解，该视图最终会针对每张表分为AO表和非AO表来分别计算记录数情况，AO表 会通过get_ao_distribution函数来计算记 值再乘以100来表示倾斜的严重程度，值越大倾斜越严重。  gp_toolkit.gp_skew_idle_fractions视图，一个非常复杂的视图，经过编 者了解，该视图，会计算Instance中记录数的最大值与平均值的差值，然后除以 最大值，得到一个不大于1的浮点数，值越大倾斜越严重。不过，在获取表的信息 时与gp_toolkit.gp_skew_coefficients视图是一模一样的，所以，没有性 能优势。 Name", max(c) AS "Max Seg Rows", min(c) AS "Min Seg Rows", (max(c)-min(c))*100.0/max(c) AS "Skew Ratio" FROM (SELECT count(*) c, gp_segment_id FROM facts GROUP BY 2) AS a; 这个SQL有分母为0的风险，而

section below. Tune length: These tools allow you to tune the length of single tracks or the length or skew of differential pairs, after they have been routed. See the Routing Tracks section for details. min/opt/max Checks the clearance between objects on silkscreen layers and other objects. skew max Checks the total skew for the nets that match the rule condition, that is, the difference between the length

NetworkChaos: delay / lose / dup / partition / … ● IOChaos: latency / fault / … ● TimeChaos: clock skew ● KernelChaos: kernel fault injection ● StressChaos: burn cpu and memory ● DNSChaos …. ● Controller

NetworkChaos: delay / lose / dup / partition / … ● IOChaos: latency / fault / … ● TimeChaos: clock skew ● KernelChaos: kernel fault injection ● StressChaos: burn cpu and memory ● DNSChaos …. Dashboard